On 2016-04-15 06:19, Warner Losh wrote: > On Thu, Apr 14, 2016 at 9:56 PM, Warren Block <wbl...@wonkity.com> wrote: > >> On Thu, 14 Apr 2016, Warner Losh wrote: >> >> The CAM I/O scheduler has been committed to current. This work is described >>> in https://people.freebsd.org/~imp/bsdcan2015/iosched-v3.pdf though the >>> default scheduler doesn't change the default (old) behavior. >>> >>> One possible issue, however, is that it also enables NCQ Trims on ada >>> SSDs. >>> There are a few rogue drives that claim support for this feature, but >>> actually implement data corrupt instead of queued trims. The list of known >>> rogues is believed to be complete, but some caution is in order. >> >> > >> Is the list of drives queryable? Is there an easy way to tell if the >> currently-connected drives are on the list? >> > > /usr/src/sys/cam/ata/ata_da.c has the list. > > dmesg will tell you if it detected a bad one since it prints the drive's > quirks. > But that's no big deal, because the bad one work just fine if you never > issue > a NCQ TRIM. This small group of drives were early adapters of this > technology > > Here's the full list of known rogues: > > Crucial/Micron M500 (all firmware prior to MU07) > Micron M510 MU01 firmware (newer firmware is good) > Crucial/Micron M550 MU01 firmware (newer firmware is good) > Crucial MX100 MU01 firmware (newer firmware is good) > FCCT M500 all firmware > Samsung 830 all firmware > Samsung 840 all firmware > Samsung 850 all firmware > > All of these are at least 18 months old (if not older). There's some > confusing in Linux lists on > the full impact of the Samsung drives (there was a bug in the Linux > implementation (that can't > be present in the FreeBSD implementation) that may have been the root cause > for the Samsung > black listing). Out of an abundance of caution, I've kept them in the list. > Also, it's my belief that > the Crucial/Micron models with MU01 firmware were mostly corrected after > early samples > since most of the channel drives I've helped people debug had MU02 > firmware. Also, a quick > google search shows the MU02 firmware for each of these models has been > available for > at least a year. > > Warner
I suspect this was the reason why Samsung SSD's are listed on the Linux blacklist. https://blog.algolia.com/when-solid-state-drives-are-not-that-solid/ But the article also reports it was a Linux kernel issue ... _______________________________________________ email@example.com mailing list https://lists.freebsd.org/mailman/listinfo/freebsd-current To unsubscribe, send any mail to "freebsd-current-unsubscr...@freebsd.org"