Most likely. When fully provisioned the device has a much smaller pool
of cells to manage (i.e. charge) in the background, hence once that pool
is exhausted the device has no option but to stall whilst it clears
(re-charges) a cell, which takes something like 2-5ms.
Daily cron task is though still a good idea - enabling discard mount
option is generally counter-productive since trim is issue way too
often, destroying performance (in my testing).
On 2013-12-03 13:12, Emmanuel Lacour wrote:
On Tue, Dec 03, 2013 at 12:48:21PM +0000, James Pearce wrote:
How much (%) is left unprovisioned on those (840s?) ? And were they
trim'd/secure erased before deployment?
unfortunatly, everything was provisioned (thought, there is free
spaces
in the VG) due to lack of knowledge.
Nothing special was made before running the cluster, just a somewhat
standard Debian install on top of those SSDs.
That may explain we needed to run fstrim (I added a daily cron for
this).
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