![\"\"](\"http:\/\/multimediabilgisayar.com\/blog\/wp-content\/uploads\/2023\/02\/flash-ssd-300x210.png\")
<\/p>\n<\/p>\n
\u00a0SSD, hacker tehdidi alt\u0131nda m\u0131?<\/strong><\/h2>\nBug\u00fcn \u00fcretilen\u00a0SSD<\/strong>‘lerin b\u00fcy\u00fck bir \u00e7o\u011funlu\u011fu kamera ve MP3 \u00e7alarlar i\u00e7in geli\u015ftirilen\u00a0NAND flash<\/strong>\u00a0\u00e7iplerini kullan\u0131yor. Hal b\u00f6yle olunca, bir\u00a0hacker<\/strong>, flash \u00e7ip programc\u0131s\u0131 kullanan verileri okuyan NAND \u00e7iplerinin kullan\u0131ld\u0131\u011f\u0131 SSD’leri kolayca hackleyebiliyor. Veriler bir kez okundu\u011funda, dosyalar veri kurtarma yaz\u0131l\u0131mlar\u0131yla yeniden ele ge\u00e7irilebiliyor.\u00a0Objective Analysis<\/strong>‘in direkt\u00f6r\u00fc olan\u00a0Jim Handy<\/strong>‘e g\u00f6re verileri bu \u015fekilde hacker’lar\u0131n ele ge\u00e7irmesinin \u00f6n\u00fcnde hi\u00e7bir zorluk yok. Bu gibi tehditlere kar\u015f\u0131 acil \u00f6nlemlerin al\u0131nmas\u0131 gerekti\u011fini vurgulayan pazarlama m\u00fcd\u00fcr\u00fc\u00a0Craig Rawlings<\/strong>, \u015fifreleme anahtarlar\u0131n\u0131n SSD’lere eklenmesiyle\u00a0hacker’lar\u0131n i\u015finin daha da zorla\u015faca\u011f\u0131 g\u00f6r\u00fc\u015f\u00fcnde. Safend<\/strong>\u00a0ve\u00a0Encryptx<\/strong>‘in de i\u00e7erisinde oldu\u011fu bir\u00e7ok \u015firketin SSD’lerin de aralar\u0131nda bulundu\u011fu depolama ayg\u0131tlar\u0131nda verileri \u015fifreleyen \u00fcr\u00fcnlerinin oldu\u011fu biliniyor.<\/p>\n <\/p>\n
\u00a0SSD’lerde \u015fifrelemenin \u00f6nemi<\/h2>\n
<\/p>\n
![\"\"](\"http:\/\/multimediabilgisayar.com\/blog\/wp-content\/uploads\/2023\/02\/ssd-disk-300x225.png\")
\u015eifrelemenin bir di\u011fer faydas\u0131 ise SSD<\/strong>‘lerin \u00fczerinde yer alan verilerin daha kolay bir \u015fekilde silinebilmesini sa\u011flamas\u0131.\u00a0iFixlt<\/strong>‘in CEO’su\u00a0Kyle Wiens<\/strong>‘e g\u00f6re\u00a0HDD<\/strong>‘lerde oldu\u011fu gibi, SSD’ler de bir\u00e7ok dosya kopyas\u0131 olu\u015fturuyor, ancak \u015fifreleme yaz\u0131l\u0131m\u0131 bu g\u00fcvenli dosyalar\u0131n silinebilmesine yard\u0131mc\u0131 oluyor. Sonu\u00e7 olarak HDD’lere g\u00f6re SSD’lerin \u00fczerindeki verilerin silinebilmesinin daha kolay oldu\u011fu a\u00e7\u0131k. Veriler, SSD i\u00e7indeki elektronlar\u0131n \u00fczerine depolan\u0131yor. HDD’lerde ise durum daha farkl\u0131: Verilerin silinebilmesi i\u00e7in \u00fczerine yeni bir veri giri\u015finin yap\u0131lmas\u0131 gerekiyor ya da fiziksel olarak zarar g\u00f6rmesiyle verilerin\u00a0tamamen<\/strong>\u00a0ortadan kalkabilmesi m\u00fcmk\u00fcn. SSD’deki verilerin kolay siliniyor olmas\u0131n\u0131n\u00a0en olumsuz yan\u0131<\/strong>\u00a0ise dikkatsizlikten kaynaklanan hatalarla verilerin kolayca kaybedilebilmesi ve elbette tekrar kurtar\u0131lamamas\u0131.<\/p>\n\u00a0<\/h2>\nSolid State Diskler (SSD) \u00dczerlerine Kaydedilen Verileri Hi\u00e7bir Zaman Silmiyor<\/strong><\/h2>\nGeleneksel sabit disklerin (HDD) yerine performans\u0131 a\u00e7\u0131s\u0131ndan \u00f6n planda olan SSD\u2018ler (Solid State Diskler) yani kat\u0131 hal diskleri, veri depolamak i\u00e7in mekanik disklerdeki manyetlik kay\u0131t ortam\u0131n\u0131n yerini alan bir veri depolama \u00e7\u00f6z\u00fcm\u00fcd\u00fcr. Bu s\u00fcr\u00fcc\u00fcler, hareketli manyetik disklerin bulundu\u011fu sabit disklere oranla daha d\u00fc\u015f\u00fck g\u00fc\u00e7 t\u00fcketimi, y\u00fcksek dayan\u0131kl\u0131l\u0131k, hafiflik ve etkili performans gibi \u00f6zelliklere sahiptir. Fiyatlar\u0131n\u0131n d\u00fc\u015fmeye ba\u015flamas\u0131yla laptoplar ba\u015fta olmak \u00fczere bir\u00e7ok cihazda kullan\u0131lmaya ba\u015flanan SSD disklerin \u00fczerlerine kaydedilen verileri silmemek gibi \u00e7ok tehlikeli bir yan etkisi de var.<\/strong><\/p>\nNAND flash tabanl\u0131 ve Samsung taraf\u0131ndan geli\u015ftirilmi\u015f bu yeni nesil depolama \u00e7\u00f6z\u00fcm\u00fc SSD\u2019ler hali haz\u0131rda kullan\u0131lan hard disklere k\u0131yasla \u00e7ok daha h\u0131zl\u0131lar, mekanik par\u00e7a bulundurmad\u0131klar\u0131 i\u00e7in d\u0131\u015f etkilere kar\u015f\u0131 daha dayan\u0131kl\u0131lar, ilk a\u00e7\u0131l\u0131\u015f ve eri\u015fim h\u0131zlar\u0131 daha y\u00fcksek ve de ar\u0131za yapma olas\u0131l\u0131klar\u0131 daha d\u00fc\u015f\u00fckt\u00fcr. Ama SSD\u2019lerin b\u00fct\u00fcn bu avantajlar\u0131na ra\u011fmen \u00fczerine kaydedilmi\u015f veriler silinmeye niyetlendi\u011finde bunlar\u0131 hi\u00e7bir \u015fekilde silmemeleri en b\u00fcy\u00fck dezavantaj\u0131d\u0131r. Bu sorun \u00fczerine en kapsaml\u0131 \u00e7al\u0131\u015fmas\u0131 birka\u00e7 y\u0131l \u00f6nce UC San Diego \u00dcniversitesi ara\u015ft\u0131rmac\u0131lar\u0131 taraf\u0131ndan yap\u0131lan testler sonucunda ortaya \u00e7\u0131km\u0131\u015f ve geleneksel sabit diskler i\u00e7in kullan\u0131lan veri temizleme i\u015flemelerinin yeni nesil depolama ayg\u0131t\u0131 olan SSD\u2019lerde hi\u00e7bir i\u015fe yaramad\u0131\u011f\u0131 tespit edilmi\u015fti. ![\"\"](\"http:\/\/multimediabilgisayar.com\/blog\/wp-content\/uploads\/2023\/02\/6-e1677585657478.jpg\")
<\/p>\n
SSD\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 HDD<\/strong><\/p>\nSSD\u2019lerde veri depolama i\u015flemi HDD\u2019lerde oldu\u011fu gibi manyetik plakalar \u00fczerine yazmak yerine, i\u00e7erisindeki kontrolc\u00fcler vas\u0131tas\u0131yla veriyi yazarken diskin farkl\u0131 b\u00f6lgelerindeki az ya da hi\u00e7 kullan\u0131lmam\u0131\u015f yerlerine y\u00f6nlendirilerek yap\u0131l\u0131r. Yani HDD\u2019lerde oldu\u011fu gibi verilerin s\u00fcr\u00fcc\u00fcde nereye yaz\u0131laca\u011f\u0131na bilgisayar de\u011fil, diskteki kontrolc\u00fc elemanlar karar verir. Bu y\u00fczden veriler tek tek silinmek yerine ancak k\u00fcmeler halinde silinebilir. Silme i\u015flemi de uzun s\u00fcrd\u00fc\u011f\u00fcnden bitlik veriler i\u00e7in bile t\u00fcm k\u00fcme okunur, \u00fczerinde de\u011fi\u015fiklik yap\u0131l\u0131r ve yeniden yaz\u0131l\u0131r. Eski bilginin bulundu\u011fu alan sonradan silinmek \u00fczere i\u015faretlenip \u00f6ylece b\u0131rak\u0131l\u0131r. \u0130\u015fte bundan \u00f6t\u00fcr\u00fc ara\u015ft\u0131rmac\u0131lar sabit diskler \u00fczerinde veri silinmesinde en etkili y\u00f6ntemler olan Gutmann (35 kez), NSA (7 kez) ve Us DoD 5220.22-M (3 kez) gibi methodlar\u0131 denediklerinde bile SSD\u2019lerde ba\u015far\u0131l\u0131 olamam\u0131\u015flar, aksine \u00f6nemli miktarda verinin hala disk \u00fczerinde kald\u0131\u011f\u0131n\u0131 tespit etmi\u015flerdir: SSD-veri-silme-kurtarma Ara\u015ft\u0131rmac\u0131lar 1000 MB\u2019l\u0131k verinin silinip geri getirilmesi testinde (yukar\u0131daki grafik) baz\u0131 \u00f6zel silme y\u00f6ntemlerinin hi\u00e7 ba\u015far\u0131l\u0131 olamad\u0131\u011f\u0131n\u0131, \u00e7ok g\u00fcvenilen tekniklerin ise maalesef HDD\u2019lerde sergiledikleri ba\u015far\u0131y\u0131 SSD\u2019lerde g\u00f6stermediklerini ortaya koydular. Bu durum da, ticari s\u0131r sahibi \u015firketler veya hassas nitelikte veri ta\u015f\u0131yan devlet kurumlar\u0131 i\u00e7in \u00e7ok ciddi problem te\u015fkil edebilir. Bu veriler \u0131\u015f\u0131\u011f\u0131nda hassas ve g\u00fcvenlik verilerinin asla SSD diskler \u00fczerinde ta\u015f\u0131nmamas\u0131 gerekir. E\u011fer bu diskler kullanacaksa da, disklerle olan i\u015f bittikten sonra verileri temizlemek i\u00e7in k\u0131rma, par\u00e7alama ve yakma gibi fiziksel yollar\u0131 kullanmak daha g\u00fcvenilirdir.<\/p>\n
<\/p>\n
Dayan\u0131m ve G\u00fcvenilirlik\u00a0 \u00d6zellikleri<\/h1>\n
Flash dayan\u0131m \u00f6zellikleri, bir SSD\u2019nin \u00f6mr\u00fcn\u00fc \u201ctahmin etmeye\u201d yard\u0131mc\u0131 olabilir. Dayan\u0131m tipik olarak a\u015fa\u011f\u0131daki \u015fekillerde \u00f6l\u00e7\u00fcl\u00fcr:<\/p>\n
\n- TBW ya da terabytes written;\u00a0Toplam Yaz\u0131labilir Bayt<\/strong>\u00a0SSD s\u00fcr\u00fcc\u00fcn\u00fcn kullan\u0131m \u00f6mr\u00fc boyunca yaz\u0131labilecek veri miktar\u0131n\u0131 belirtir. TBW \u015fu \u015fekilde hesaplan\u0131r: DWPD x Y\u0131l Olarak Garanti S\u00fcresi x 365 x Gigabayt olarak Kapasite \/ 1024 = TBW<\/li>\n<\/ul>\n
\u00d6rne\u011fin DWPD de\u011feri 1,3 kapasitesi 1TB ve garanti s\u00fcresi 3 y\u0131l olan bir\u00a02,5 in\u00e7 SATA SSD\u00a0s\u00fcr\u00fcc\u00fc i\u00e7in TBW de\u011feri : 1,3 x 3 x 365 x 1024 \/ 1024 = 1423,5 yani yakla\u015f\u0131k 1450TB\u2019 dir.<\/p>\n
\n- DWPD ya da drive writes per day;\u00a0G\u00fcnl\u00fck Yaz\u0131labilir Veri Miktar\u0131,\u00a0<\/strong>SSD s\u00fcr\u00fcc\u00fcn\u00fcn garanti s\u00fcresi boyunca, her g\u00fcn s\u00fcr\u00fcc\u00fcn\u00fcn tamam\u0131na ka\u00e7 kez veri yaz\u0131labilece\u011fini belirtir. DWPD \u015fu \u015fekilde hesaplan\u0131r : (TBW x 1024) \/ ( Y\u0131l Olarak Garanti S\u00fcresi x 365 x Gigabayt olarak Kapasite) = DWPD<\/li>\n<\/ul>\n
Yukar\u0131daki \u00f6rne\u011fi uyarlayarak;\u00a0 TBW de\u011feri 1450TB, kapasitesi 1TB ve garanti s\u00fcresi 3 y\u0131l olan bir 2,5 in\u00e7 SATA SSD s\u00fcr\u00fcc\u00fc i\u00e7in DWPD de\u011feri : (1450 x 1024) \/ (1024 x 3 x 365) =1,3 Bunun anlam\u0131, garanti s\u00fcresi boyunca 1TB kapasiteli s\u00fcr\u00fcc\u00fcye her g\u00fcn kapasitesinin 1,3 kat\u0131 yani 1,3TB veri yaz\u0131labilir.<\/p>\n
\n- Program\/Erase Cycle;\u00a0Program\/Silme (P\/E) D\u00f6ng\u00fcs\u00fc<\/strong>\u00a0NAND depolama biriminde ger\u00e7ekle\u015fen P\/E d\u00f6ng\u00fcs\u00fc ile SSD s\u00fcr\u00fcc\u00fcn\u00fcn \u00f6mr\u00fcn\u00fc etkiler. Blok \u00fczerinde ger\u00e7ekle\u015fen her bir yazma ve silme i\u015flemi bir d\u00f6ng\u00fc demektir. D\u00f6ng\u00fc say\u0131s\u0131n\u0131n \u00f6nemli olmas\u0131n\u0131n sebebi; blok \u00fczerinde s\u0131n\u0131rl\u0131 say\u0131da yazma i\u015flemi yap\u0131labilmesidir. Bu de\u011fer a\u015f\u0131ld\u0131\u011f\u0131nda blok \u00fczerine veri yaz\u0131lamaz.<\/li>\n<\/ul>\n
SSD \u00fcreticileri s\u00fcr\u00fcc\u00fc \u00f6mr\u00fcn\u00fc uzatmak i\u00e7in \u00e7e\u015fitli\u00a0mekanizmalar\u00a0geli\u015ftirmi\u015flerdir. \u00d6rne\u011fin Advanced Wear Leveling, bloklar\u0131n her birinin e\u015fit \u015fekilde yazma silme i\u015flemi yap\u0131lmas\u0131n\u0131 sa\u011flayarak yo\u011fun kullan\u0131lan bloklar\u0131n k\u0131sa s\u00fcrede kullan\u0131lmaz hale gelmesini \u00f6nler. A\u015f\u0131nma E\u015fitleme olarak \u00e7evrilebilecek\u00a0Wear leveling<\/em>\u00a0i\u015flevi ile SSD depolama cihaz\u0131n\u0131n kullan\u0131m \u00f6mr\u00fcn\u00fcn uzamas\u0131 sa\u011flan\u0131r.<\/p>\n\n- MTBF ya da mean time between failures,\u00a0Ar\u0131zalar Aras\u0131 Ortalama S\u00fcre<\/strong>; depolama cihaz\u0131n\u0131n ar\u0131za vermeden \u00e7al\u0131\u015fabilece\u011fi ortalama s\u00fcre olarak hesaplanm\u0131\u015ft\u0131r. Saat olarak ifade edilir ve de\u011fer ne kadar y\u00fcksek ise depolama cihaz\u0131n\u0131n o kadar g\u00fcvenli oldu\u011funu g\u00f6sterir. MTBF de\u011feri 1.500.000 olan bir SSD s\u00fcr\u00fcc\u00fcn\u00fcn g\u00fcnde 24 saat \u00e7al\u0131\u015ft\u0131\u011f\u0131nda 170 y\u0131l boyunca hatas\u0131z \u015fekilde \u00e7al\u0131\u015fabilece\u011fi s\u00f6ylenebilir.<\/li>\n
- Data Retention \u2013\u00a0Veri Saklama;<\/strong>\u00a0depolama cihaz\u0131n\u0131n veriyi bozulmadan saklayabilece\u011fi s\u00fcreyi ifade eder. \u00d6rne\u011fin e\u011fer s\u00fcr\u00fcc\u00fc \u00f6zelliklerinde\u00a0 \u201c%15 P\/E,\u00a0 55 \u00b0C\u2019de 5 Y\u0131l\u201d \u015feklinde bir ifade mevcut ise; bu s\u00fcr\u00fcc\u00fcn\u00fcn %15 Program\/Silme P\/E D\u00f6ng\u00fcs\u00fc sonras\u0131nda kapat\u0131l\u0131p 55 \u00b0C s\u0131cakl\u0131\u011f\u0131nda bir ortamda depolanmas\u0131 halinde i\u00e7erisindeki veriyi bozulmadan 5 y\u0131l boyunca saklayabilece\u011fi garanti edilmektedir.<\/li>\n<\/ul>\n
Is\u0131l \u00d6zellikler<\/h2>\n
\u00c7al\u0131\u015fma s\u0131cakl\u0131\u011f\u0131 bir s\u00fcr\u00fcc\u00fcn\u00fcn, i\u015f y\u00fck\u00fc, i\u015flevler, uygulamalar ve \u00e7evresel \u015fartlara ba\u011fl\u0131 olarak etkin bir \u015fekilde \u00e7al\u0131\u015fabilece\u011fi s\u0131cakl\u0131k de\u011ferini ifade eder. SSD s\u00fcr\u00fcc\u00fcler genel olarak a\u015fa\u011f\u0131daki gibi \u00fc\u00e7 s\u0131cakl\u0131k seviyesine g\u00f6re s\u0131n\u0131fland\u0131r\u0131l\u0131rlar.<\/p>\n
\n\n\n\nTicari<\/strong><\/p>\n<\/td>\n\nEnd\u00fcstriyel<\/strong><\/p>\n<\/td>\n\nAskeri<\/strong><\/p>\n<\/td>\n<\/tr>\n\n\n0\u00b0 ile 70\u00b0C aras\u0131<\/p>\n<\/td>\n
\n-40\u00b0 ile 85\u00b0C aras\u0131<\/p>\n<\/td>\n
\n-55\u00b0 ile 125\u00b0C aras\u0131<\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
Performans \u00d6zellikleri<\/h2>\n
Depolama performans\u0131; SSD s\u00fcr\u00fcc\u00fcn\u00fcn veriye eri\u015firken, i\u015flerken ya da kaydederken i\u015flevlerinin ne kadar iyi \u00e7al\u0131\u015ft\u0131\u011f\u0131n\u0131 belirtir. Okuma \u2013 Yazma H\u0131zlar\u0131; bir dosyay\u0131 a\u00e7man\u0131n yani veriyi okuman\u0131n ya da dosyay\u0131 kaydetmenin yani veriyi yazman\u0131n belirli bir s\u00fcre i\u00e7erisinde ne kadar s\u00fcrd\u00fc\u011f\u00fcn\u00fc \u00f6l\u00e7er. Genelikle saniyede ger\u00e7ekle\u015fen iki farkl\u0131 h\u0131z t\u00fcr\u00fc \u00f6l\u00e7\u00fcmler i\u00e7in kullan\u0131lmaktad\u0131r.<\/p>\n
\n- Sequential read\/write\u00a0Ard\u0131\u015f\u0131k\/S\u0131ral\u0131 okuma-yazma h\u0131z\u0131<\/strong>; SSD s\u00fcr\u00fcc\u00fcn\u00fcn b\u00fcy\u00fck boyutlu veri par\u00e7alar\u0131n\u0131n s\u00fcr\u00fcc\u00fcdeki belli bir alana hangi h\u0131zda yaz\u0131p okudu\u011funu \u00f6l\u00e7er. SSD s\u00fcr\u00fcc\u00fcler b\u00fcy\u00fck boyutlu tekil dosyalar\u0131 rastgele \u00e7ok k\u00fc\u00e7\u00fck boyutlu dosyalara g\u00f6re daha h\u0131zl\u0131 okuyup yazabilirler.<\/li>\n
- Random read\/write\u00a0Rastgele okuma-yazma h\u0131z\u0131;<\/strong>\u00a0SSD s\u00fcr\u00fcc\u00fcn\u00fcn k\u00fc\u00e7\u00fck boyutlu verileri (genelde 4KB) s\u00fcr\u00fcc\u00fcn\u00fcn rastgele alanlar\u0131na hangi h\u0131zda yaz\u0131p okudu\u011funu \u00f6l\u00e7er. Bu de\u011fer ger\u00e7ek kullan\u0131m senaryosuna daha uygun bir \u00f6l\u00e7\u00fcm \u015fekli olarak kabul edilir. 4KB rastgele okuma-yazma de\u011ferleri IOPS (Input\/Output Operations Per Second) yani saniyedeki girdi \u00e7\u0131kt\u0131 i\u015flemleri olarak g\u00f6sterilir.<\/li>\n<\/ul>\n
SNIA<\/strong>\u00a0(Storage Networking Industry Association) taraf\u0131ndan belirlenmi\u015f, her biri performans\u0131n farkl\u0131 bir boyutunu \u00f6l\u00e7en \u00fc\u00e7 temel \u00f6l\u00e7\u00fcm t\u00fcr\u00fc mevcuttur.<\/p>\n\n\n\n\n\u00d6l\u00e7\u00fcm<\/strong><\/p>\n<\/td>\n\nTan\u0131m<\/strong><\/p>\n<\/td>\n\nA\u00e7\u0131klama<\/strong><\/p>\n<\/td>\n<\/tr>\n\n\nIOPS<\/strong><\/p>\n<\/td>\n\n\n- Belirli bir zaman biriminde (saniye) ger\u00e7ekle\u015fen azami okuma yazma(aktar\u0131m) say\u0131s\u0131d\u0131r.<\/li>\n
- \u00dcr\u00fcn \u00f6zelliklerinde 4KB Rastgele Okuma-Yazma olarak ifade edilir.<\/li>\n<\/ul>\n<\/td>\n
\nY\u00fcksek de\u011fer daha iyidir.<\/p>\n<\/td>\n<\/tr>\n
\n\n\u00c7\u0131kt\u0131 Bant Geni\u015fli\u011fi <\/strong><\/p>\n<\/td>\n\n\n- Belirli bir zaman biriminde depolama birimine aktar\u0131lan ya da depolama biriminden aktar\u0131lan veri miktar\u0131 hacmini \u00f6l\u00e7er.<\/li>\n
- Saniyede aktar\u0131lan megabayt MB\/s ya da saniyede aktar\u0131lan gigabayt GB\/s \u015feklinde g\u00f6sterilir.<\/li>\n
- \u00dcr\u00fcn \u00f6zelliklerinde S\u0131ral\u0131\/Ard\u0131\u015f\u0131k Okuma-Yazma olarak ifade edilir.<\/li>\n<\/ul>\n<\/td>\n
\nY\u00fcksek de\u011fer daha iyidir.<\/p>\n<\/td>\n<\/tr>\n
\n\nGecikme\/Latency<\/strong><\/p>\n<\/td>\n\n\n- Veri aktar\u0131m\u0131n\u0131n ba\u015flamas\u0131 i\u00e7in ge\u00e7en s\u00fcreyi \u00f6l\u00e7er.<\/li>\n
- Milisaniye ya da mikrosaniye \u015feklinde g\u00f6sterilir.<\/li>\n<\/ul>\n<\/td>\n
\nD\u00fc\u015f\u00fck de\u011fer daha iyidir.<\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
\u00dcr\u00fcn \u00f6zelliklerinde en yayg\u0131n kullan\u0131lan \u00fc\u00e7 \u00f6l\u00e7\u00fcm tipi.<\/p>\n
Bu \u00d6l\u00e7\u00fcmler ne i\u015fe yarar?<\/h2>\n
\u0130nsanlar beklemekten hi\u00e7 ho\u015flanmaz. \u00d6zellikle hemen her \u015feye bir anda ula\u015f\u0131labildi\u011fi g\u00fcn\u00fcm\u00fczde, kullan\u0131c\u0131lar\u0131na h\u0131zl\u0131 yan\u0131t s\u00fcreleri sa\u011flayamayan i\u015fletmeler; memnuniyetsiz kullan\u0131c\u0131 ve m\u00fc\u015fteriler ile kar\u015f\u0131 kar\u015f\u0131ya kalacakt\u0131r. Pek \u00e7ok veri depolama altyap\u0131s\u0131nda, y\u00fcksek IOPS de\u011ferlerine b\u00fcy\u00fck \u00f6nem verilerek depolama performans\u0131n\u0131n art\u0131r\u0131lmas\u0131 daima birinci \u00f6nceliktir. IOPS, aktar\u0131m h\u0131z\u0131 ya da bant geni\u015fli\u011fi; depolama cihaz\u0131n\u0131n veri okuyabildi\u011fi ya da yazabildi\u011fi h\u0131z\u0131 farkl\u0131 \u015fekillerde g\u00f6steren de\u011ferlerdir. Her ikisi de ne t\u00fcr verilerin i\u015flendi\u011fine ba\u011fl\u0131 olarak \u00f6nemlidir.<\/p>\n
Videolar gibi b\u00fcy\u00fck boyutlu dosyalar ile \u00e7al\u0131\u015f\u0131rken y\u00fcksek aktar\u0131m h\u0131z\u0131 olan depolama birimleri, y\u00fcksek \u00e7\u00f6z\u00fcn\u00fcrl\u00fckl\u00fc i\u00e7erikleri i\u015flerken bekleme s\u00fcrelerinin k\u0131salmas\u0131n\u0131 sa\u011flar. \u00d6te yandan, \u00e7ok say\u0131da rastgele k\u00fc\u00e7\u00fck aktar\u0131m gerektiren veri taban\u0131 gibi\u00a0kurumsal\u00a0uygulamalar ile \u00e7al\u0131\u015f\u0131l\u0131yorsa IOPS de\u011feri y\u00fcksek olan depolama birimleri en iyi performans\u0131 sunacaklard\u0131r. Gecikme, IOPS ve aktar\u0131m h\u0131z\u0131 bilgilerini daha anla\u015f\u0131l\u0131r hale getirir. Gecikme de\u011feri, depolama biriminden bir istek yap\u0131lmas\u0131 ile bu iste\u011fin ger\u00e7ekle\u015ftirilmeye ba\u015flanmas\u0131 aras\u0131nda ge\u00e7en s\u00fcredir. D\u00fc\u015f\u00fck gecikme s\u00fcresi olan yani h\u0131zl\u0131 tepki vermek \u00fczere optimize edilmi\u015f depolama cihazlar\u0131 daha k\u0131sa bekleme s\u00fcreleri sunduklar\u0131 i\u00e7in kullan\u0131c\u0131ya daha belirgin h\u0131z hissi verir. I\/O yani girdi\/\u00e7\u0131kt\u0131 i\u015flemlerinin yo\u011fun oldu\u011fu i\u015f y\u00fcklerinde, e\u011fer gecikme y\u00fcksekse, k\u0131sa bile olsa \u00e7ok say\u0131da ger\u00e7ekle\u015fecek olan bekleme s\u00fcreleri kullan\u0131c\u0131 deneyimini olumsuz \u015fekilde etkiler. Farkl\u0131 SSD s\u00fcr\u00fcc\u00fcleri kar\u015f\u0131la\u015ft\u0131r\u0131rken \u00f6nemli olan de\u011ferleri en y\u00fcksek olan tercih etmek de\u011fildir. Kullan\u0131m amac\u0131na en uygun, potansiyel i\u015f y\u00fckleri i\u00e7in en do\u011fru \u00e7\u00f6z\u00fcm\u00fc tercih ederek en do\u011fru yat\u0131r\u0131m olacak \u00fcr\u00fcn\u00fc se\u00e7mektir.<\/p>\n
<\/p>\n
https:\/\/www.multiyazilim.com<\/div>\n","protected":false},"excerpt":{"rendered":"SSD’ler san\u0131ld\u0131\u011f\u0131 kadar g\u00fcvenli de\u011fil mi? Solid State Disk (SSD)‘ler g\u00fcn ge\u00e7tik\u00e7e kendilerine daha fazla yer buluyor ve\u00a0HDD‘ler yerini yava\u015f yava\u015f bu yeni ve h\u0131zl\u0131 disklere b\u0131rak\u0131yor. Bunun en a\u00e7\u0131k ispat\u0131 da\u00a0Intel\u00a0gibi b\u00fcy\u00fck \u015firketlerin de\u00a0SSD\u00a0pazar\u0131na girmesinde sakl\u0131 asl\u0131nda. SSD’lerin HDD’lere nazaran bu kadar\u00a0pop\u00fcler\u00a0olmas\u0131ndaki en \u00f6nemli fakt\u00f6r \u015f\u00fcphesiz bu ayg\u0131tlar\u0131n olduk\u00e7a h\u0131zl\u0131 olmas\u0131. \u00d6zellikle\u00a0laptoplarda\u00a0fark\u0131 rahat\u00e7a hissedilen […]<\/p>\n","protected":false},"author":1,"featured_media":4539,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[245],"tags":[],"class_list":["post-4536","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-donanim"],"yoast_head":"\n
SSD Disklerde Veri G\u00fcvenli\u011fi ve Ortalama \u00d6m\u00fcrleri - Multimedia Bilgisayar | Blog<\/title>\n<meta name=\"description\" content=\"SSD diskler g\u00fcvenli mi? SSD disklerdeki bigliler silinmiyor mu? SSD mi yoksa HDD mi daha guvenli? SSD disklerin ortalama \u00f6mr\u00fc ne kadar?\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/multimediabilgisayar.com\/blog\/ssd-disklerde-veri-guvenligi-ve-ortalama-omurleri\/\" \/>\n<meta property=\"og:locale\" content=\"tr_TR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"SSD Disklerde Veri G\u00fcvenli\u011fi ve Ortalama \u00d6m\u00fcrleri - Multimedia Bilgisayar | Blog\" \/>\n<meta property=\"og:description\" content=\"SSD diskler g\u00fcvenli mi? SSD disklerdeki bigliler silinmiyor mu? SSD mi yoksa HDD mi daha guvenli? 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SSD disklerin ortalama \u00f6mr\u00fc ne kadar?","og_url":"https:\/\/multimediabilgisayar.com\/blog\/ssd-disklerde-veri-guvenligi-ve-ortalama-omurleri\/","og_site_name":"Multimedia Bilgisayar | Blog","article_published_time":"2023-02-28T14:09:20+00:00","article_modified_time":"2024-11-06T10:59:19+00:00","og_image":[{"width":893,"height":527,"url":"https:\/\/multimediabilgisayar.com\/blog\/wp-content\/uploads\/2023\/02\/6-1.jpg","type":"image\/jpeg"}],"author":"Multimedia","twitter_card":"summary_large_image","twitter_misc":{"Yazan:":"Multimedia","Tahmini okuma s\u00fcresi":"12 dakika"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/multimediabilgisayar.com\/blog\/ssd-disklerde-veri-guvenligi-ve-ortalama-omurleri\/#article","isPartOf":{"@id":"https:\/\/multimediabilgisayar.com\/blog\/ssd-disklerde-veri-guvenligi-ve-ortalama-omurleri\/"},"author":{"name":"Multimedia","@id":"https:\/\/multimediabilgisayar.com\/blog\/#\/schema\/person\/75acd01e1e2de1d9d7b9c18ecfd81c90"},"headline":"SSD Disklerde Veri G\u00fcvenli\u011fi ve Ortalama \u00d6m\u00fcrleri","datePublished":"2023-02-28T14:09:20+00:00","dateModified":"2024-11-06T10:59:19+00:00","mainEntityOfPage":{"@id":"https:\/\/multimediabilgisayar.com\/blog\/ssd-disklerde-veri-guvenligi-ve-ortalama-omurleri\/"},"wordCount":2429,"commentCount":0,"publisher":{"@id":"https:\/\/multimediabilgisayar.com\/blog\/#organization"},"image":{"@id":"https:\/\/multimediabilgisayar.com\/blog\/ssd-disklerde-veri-guvenligi-ve-ortalama-omurleri\/#primaryimage"},"thumbnailUrl":"https:\/\/multimediabilgisayar.com\/blog\/wp-content\/uploads\/2023\/02\/6-1.jpg","articleSection":["Donan\u0131m"],"inLanguage":"tr","potentialAction":[{"@type":"CommentAction","name":"Comment","target":["https:\/\/multimediabilgisayar.com\/blog\/ssd-disklerde-veri-guvenligi-ve-ortalama-omurleri\/#respond"]}]},{"@type":"WebPage","@id":"https:\/\/multimediabilgisayar.com\/blog\/ssd-disklerde-veri-guvenligi-ve-ortalama-omurleri\/","url":"https:\/\/multimediabilgisayar.com\/blog\/ssd-disklerde-veri-guvenligi-ve-ortalama-omurleri\/","name":"SSD Disklerde Veri G\u00fcvenli\u011fi ve Ortalama \u00d6m\u00fcrleri - Multimedia Bilgisayar | Blog","isPartOf":{"@id":"https:\/\/multimediabilgisayar.com\/blog\/#website"},"primaryImageOfPage":{"@id":"https:\/\/multimediabilgisayar.com\/blog\/ssd-disklerde-veri-guvenligi-ve-ortalama-omurleri\/#primaryimage"},"image":{"@id":"https:\/\/multimediabilgisayar.com\/blog\/ssd-disklerde-veri-guvenligi-ve-ortalama-omurleri\/#primaryimage"},"thumbnailUrl":"https:\/\/multimediabilgisayar.com\/blog\/wp-content\/uploads\/2023\/02\/6-1.jpg","datePublished":"2023-02-28T14:09:20+00:00","dateModified":"2024-11-06T10:59:19+00:00","description":"SSD diskler g\u00fcvenli mi? SSD disklerdeki bigliler silinmiyor mu? SSD mi yoksa HDD mi daha guvenli? SSD disklerin ortalama \u00f6mr\u00fc ne kadar?","breadcrumb":{"@id":"https:\/\/multimediabilgisayar.com\/blog\/ssd-disklerde-veri-guvenligi-ve-ortalama-omurleri\/#breadcrumb"},"inLanguage":"tr","potentialAction":[{"@type":"ReadAction","target":["https:\/\/multimediabilgisayar.com\/blog\/ssd-disklerde-veri-guvenligi-ve-ortalama-omurleri\/"]}]},{"@type":"ImageObject","inLanguage":"tr","@id":"https:\/\/multimediabilgisayar.com\/blog\/ssd-disklerde-veri-guvenligi-ve-ortalama-omurleri\/#primaryimage","url":"https:\/\/multimediabilgisayar.com\/blog\/wp-content\/uploads\/2023\/02\/6-1.jpg","contentUrl":"https:\/\/multimediabilgisayar.com\/blog\/wp-content\/uploads\/2023\/02\/6-1.jpg","width":893,"height":527},{"@type":"BreadcrumbList","@id":"https:\/\/multimediabilgisayar.com\/blog\/ssd-disklerde-veri-guvenligi-ve-ortalama-omurleri\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Anasayfa","item":"https:\/\/multimediabilgisayar.com\/blog\/"},{"@type":"ListItem","position":2,"name":"SSD Disklerde Veri G\u00fcvenli\u011fi ve Ortalama \u00d6m\u00fcrleri"}]},{"@type":"WebSite","@id":"https:\/\/multimediabilgisayar.com\/blog\/#website","url":"https:\/\/multimediabilgisayar.com\/blog\/","name":"Multimedia Bilgisayar | Blog","description":"","publisher":{"@id":"https:\/\/multimediabilgisayar.com\/blog\/#organization"},"potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/multimediabilgisayar.com\/blog\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"tr"},{"@type":"Organization","@id":"https:\/\/multimediabilgisayar.com\/blog\/#organization","name":"Multimedia Bilgisayar | Blog","url":"https:\/\/multimediabilgisayar.com\/blog\/","logo":{"@type":"ImageObject","inLanguage":"tr","@id":"https:\/\/multimediabilgisayar.com\/blog\/#\/schema\/logo\/image\/","url":"https:\/\/multimediabilgisayar.com\/blog\/wp-content\/uploads\/2024\/11\/Multi-Logo-Siyah.png","contentUrl":"https:\/\/multimediabilgisayar.com\/blog\/wp-content\/uploads\/2024\/11\/Multi-Logo-Siyah.png","width":2386,"height":403,"caption":"Multimedia Bilgisayar | Blog"},"image":{"@id":"https:\/\/multimediabilgisayar.com\/blog\/#\/schema\/logo\/image\/"}},{"@type":"Person","@id":"https:\/\/multimediabilgisayar.com\/blog\/#\/schema\/person\/75acd01e1e2de1d9d7b9c18ecfd81c90","name":"Multimedia","image":{"@type":"ImageObject","inLanguage":"tr","@id":"https:\/\/multimediabilgisayar.com\/blog\/#\/schema\/person\/image\/","url":"https:\/\/secure.gravatar.com\/avatar\/90ae74e7c1a5a394ce7dec103aa0919c6a0a7c2f7e01f9275dca8e0c3f598c9f?s=96&d=wp_user_avatar&r=g","contentUrl":"https:\/\/secure.gravatar.com\/avatar\/90ae74e7c1a5a394ce7dec103aa0919c6a0a7c2f7e01f9275dca8e0c3f598c9f?s=96&d=wp_user_avatar&r=g","caption":"Multimedia"},"sameAs":["https:\/\/multimediabilgisayar.com\/blog"],"url":"https:\/\/multimediabilgisayar.com\/blog\/author\/multi-admin\/"}]}},"_links":{"self":[{"href":"https:\/\/multimediabilgisayar.com\/blog\/wp-json\/wp\/v2\/posts\/4536","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/multimediabilgisayar.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/multimediabilgisayar.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/multimediabilgisayar.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/multimediabilgisayar.com\/blog\/wp-json\/wp\/v2\/comments?post=4536"}],"version-history":[{"count":62,"href":"https:\/\/multimediabilgisayar.com\/blog\/wp-json\/wp\/v2\/posts\/4536\/revisions"}],"predecessor-version":[{"id":12009,"href":"https:\/\/multimediabilgisayar.com\/blog\/wp-json\/wp\/v2\/posts\/4536\/revisions\/12009"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/multimediabilgisayar.com\/blog\/wp-json\/wp\/v2\/media\/4539"}],"wp:attachment":[{"href":"https:\/\/multimediabilgisayar.com\/blog\/wp-json\/wp\/v2\/media?parent=4536"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/multimediabilgisayar.com\/blog\/wp-json\/wp\/v2\/categories?post=4536"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/multimediabilgisayar.com\/blog\/wp-json\/wp\/v2\/tags?post=4536"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
<\/p>\n
\u00a0SSD’lerde \u015fifrelemenin \u00f6nemi<\/h2>\n
<\/p>\n
Geleneksel sabit disklerin (HDD) yerine performans\u0131 a\u00e7\u0131s\u0131ndan \u00f6n planda olan SSD\u2018ler (Solid State Diskler) yani kat\u0131 hal diskleri, veri depolamak i\u00e7in mekanik disklerdeki manyetlik kay\u0131t ortam\u0131n\u0131n yerini alan bir veri depolama \u00e7\u00f6z\u00fcm\u00fcd\u00fcr. Bu s\u00fcr\u00fcc\u00fcler, hareketli manyetik disklerin bulundu\u011fu sabit disklere oranla daha d\u00fc\u015f\u00fck g\u00fc\u00e7 t\u00fcketimi, y\u00fcksek dayan\u0131kl\u0131l\u0131k, hafiflik ve etkili performans gibi \u00f6zelliklere sahiptir. Fiyatlar\u0131n\u0131n d\u00fc\u015fmeye ba\u015flamas\u0131yla laptoplar ba\u015fta olmak \u00fczere bir\u00e7ok cihazda kullan\u0131lmaya ba\u015flanan SSD disklerin \u00fczerlerine kaydedilen verileri silmemek gibi \u00e7ok tehlikeli bir yan etkisi de var.<\/strong><\/p>\n NAND flash tabanl\u0131 ve Samsung taraf\u0131ndan geli\u015ftirilmi\u015f bu yeni nesil depolama \u00e7\u00f6z\u00fcm\u00fc SSD\u2019ler hali haz\u0131rda kullan\u0131lan hard disklere k\u0131yasla \u00e7ok daha h\u0131zl\u0131lar, mekanik par\u00e7a bulundurmad\u0131klar\u0131 i\u00e7in d\u0131\u015f etkilere kar\u015f\u0131 daha dayan\u0131kl\u0131lar, ilk a\u00e7\u0131l\u0131\u015f ve eri\u015fim h\u0131zlar\u0131 daha y\u00fcksek ve de ar\u0131za yapma olas\u0131l\u0131klar\u0131 daha d\u00fc\u015f\u00fckt\u00fcr. Ama SSD\u2019lerin b\u00fct\u00fcn bu avantajlar\u0131na ra\u011fmen \u00fczerine kaydedilmi\u015f veriler silinmeye niyetlendi\u011finde bunlar\u0131 hi\u00e7bir \u015fekilde silmemeleri en b\u00fcy\u00fck dezavantaj\u0131d\u0131r. Bu sorun \u00fczerine en kapsaml\u0131 \u00e7al\u0131\u015fmas\u0131 birka\u00e7 y\u0131l \u00f6nce UC San Diego \u00dcniversitesi ara\u015ft\u0131rmac\u0131lar\u0131 taraf\u0131ndan yap\u0131lan testler sonucunda ortaya \u00e7\u0131km\u0131\u015f ve geleneksel sabit diskler i\u00e7in kullan\u0131lan veri temizleme i\u015flemelerinin yeni nesil depolama ayg\u0131t\u0131 olan SSD\u2019lerde hi\u00e7bir i\u015fe yaramad\u0131\u011f\u0131 tespit edilmi\u015fti. SSD\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 HDD<\/strong><\/p>\n SSD\u2019lerde veri depolama i\u015flemi HDD\u2019lerde oldu\u011fu gibi manyetik plakalar \u00fczerine yazmak yerine, i\u00e7erisindeki kontrolc\u00fcler vas\u0131tas\u0131yla veriyi yazarken diskin farkl\u0131 b\u00f6lgelerindeki az ya da hi\u00e7 kullan\u0131lmam\u0131\u015f yerlerine y\u00f6nlendirilerek yap\u0131l\u0131r. Yani HDD\u2019lerde oldu\u011fu gibi verilerin s\u00fcr\u00fcc\u00fcde nereye yaz\u0131laca\u011f\u0131na bilgisayar de\u011fil, diskteki kontrolc\u00fc elemanlar karar verir. Bu y\u00fczden veriler tek tek silinmek yerine ancak k\u00fcmeler halinde silinebilir. Silme i\u015flemi de uzun s\u00fcrd\u00fc\u011f\u00fcnden bitlik veriler i\u00e7in bile t\u00fcm k\u00fcme okunur, \u00fczerinde de\u011fi\u015fiklik yap\u0131l\u0131r ve yeniden yaz\u0131l\u0131r. Eski bilginin bulundu\u011fu alan sonradan silinmek \u00fczere i\u015faretlenip \u00f6ylece b\u0131rak\u0131l\u0131r. \u0130\u015fte bundan \u00f6t\u00fcr\u00fc ara\u015ft\u0131rmac\u0131lar sabit diskler \u00fczerinde veri silinmesinde en etkili y\u00f6ntemler olan Gutmann (35 kez), NSA (7 kez) ve Us DoD 5220.22-M (3 kez) gibi methodlar\u0131 denediklerinde bile SSD\u2019lerde ba\u015far\u0131l\u0131 olamam\u0131\u015flar, aksine \u00f6nemli miktarda verinin hala disk \u00fczerinde kald\u0131\u011f\u0131n\u0131 tespit etmi\u015flerdir: SSD-veri-silme-kurtarma Ara\u015ft\u0131rmac\u0131lar 1000 MB\u2019l\u0131k verinin silinip geri getirilmesi testinde (yukar\u0131daki grafik) baz\u0131 \u00f6zel silme y\u00f6ntemlerinin hi\u00e7 ba\u015far\u0131l\u0131 olamad\u0131\u011f\u0131n\u0131, \u00e7ok g\u00fcvenilen tekniklerin ise maalesef HDD\u2019lerde sergiledikleri ba\u015far\u0131y\u0131 SSD\u2019lerde g\u00f6stermediklerini ortaya koydular. Bu durum da, ticari s\u0131r sahibi \u015firketler veya hassas nitelikte veri ta\u015f\u0131yan devlet kurumlar\u0131 i\u00e7in \u00e7ok ciddi problem te\u015fkil edebilir. Bu veriler \u0131\u015f\u0131\u011f\u0131nda hassas ve g\u00fcvenlik verilerinin asla SSD diskler \u00fczerinde ta\u015f\u0131nmamas\u0131 gerekir. E\u011fer bu diskler kullanacaksa da, disklerle olan i\u015f bittikten sonra verileri temizlemek i\u00e7in k\u0131rma, par\u00e7alama ve yakma gibi fiziksel yollar\u0131 kullanmak daha g\u00fcvenilirdir.<\/p>\n <\/p>\n Flash dayan\u0131m \u00f6zellikleri, bir SSD\u2019nin \u00f6mr\u00fcn\u00fc \u201ctahmin etmeye\u201d yard\u0131mc\u0131 olabilir. Dayan\u0131m tipik olarak a\u015fa\u011f\u0131daki \u015fekillerde \u00f6l\u00e7\u00fcl\u00fcr:<\/p>\n \u00d6rne\u011fin DWPD de\u011feri 1,3 kapasitesi 1TB ve garanti s\u00fcresi 3 y\u0131l olan bir\u00a02,5 in\u00e7 SATA SSD\u00a0s\u00fcr\u00fcc\u00fc i\u00e7in TBW de\u011feri : 1,3 x 3 x 365 x 1024 \/ 1024 = 1423,5 yani yakla\u015f\u0131k 1450TB\u2019 dir.<\/p>\n Yukar\u0131daki \u00f6rne\u011fi uyarlayarak;\u00a0 TBW de\u011feri 1450TB, kapasitesi 1TB ve garanti s\u00fcresi 3 y\u0131l olan bir 2,5 in\u00e7 SATA SSD s\u00fcr\u00fcc\u00fc i\u00e7in DWPD de\u011feri : (1450 x 1024) \/ (1024 x 3 x 365) =1,3 Bunun anlam\u0131, garanti s\u00fcresi boyunca 1TB kapasiteli s\u00fcr\u00fcc\u00fcye her g\u00fcn kapasitesinin 1,3 kat\u0131 yani 1,3TB veri yaz\u0131labilir.<\/p>\n SSD \u00fcreticileri s\u00fcr\u00fcc\u00fc \u00f6mr\u00fcn\u00fc uzatmak i\u00e7in \u00e7e\u015fitli\u00a0mekanizmalar\u00a0geli\u015ftirmi\u015flerdir. \u00d6rne\u011fin Advanced Wear Leveling, bloklar\u0131n her birinin e\u015fit \u015fekilde yazma silme i\u015flemi yap\u0131lmas\u0131n\u0131 sa\u011flayarak yo\u011fun kullan\u0131lan bloklar\u0131n k\u0131sa s\u00fcrede kullan\u0131lmaz hale gelmesini \u00f6nler. A\u015f\u0131nma E\u015fitleme olarak \u00e7evrilebilecek\u00a0Wear leveling<\/em>\u00a0i\u015flevi ile SSD depolama cihaz\u0131n\u0131n kullan\u0131m \u00f6mr\u00fcn\u00fcn uzamas\u0131 sa\u011flan\u0131r.<\/p>\n \u00c7al\u0131\u015fma s\u0131cakl\u0131\u011f\u0131 bir s\u00fcr\u00fcc\u00fcn\u00fcn, i\u015f y\u00fck\u00fc, i\u015flevler, uygulamalar ve \u00e7evresel \u015fartlara ba\u011fl\u0131 olarak etkin bir \u015fekilde \u00e7al\u0131\u015fabilece\u011fi s\u0131cakl\u0131k de\u011ferini ifade eder. SSD s\u00fcr\u00fcc\u00fcler genel olarak a\u015fa\u011f\u0131daki gibi \u00fc\u00e7 s\u0131cakl\u0131k seviyesine g\u00f6re s\u0131n\u0131fland\u0131r\u0131l\u0131rlar.<\/p>\n Ticari<\/strong><\/p>\n<\/td>\n End\u00fcstriyel<\/strong><\/p>\n<\/td>\n Askeri<\/strong><\/p>\n<\/td>\n<\/tr>\n 0\u00b0 ile 70\u00b0C aras\u0131<\/p>\n<\/td>\n -40\u00b0 ile 85\u00b0C aras\u0131<\/p>\n<\/td>\n -55\u00b0 ile 125\u00b0C aras\u0131<\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n Depolama performans\u0131; SSD s\u00fcr\u00fcc\u00fcn\u00fcn veriye eri\u015firken, i\u015flerken ya da kaydederken i\u015flevlerinin ne kadar iyi \u00e7al\u0131\u015ft\u0131\u011f\u0131n\u0131 belirtir. Okuma \u2013 Yazma H\u0131zlar\u0131; bir dosyay\u0131 a\u00e7man\u0131n yani veriyi okuman\u0131n ya da dosyay\u0131 kaydetmenin yani veriyi yazman\u0131n belirli bir s\u00fcre i\u00e7erisinde ne kadar s\u00fcrd\u00fc\u011f\u00fcn\u00fc \u00f6l\u00e7er. Genelikle saniyede ger\u00e7ekle\u015fen iki farkl\u0131 h\u0131z t\u00fcr\u00fc \u00f6l\u00e7\u00fcmler i\u00e7in kullan\u0131lmaktad\u0131r.<\/p>\n SNIA<\/strong>\u00a0(Storage Networking Industry Association) taraf\u0131ndan belirlenmi\u015f, her biri performans\u0131n farkl\u0131 bir boyutunu \u00f6l\u00e7en \u00fc\u00e7 temel \u00f6l\u00e7\u00fcm t\u00fcr\u00fc mevcuttur.<\/p>\n \u00d6l\u00e7\u00fcm<\/strong><\/p>\n<\/td>\n Tan\u0131m<\/strong><\/p>\n<\/td>\n A\u00e7\u0131klama<\/strong><\/p>\n<\/td>\n<\/tr>\n IOPS<\/strong><\/p>\n<\/td>\n Y\u00fcksek de\u011fer daha iyidir.<\/p>\n<\/td>\n<\/tr>\n \u00c7\u0131kt\u0131 Bant Geni\u015fli\u011fi <\/strong><\/p>\n<\/td>\n Y\u00fcksek de\u011fer daha iyidir.<\/p>\n<\/td>\n<\/tr>\n Gecikme\/Latency<\/strong><\/p>\n<\/td>\n D\u00fc\u015f\u00fck de\u011fer daha iyidir.<\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n \u00dcr\u00fcn \u00f6zelliklerinde en yayg\u0131n kullan\u0131lan \u00fc\u00e7 \u00f6l\u00e7\u00fcm tipi.<\/p>\n \u0130nsanlar beklemekten hi\u00e7 ho\u015flanmaz. \u00d6zellikle hemen her \u015feye bir anda ula\u015f\u0131labildi\u011fi g\u00fcn\u00fcm\u00fczde, kullan\u0131c\u0131lar\u0131na h\u0131zl\u0131 yan\u0131t s\u00fcreleri sa\u011flayamayan i\u015fletmeler; memnuniyetsiz kullan\u0131c\u0131 ve m\u00fc\u015fteriler ile kar\u015f\u0131 kar\u015f\u0131ya kalacakt\u0131r. Pek \u00e7ok veri depolama altyap\u0131s\u0131nda, y\u00fcksek IOPS de\u011ferlerine b\u00fcy\u00fck \u00f6nem verilerek depolama performans\u0131n\u0131n art\u0131r\u0131lmas\u0131 daima birinci \u00f6nceliktir. IOPS, aktar\u0131m h\u0131z\u0131 ya da bant geni\u015fli\u011fi; depolama cihaz\u0131n\u0131n veri okuyabildi\u011fi ya da yazabildi\u011fi h\u0131z\u0131 farkl\u0131 \u015fekillerde g\u00f6steren de\u011ferlerdir. Her ikisi de ne t\u00fcr verilerin i\u015flendi\u011fine ba\u011fl\u0131 olarak \u00f6nemlidir.<\/p>\n Videolar gibi b\u00fcy\u00fck boyutlu dosyalar ile \u00e7al\u0131\u015f\u0131rken y\u00fcksek aktar\u0131m h\u0131z\u0131 olan depolama birimleri, y\u00fcksek \u00e7\u00f6z\u00fcn\u00fcrl\u00fckl\u00fc i\u00e7erikleri i\u015flerken bekleme s\u00fcrelerinin k\u0131salmas\u0131n\u0131 sa\u011flar. \u00d6te yandan, \u00e7ok say\u0131da rastgele k\u00fc\u00e7\u00fck aktar\u0131m gerektiren veri taban\u0131 gibi\u00a0kurumsal\u00a0uygulamalar ile \u00e7al\u0131\u015f\u0131l\u0131yorsa IOPS de\u011feri y\u00fcksek olan depolama birimleri en iyi performans\u0131 sunacaklard\u0131r. Gecikme, IOPS ve aktar\u0131m h\u0131z\u0131 bilgilerini daha anla\u015f\u0131l\u0131r hale getirir. Gecikme de\u011feri, depolama biriminden bir istek yap\u0131lmas\u0131 ile bu iste\u011fin ger\u00e7ekle\u015ftirilmeye ba\u015flanmas\u0131 aras\u0131nda ge\u00e7en s\u00fcredir. D\u00fc\u015f\u00fck gecikme s\u00fcresi olan yani h\u0131zl\u0131 tepki vermek \u00fczere optimize edilmi\u015f depolama cihazlar\u0131 daha k\u0131sa bekleme s\u00fcreleri sunduklar\u0131 i\u00e7in kullan\u0131c\u0131ya daha belirgin h\u0131z hissi verir. I\/O yani girdi\/\u00e7\u0131kt\u0131 i\u015flemlerinin yo\u011fun oldu\u011fu i\u015f y\u00fcklerinde, e\u011fer gecikme y\u00fcksekse, k\u0131sa bile olsa \u00e7ok say\u0131da ger\u00e7ekle\u015fecek olan bekleme s\u00fcreleri kullan\u0131c\u0131 deneyimini olumsuz \u015fekilde etkiler. Farkl\u0131 SSD s\u00fcr\u00fcc\u00fcleri kar\u015f\u0131la\u015ft\u0131r\u0131rken \u00f6nemli olan de\u011ferleri en y\u00fcksek olan tercih etmek de\u011fildir. Kullan\u0131m amac\u0131na en uygun, potansiyel i\u015f y\u00fckleri i\u00e7in en do\u011fru \u00e7\u00f6z\u00fcm\u00fc tercih ederek en do\u011fru yat\u0131r\u0131m olacak \u00fcr\u00fcn\u00fc se\u00e7mektir.<\/p>\n <\/p>\n SSD’ler san\u0131ld\u0131\u011f\u0131 kadar g\u00fcvenli de\u011fil mi? Solid State Disk (SSD)‘ler g\u00fcn ge\u00e7tik\u00e7e kendilerine daha fazla yer buluyor ve\u00a0HDD‘ler yerini yava\u015f yava\u015f bu yeni ve h\u0131zl\u0131 disklere b\u0131rak\u0131yor. Bunun en a\u00e7\u0131k ispat\u0131 da\u00a0Intel\u00a0gibi b\u00fcy\u00fck \u015firketlerin de\u00a0SSD\u00a0pazar\u0131na girmesinde sakl\u0131 asl\u0131nda. SSD’lerin HDD’lere nazaran bu kadar\u00a0pop\u00fcler\u00a0olmas\u0131ndaki en \u00f6nemli fakt\u00f6r \u015f\u00fcphesiz bu ayg\u0131tlar\u0131n olduk\u00e7a h\u0131zl\u0131 olmas\u0131. \u00d6zellikle\u00a0laptoplarda\u00a0fark\u0131 rahat\u00e7a hissedilen […]<\/p>\n","protected":false},"author":1,"featured_media":4539,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[245],"tags":[],"class_list":["post-4536","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-donanim"],"yoast_head":"\n \u015eifrelemenin bir di\u011fer faydas\u0131 ise SSD<\/strong>‘lerin \u00fczerinde yer alan verilerin daha kolay bir \u015fekilde silinebilmesini sa\u011flamas\u0131.\u00a0iFixlt<\/strong>‘in CEO’su\u00a0Kyle Wiens<\/strong>‘e g\u00f6re\u00a0HDD<\/strong>‘lerde oldu\u011fu gibi, SSD’ler de bir\u00e7ok dosya kopyas\u0131 olu\u015fturuyor, ancak \u015fifreleme yaz\u0131l\u0131m\u0131 bu g\u00fcvenli dosyalar\u0131n silinebilmesine yard\u0131mc\u0131 oluyor. Sonu\u00e7 olarak HDD’lere g\u00f6re SSD’lerin \u00fczerindeki verilerin silinebilmesinin daha kolay oldu\u011fu a\u00e7\u0131k. Veriler, SSD i\u00e7indeki elektronlar\u0131n \u00fczerine depolan\u0131yor. HDD’lerde ise durum daha farkl\u0131: Verilerin silinebilmesi i\u00e7in \u00fczerine yeni bir veri giri\u015finin yap\u0131lmas\u0131 gerekiyor ya da fiziksel olarak zarar g\u00f6rmesiyle verilerin\u00a0tamamen<\/strong>\u00a0ortadan kalkabilmesi m\u00fcmk\u00fcn. SSD’deki verilerin kolay siliniyor olmas\u0131n\u0131n\u00a0en olumsuz yan\u0131<\/strong>\u00a0ise dikkatsizlikten kaynaklanan hatalarla verilerin kolayca kaybedilebilmesi ve elbette tekrar kurtar\u0131lamamas\u0131.<\/p>\n\u00a0<\/h2>\n
Solid State Diskler (SSD) \u00dczerlerine Kaydedilen Verileri Hi\u00e7bir Zaman Silmiyor<\/strong><\/h2>\n
<\/p>\nDayan\u0131m ve G\u00fcvenilirlik\u00a0 \u00d6zellikleri<\/h1>\n
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Is\u0131l \u00d6zellikler<\/h2>\n
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\n Bu \u00d6l\u00e7\u00fcmler ne i\u015fe yarar?<\/h2>\n