El 28/08/17 a les 11:59, Alessandro Selli ha escrit: > On Sun, 27 Aug 2017 at 17:18:28 -0500 > d_pridge <[email protected]> wrote: > >> Doesn't this affect the expected lifetime for an SSD? > > Little. AFAIK this used to be a more serious concern on the first > generation of SSDs, because they suffered strongly from write-wear and > because firmware, drivers and filesystems did not support write-levelling. > Today this is much less of a concern. SSD cells can stand many more write > operations before wearing (not so so called 3D SSD units, however) and unit's > firmware today apply algorithms to write operations that attempt to spread > writes as evenly as possible to cells avoiding impinging too many times on > the same ones. Which means that, even if you're writing several times on the > same filesystem's blocks (e.g., the FS's log on a journalled FS), these > blocks are mapped to cells spread here and there on the SSD that are generally > different from write operation to another, transparently to the filesystem's > driver and block allocator. Plus, SSD-aware filesystems (designed, among > other things, to reduce the impact of write amplification of cells being > rewritten) further help prolonging the unit's life, regardless of how it is > used. >
"SSD-aware filesystems" are flesystems mounted with no atime _______________________________________________ Dng mailing list [email protected] https://mailinglists.dyne.org/cgi-bin/mailman/listinfo/dng
