Is that anything like a cluster fsck? ]:>

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While an _incremental_ fsck isn't so easy for existing filesystem types,

what is pretty easy to automate is making a read-only snapshot of a

filesystem via LVM/DM and then running e2fsck against that.  The kernel

and filesystem have hooks to flush the changes from cache and make the

on-disk state consistent.
You can then set the the ext[234] superblock mount count and last check

time via tune2fs if all is well, or schedule an outage if there are

inconsistencies found.
There is a copy of this script at:

http://osdir.com/ml/linux.lvm.devel/2003-04/msg00001.html
Note that it might need some tweaks to run with DM/LVM2 commands/output,

but is mostly what is needed.
Cheers, Andreas

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Andreas Dilger

Sr. Staff Engineer, Lustre Group

Sun Microsystems of Canada, Inc.
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You can do this now with ddsnap (an out-of-tree device mapper target)

either by checking a local snapshot or a replicated snapshot on a

different machine, see:
    http://zumastor.org/
Doing the check on a remote machine seems attractive because the fsck

does not create a load on the server.
Regards,
Daniel

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