[CentOS] Samsung evo 840 fixes
Gordon Messmer
gordon.messmer at gmail.comTue Nov 10 21:43:48 UTC 2015
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On 11/10/2015 12:00 PM, Christer Solskogen wrote: > This is the first I found. > http://linux.slashdot.org/story/15/07/30/1814200/samsung-finds-fixes-bug-in-linux-trim-code > That bug isn't specific to Samsung drives. It affected all SSDs used in raid0 and raid10 configurations. > and https://bugs.launchpad.net/ubuntu/+source/fstrim/+bug/1449005 That's a different bug, entirely. The bug above was a Linux bug, where this is a drive firmware bug. It's worked around in Linux by blacklisting NCQ TRIM for Samsung's drives. The ATA_HORKAGE_NO_NCQ_TRIM flag was introduced in 3.13. I don't see it in CentOS 7's kernel, so it's almost certainly not in C6 either. You're probably better off disabling NCQ or just testing to see if you need TRIM at all. Particularly if you leave some space unallocated on the drive (TRIM it if you were previously using it), many newer drives manage free blocks very well, and see little or no performance hit for systems that don't use TRIM.
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