> Theodore Y. Ts'o - 10.04.18, 20:43: > > First of all, what storage devices will do when they hit an exception > > condition is quite non-deterministic. For example, the vast majority > > of SSD's are not power fail certified. What this means is that if > > they suffer a power drop while they are doing a GC, it is quite > > possible for data written six months ago to be lost as a result. The > > LBA could potentialy be far, far away from any LBA's that were > > recently written, and there could have been multiple CACHE FLUSH > > operations in the since the LBA in question was last written six > > months ago. No matter; for a consumer-grade SSD, it's possible for > > that LBA to be trashed after an unexpected power drop. Pointers to documentation or papers or anything? The only google results I can find for "power fail certified" are your posts. I've always been confused by SSD power-loss protection, as nobody seems completely clear whether it's a safety or a performance feature. --b.
