On 12-Dec-06, at 9:46 AM, George Wilson wrote:
Also note that the UB is written to every vdev (4 per disk) so the
chances of all UBs being corrupted is rather low.
Furthermore the time window where UBs are mutually inconsistent would
be very short, since they'd be updated together?
--Toby
Thanks,
George
Darren Dunham wrote:
DD> To reduce the chance of it affecting the integrety of the
filesystem,
DD> there are multiple copies of the UB written, each with a
checksum and a
DD> generation number. When starting up a pool, the oldest
generation copy
DD> that checks properly will be used. If the import can't find
any valid
DD> UB, then it's not going to have access to any data. Think of
a UFS
DD> filesystem where all copies of the superblock are corrupt.
Actually the latest UB, not the oldest.
My *other* oldest... yeah.
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