[Ocfs2-users] fsck in startup scripts

[Henrik Carlqvist]

Thanks for a great file system!

I have a two-node cluster working as a HA NFS server. This system has
worked fine for almost a year, but recently I found that an ocfs2 file
system had been corrupted and needed to be repaired with fsck.ocfs2.

Even though I don't think that any data was lost I found that 4 of my 14
ocfs2 partitions had some errors which were corrected by fsck.ocfs2. I
then realized that these errors probably had been there since a rather
long time ago when an UPS broke down. I also found that on my system fsck
is never run on the ocfs2 file systems at reboot unless some kind of
manual work was done to run fsck.

On my Slackware system fsck is supposed to be run at an early stage in the
boot scripts, but this doesn't apply to the ocfs2 file systems as o2cb
hasn't been started at that time. At a late stage in the boot process
/etc/init.d/o2cb and /etc/init.d/ocfs2 is called from rc.local. However
the ocfs2 scripts mounts the file systems without checking them even
if they haven't been cleanly unmounted.

I realize that adding fsck.ocfs2 to the startup scripts might be a non
trivial task, there are a few scenarios that has to be handled:

1) A nice controlled reboot of one node while the other node is running

2) Nice controlled reboot of both nodes at the same time

3) One node crashing for some reason while the other node is running

4) Both nodes crashing and rebooting at the same time

Would it be OK to run fsck.ocfs2 on both nodes after the call to o2cb but
before the call to /etc/init.d/ocfs2?

If one node is still running I suppose that o2cb will prevent fsck.ocfs2
from running as a node has the file systems mounted?

What if both nodes reboot at the same time? Will o2cb make sure that only
one node runs fsck on each file system? If one node tries to mount a file
system which the other node is still running fsck on, will this mounting
be delayed or aborted by o2cb?

Thanks in advance for any advice regarding fsck and ocfs2!

regards Henrik
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