[OpenAFS] Re: Fstab options for AFS on SSDs

Gary Buhrmaster gary.buhrmaster@gmail.com
Thu, 1 Aug 2013 19:08:42 +0000

On Thu, Aug 1, 2013 at 5:17 PM, Andrew Deason <adeason@sinenomine.net> wrote:
> 'discard' I've heard may help or hurt performance depending on usage

And on the particular SSD vendor (really the firmware), when it
receives the (SATA) TRIM, or the (SAS) UNMAP command.
Some of the firmware implementations can actually perform
quite badly when told to reclaim (especially) large chunks,
and they go into extended GC operations.  These performance
issues are more likely to manifest themselves in commodity
SSDs than the enterprise ones, but, as always, YMWV.