Lustre 1.6 Operations Manual

9.1.6 Lustre Quota Statistics
Lustre includes statistics that monitor quota activity, such as the kinds of quota RPCs
sent during a specific period, the average time to complete the RPCs, etc. These
statistics are useful to measure performance of a Lustre filesystem.
Each quota statistic consists of a quota event and min_time, max_time and sum_time
values for the event.
Quota Event
sync_acq_req
sync_rel_req
async_acq_req
async_rel_req
wait_for_blk_quota
(lquota_chkquota)
wait_for_ino_quota
(lquota_chkquota)
wait_for_blk_quota
(lquota_pending_commit)
wait_for_ino_quota
(lquota_pending_commit)
wait_for_pending_blk_quota_req
(qctxt_wait_pending_dqacq)
wait_for_pending_ino_quota_req
(qctxt_wait_pending_dqacq)
Description
Quota slaves send a acquiring_quota request and
wait for its return.
Quota slaves send a releasing_quota request and
wait for its return.
Quota slaves send an acquiring_quota request and
do not wait for its return.
Quota slaves send a releasing_quota request and do
not wait for its return.
Before data is written to OSTs, the OSTs check if the
remaining block quota is sufficient. This is done in
the lquota_chkquota function.
Before files are created on the MDS, the MDS checks
if the remaining inode quota is sufficient. This is
done in the lquota_chkquota function.
After blocks are written to OSTs, relative quota
information is updated. This is done in the
lquota_pending_commit function.
After files are created, relative quota information is
updated. This is done in the
lquota_pending_commit function.
On the MDS or OSTs, there is one thread sending a
quota request for a specific UID/GID for block
quota at any time. At that time, if other threads
need to do this too, they should wait. This is done
in the qctxt_wait_pending_dqacq function.
On the MDS, there is one thread sending a quota
request for a specific UID/GID for inode quota at
any time. If other threads need to do this too, they
should wait. This is done in the
qctxt_wait_pending_dqacq function.
9-12 Lustre 1.6 Operations Manual • September 2008