Usenix & NetApp: tanulmány a nagyvállalati SSD-k megbízhatóságábol

Hardver

A tanulmány itt (PDF), a teljes cikk és elemzés itt található.

SURPRISES: One of the most surprising findings is that drives with LESS usage experience higher replacement rates. Another surprise is that infant mortality actually rises over the first year of field use before starting to decline. Another finding is that SLC (single level cell), the most costly drives, are NOT more reliable than MLC drives. And while the newest high density 3D-TLC (triple level cell) drives have the highest overall replacement rate, the difference is likely not caused by the 3D-TLC technology, but the capacity level or cell size employed in the drive. Higher density cells exhibit more failures.

( joco01 v | 2020. 03. 01., v – 08:47 )

Anonimizálták a meghajtók gyártóit sajnos, de gondolom nem lenne túl nehéz kitalálni a megadott adatok alapján.

( Botond | 2020. 03. 01., v – 18:55 )

Szerkesztve: 2020. 03. 01., v – 18:57

Úgy néz ki, hogy a hibák egy része nem közvetlenül az SSD alapját adó NAND flash technológiát érinti. Ezek az SSD-k rendszerint tartalmaznak DRAM-ot is: In almost 33 percent of the failures, the SCSI layer saw a hardware error reported by the SSD, that triggered immediate SSD replacement and data reconstruction. Such errors might, for example, be caused by ECC errors originating from the drive's DRAM.