On Mon, 28 Aug 2017 at 12:58:24 +0200 Narcis Garcia <[email protected]> wrote:
> 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 They do more than that: https://en.wikipedia.org/wiki/Flash_file_system Alessandro _______________________________________________ Dng mailing list [email protected] https://mailinglists.dyne.org/cgi-bin/mailman/listinfo/dng
