Also note that the UB is written to every vdev (4 per disk) so the
chances of all UBs being corrupted is rather low.
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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