Hi,I noticed weird stuff with pacemaker when I ask it to clone a group. Let's say that I have a group containing 4 primitives (1 named process + 3 IPAddr2 to load on lo). I want to clone the group tom-DNS twice.
crm configure clone tom-DNS-clone tom-DNS meta clone-max=2
If the group is running and I add on the fly a clone it's very often
that I will have : tom-DNS:0, tom-DNS:1 and tom-DNS:2 with one of them
an orphan (I can have more orphans).
Then, if I want to get rid of the orphan, I can try a :
crm_resource -r tom-DNS-clone -C.
That "cleanup" usually just makes the things even worse. It generates
new orphans and pacemaker will move (stop then start) the 2 running
cloned groups to one of 4 groups I have now in the clone resource. I
don't really follow the logic and the log is so verbose I don't know
where I should start or what to find. At the end I usually have a broken
state. Half of the group is running and the other part not (like 2 IPs
only and not the third one nor named).
You will find a log in attachement. Tags : - GO : I have just commit the clone line (above) - DONE: everything seems to be stable now - EOF : we have 9 tom-DNS without touching anything since GO :)So cloned groups are not fun and side effects are random :) I will do more tests without IPAddr2 which seems a bit fancy and dodgy.
My question is : is it a bug or is it a possible constraints issue... ?I also notice an increased load (from 0.5 to 3) when pacemaker has orphans but I don't know what it is doing. CPU is not very high. Cib process uses 15% of cpu and we have no disk IOs. I didn't check maybe it's using a lot the network... All nodes in the ring are impacted with that.
Tell me if you need additional information I can provide. Cheers, Thomas -- * pacemaker 1.0.6 * corosync 1.1.2 * centos 5.4 * 4 nodes (2 of them are DNS nodes) * asymmetrical cluster
clone-commit-after.log.gz
Description: GNU Zip compressed data
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