Date: Mon, 23 Jan 2012 20:47:55 -0000 From: "Steven Hartland" <killing@multiplay.co.uk> To: "Olivier Smedts" <olivier@gid0.org>, "Matthew Seaman" <m.seaman@infracaninophile.co.uk> Cc: freebsd-stable@freebsd.org Subject: Re: ZFS: i/o error - all block copies unavailable on large disk number machines Message-ID: <8270FFAE3BF447C380F5A414FFA9A9D2@multiplay.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> <CABzXLYNhiQJsMhFAsHorwpifDX1f_n5EhCL2yhQySg=QuksnvQ@mail.gmail.com>
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----- Original Message -----
From: Olivier Smedts
>> 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.
Out of interest whats the procedure you used for that Matthew?
> Have you tried using a separate /boot on a zfs with copies=2 (or the
> number of vdevs composing the pool) ?
Interesting idea but this assumes that the insertion of the new disks
doesn't affect the visability of the old disk. While this may sound
like it shouldn't happen I can see the case where this may well be
the case e.g. adding disks to a multi controller system where the
id's of the added disks are lower and hence preferenced by the
BIOS.
Regards
Steve
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