Our XSan went down today and upon rebooting the metadata controller
it was discovered that the lun that contained the meta data had
become corrupt. Whereas the two data luns showed up as CVFS format
and had labels the metadata lun prompted an "unreadable, eject
initialize ignore" message at startup and in the XSan admin was
listed as unlabeled. It was listed as "unknown" format and unlabeled
when listed with the other volumes in the command line.
How do I repair this lun? When I try to use CVFSCK command it
complains that the lun "mylun2" which was the name of the corrupted
lun is unavailable. Is there a disk utility of sorts that repairs a
volume (lun) that is CVFS file system?
I see a few command line options but all come with serious warnings.
So, I wish to seek guidance first.
A few more things.
1. the metadata lun is a Raid 1 two disk mirror.
2. the backup controller had not been updated from 1.1 to 1.2 and had
taken over metadata controlling earlier this week before the first
crash which was solved with a restart and the main metadata
controller resumed responsibility. both controllers now have 1.2. I
intend to have a conversation with the guy who only updated the one
controller. :-(
3. both meta data controllers are running 10.4.3 server
4. restarting all of the components of the san did not resolve the
issue.
5. I've tried repairing the LUN map (albeit while raid conditioning
was going on in the background)
6. two LUNs have the same LUN ID 0 but they are on opposite sides of
the XRAID(is that normal?)
7. conditioning continues as I write this and is at 5%
I really don't want to tell this client that all their data on the
San is completely lost. They are a very good client and very good
people. Any help that you could give would be THOROUGHLY appreciated.
Thank you for your time,
James L. McMahan Jr.
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