On 2016-11-22 10:35, Jason A Ramsey wrote:
Can anyone recommend a bulletproof process for OS patching a pacemaker
cluster that manages a drbd mirror (with LVM on top of the drbd and luns
defined for an iscsi target cluster if that matters)? Any time I’ve
tried to mess with the cluster, it seems like I manage to corrupt my
drbd filesystem, and now that I have actual data on the thing, that’s
kind of a scary proposition. Thanks in advance!
+1
I managed to clearly standby/unstandby mine a few times initially --
otherwise I wouldn't have put it in production -- but on the last
several reboots DRBD filesystem just wouldn't unmount. Never corrupted
anything but it's still a serious PITA. Especially with a couple of
haresources pairs right next to it switching over perfectly every time.
Insult to injury, the RA start spewing "can't unmount, somebody's
holding open" messages to the console at such rate that it is impossible
to login and try lsof, fuser, or anything.
Dima
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