Date: Mon, 23 Jan 2012 17:04:43 -0000 From: "Steven Hartland" <killing@multiplay.co.uk> To: <freebsd-stable@freebsd.org> Subject: ZFS: i/o error - all block copies unavailable on large disk number machines Message-ID: <520B9285BCC0498286196195933D67E9@multiplay.co.uk>
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We did a minor kernel update on a large storage machine here today which runs FreeBSD 8.2 and to our surprise it failed to boot at the loader with "ZFS: i/o error - all block copies unavailable". After some digging we discovered that this was likely due to the fact that the BIOS only enumerates the first 12 disks and this machine has more than that in the root zpool which was a striped raidz2 volume. This in turn means that the bootcode can't complete and hence the machine can't boot. Our solution was to migrate the root fs off the raidz2 volume and to a mirrored volume which was on two disks which where accessible from the BIOS. It would of course be nice if zfs warned or even prevented this, any thoughts? More info available if we find it here:- http://blog.multiplay.co.uk/2012/01/zfs-io-error-all-block-copies-unavailable-on-large-disk-number-machines/ Regards Steve ================================================ This e.mail is private and confidential between Multiplay (UK) Ltd. and the person or entity to whom it is addressed. In the event of misdirection, the recipient is prohibited from using, copying, printing or otherwise disseminating it or any information contained in it. In the event of misdirection, illegible or incomplete transmission please telephone +44 845 868 1337 or return the E.mail to postmaster@multiplay.co.uk.
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