On 24 July 2014 16:45, Trent W. Buck <trentbuck@gmail.com> wrote:
hannah commodore <hannah@tinfoilhat.net> writes:
On 24 Jul 2014, at 12:07, Russell Coker <russell@coker.com.au> wrote:
This could be related to TRIM. If you have it enabled it can cause significant delays and if you don't then eventually the SSD will need to clear erase blocks and cause delays for random writes.
Thanks. I'll have to see about how to change the TRIM settings on these Plextor drives. They don't show up as individual disks to the OS, but just the single logical volume
You change it by mounting the filesystem with -o trim (or not) or calling fstrim(8). The drives either support it or they don't (they probably do). The iffy bit will be whether the controller tells the OS "this [logical] drive doesn't support TRIM", or passes it through to the physical disks, or if you can configure either behaviour.
I really doubt that particular RAID card supports TRIM. Sorry.
I doubt TRIM is going to be the issue here.
Agreed. Losing it hurts your performance a bit in the long run, but it wouldn't cause SSDs to get kicked out of arrays.