On 16/05/2016 20:55, Mike Snitzer wrote:
There is more to the thinp metadata than just the metadata superblock.
The DM thin-pool's metadata device was purposely split out from the data
device to allow for additional metadata fault protection using RAID.
I'll defer to the LVM developers for if/how LVM can be used to have
thinp metadata redundancy even if you don't have multiple devices to be
able to use a conventional RAID device.
Sure - I'm using thinp on a RAID6 volume, with two disks redundancy.
But what about an user error, or a lvm-related bug, which invalidate the
superblock? In this case, RAID is of no help. On the other side, a
superblock backup copy can be used to restore the system without major
data loss.
More in general, how do you deal with metadata backups?
Thanks.
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