boot0 fails with ZFS: I/O error - all block copies unavailable

sim

sim

Hi

I have a root on ZFS system which last week I updated to the then-latest 9-STABLE. I now find that I can no longer get past the boot0 loader:

Code: 
FreeBSD/i386 boot
Default: zroot:/boot/kernel/kernel
boot: ZFS: i/o error - all block copies unavailable

Sounds bad. :( Do I have any options at this point? I've seen a few suggestions but they seem to assume you can get to the loader menu.

Any ideas would be very welcome at this point!

Thanks

sim
 
Hi

From memory, only one pool - 'zroot', fully occupying a single drive. (The machine is a desktop PC). The pool has the usual set of filesystems for a full FreeBSD install: /, /var, /usr, /tmp, /home etc. etc.

Thanks

sim
 
If you have a non-redundant pool (meaning only a single disk with copies=1), then you're pretty much screwed. You have disk corruption, and no way to repair it.
 
Well, I finally got a chance to look into this, and am happy to say I recovered the disk. Luckily I saw a slightly tangential article which demonstrated rewriting the zfs bootcode , something like this:

Code: 
gpart bootcode -b /mnt2/boot/pmbr -p /mnt2/boot/gptzfsboot -i 1 da0

I did that using the recovery shell on the install CD, and it did the trick.

Maybe that'll help someone else someday :)

sim
 
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