Date: Mon, 23 Jan 2012 19:51:35 +0000 From: Matthew Seaman <m.seaman@infracaninophile.co.uk> To: Steven Hartland <killing@multiplay.co.uk> Cc: freebsd-stable@freebsd.org Subject: Re: ZFS: i/o error - all block copies unavailable on large disk number machines Message-ID: <4F1DBA47.8080504@infracaninophile.co.uk> In-Reply-To: <7F1E17105173440B8C52DB9AAFA7A400@multiplay.co.uk> References: <520B9285BCC0498286196195933D67E9@multiplay.co.uk><CB4ED392-3DED-40C1-83B0-7DB3B9C612C0@mac.com> <4F1DA991.1060601@infracaninophile.co.uk> <7F1E17105173440B8C52DB9AAFA7A400@multiplay.co.uk>
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On 23/01/2012 19:29, Steven Hartland wrote:
> Initially the zpool was just the first raidz2. Only after install
> was the second raidz2 added to increase capacity.
>=20
> So what I believe has happened is the new kernel when installed
> happens to have data be located on the second raidz2 which
> consists of disks not available to the BIOS and hence results in
> "all block copies unavailable" from the boot code.
Exactly what happened to me. You can run into this in a nasty way --
insert the drives, and expand the zpool on-line, and everything will
carry on quite happily. Until you next reboot, when it just won't come
back. And you can't undo the expansion of the pool: due to the
copy-on-write behaviour of ZFS even overwriting a file in-place stands a
50% chance of being written to the new vdev.
In my case, I fixed it by having a separate /boot on some USB sticks --
this was only ever accessed to read the kernel, kernel modules and
bootloader at boot time, so no worries over performance.
Cheers,
Matthew
--=20
Dr Matthew J Seaman MA, D.Phil. 7 Priory Courtyard
Flat 3
PGP: http://www.infracaninophile.co.uk/pgpkey Ramsgate
JID: matthew@infracaninophile.co.uk Kent, CT11 9PW
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