Very frequent : Vacuuming child process timed out for db locking.tdb. Bottleneck?
nicolas at ecarnot.net
Mon May 19 03:51:51 MDT 2014
In our two-nodes ctdb setup, with an iscsi qdisk lun, the ctdb log files
are showing frequent message such as :
Vacuuming child process timed out for db locking.tdb
Frequency is around every 3 minutes.
I read it may be due to too numerous locks to "balance/sync" between the
nodes (did I read right?) and taking too much time.
This seems odd to me because we have around 300 users, doing basic
office work, and not particular intensive activity. This seems classical
Our iscsi network is dedicated, and not much loaded.
My two questions are :
- Could those error message mean this ctdb setup is LOOSING some locks,
and thus two users may access read+write the same file (and then corrupt
- what do you advice me to look at, or what to bench?
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