Snapshot corruption.

[David Gilbert]

>>>>> "Julian" == Julian Elischer <julian at elischer.org> writes:

Julian> David Gilbert wrote:

>> I've got a medium busy server (few thousand mail messages a day,
>> web, webmail, imap, etc) that I can fairly reliably reproduce
>> filesystem corruption by creating multiple snapshots and deleting
>> them.
>> 
>> I don't think I'm up to debugging this, but I may be able to
>> provide an exercise platform.

Julian> can you characterise the corruption?

Sure.  Typically the system will crash with an ffs panic of some
random type.  When it comes back, we run non-background fsck's because
manual fsck is sometimes required.

Corruption varies.  Some stuff sometimes pops up in lost+found.  Some
stuff can vanish (not 100% positive on that).  But most worringly, is
that some files come back corrupted (ie berkley db files that db won't
read).

Dave.

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