Date: Mon, 23 Jan 2012 21:10:39 +0100 From: Olivier Smedts <olivier@gid0.org> To: Matthew Seaman <m.seaman@infracaninophile.co.uk> Cc: "freebsd-stable@freebsd.org" <freebsd-stable@freebsd.org>, Steven Hartland <killing@multiplay.co.uk> Subject: Re: ZFS: i/o error - all block copies unavailable on large disk number machines Message-ID: <CABzXLYNhiQJsMhFAsHorwpifDX1f_n5EhCL2yhQySg=QuksnvQ@mail.gmail.com> In-Reply-To: <4F1DBA47.8080504@infracaninophile.co.uk> References: <520B9285BCC0498286196195933D67E9@multiplay.co.uk> <CB4ED392-3DED-40C1-83B0-7DB3B9C612C0@mac.com> <4F1DA991.1060601@infracaninophile.co.uk> <7F1E17105173440B8C52DB9AAFA7A400@multiplay.co.uk> <4F1DBA47.8080504@infracaninophile.co.uk>
next in thread | previous in thread | raw e-mail | index | archive | help
Le lundi 23 janvier 2012, Matthew Seaman <m.seaman@infracaninophile.co.uk> a =E9crit : > 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. >> >> 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. Have you tried using a separate /boot on a zfs with copies=3D2 (or the numb= er of vdevs composing the pool) ? > Cheers, > > Matthew > > -- > 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 > > --=20 Olivier Smedts _ ASCII ribbon campaign ( ) e-mail: olivier@gid0.org - against HTML email & vCards X www: http://www.gid0.org - against proprietary attachments / \ "Il y a seulement 10 sortes de gens dans le monde : ceux qui comprennent le binaire, et ceux qui ne le comprennent pas."
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?CABzXLYNhiQJsMhFAsHorwpifDX1f_n5EhCL2yhQySg=QuksnvQ>