[OpenAFS] Re: Fstab options for AFS on SSDs

[Gary Buhrmaster]

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.

Gary