https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=268100
--- Comment #2 from m...@netfence.it ---
(In reply to Warner Losh from comment #1)
First off, there are no "characteristics of the ZFS snapshot": we are talking
about "zpool checkpoint", not "zfs snap".
I have no idea on why loader.efi can't boot from a checkpointed ZFS pool:
I only saw the message above ("can not read checkpoint data").
I don't have the original problematic pool anymore: it was a production server
and I needed to boot it ASAP, so I just issued "zpool checkpoint -d" (that is,
as soon as I relized what the problem was).
I guess, in order to recreate the situation, procedure would be: install 12.3
UEFI+ZFS, checkpoint, upgrade to 13.1 (maybe upgrading boot loader is enough).
The only thing I could add is it was a zraid5 pool (3 disks); not sure it
matters.
Importance is "less than bulk" to me: it would have saved me three hours of
spreading panic if I had known; now I'll simply check if a checkpoint exists
before upgrading (or, if I forget, boot from an USB key and remove it later).
My only goal was to let other people know, so maybe they won't be hit so hard
by this.
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