HI Greg,
Am 13.02.2013 21:38, schrieb Gregory Farnum:
Sorry it's MB - so the SSDs get fully utilized meased via /proc/diskstats .
I'm wondering if this is a lack of punch support on the kernel..
I'm using 3.7.7 running XFS.
Sounds like maybe the client trim is ending up issuing a truly
ridiculous number of truncate or trim operations from librbd to the
OSDs?
Yes for every single unused disk block ;-(
Like one for every RADOS block that could exist, or possibly
even for each VM disk block? (Perhaps not; I'm not sure how trim got
implemented.)
I'm pretty sure Disk block...
FWIW a full fstrim is not generally an operation you can really do in
the background even on a real desktop...so if running it one one or
several VMs makes the cluster unusable for all of them, that's a
problem, but if it only causes IO trouble for the one which is
trimming that'd be not ideal but less of an issue.
Yes if you can control this yes if you have no access to the client
machines no... or you can just disable trim support - but it's a nice
feature for provisioning...
Greets,
Stefan
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