Comment by throw0101a

> So clearly the zfs devs thought about the possibility of a corrupt superblock, but didn't feel the need to provide a tool to compare the superblocks and restore one from the other copies.

This mailing list post from 2008 talks about using zdb(8) to mark mark certain uberblocks an invalid so another one would be used:

* https://zfs-discuss.opensolaris.narkive.com/Tx4FaUMv/need-he...

ZDB = ZFS debugger. It's been there since the original Solaris release of ZFS.

> That was the point when I stopped trusting zfs.

As opposed to trusting other file systems and volume managers, which do not have checksums, and so you wouldn't even know about the problem in the first place?