Re: Seeing the dreaded "ZFS: i/o error - all block copies unavailable" on 9.0-CURRENT

From: Scot Hetzel <swhetzel_at_gmail.com>
Date: Wed, 17 Feb 2010 15:03:49 -0600
On Wed, Feb 17, 2010 at 12:40 PM, Pegasus Mc Cleaft <ken_at_mthelicon.com> wrote:
> Hello Chris, Scott & Current
>
>        I use gptzfsboot on my AMD64 (current) machine all the time and also on
> my laptop. I am not sure if this will cause the problem you are seeing but I
> know I ran into a lot of trouble depending on what type of pool I was
> creating.
>
>        I believe this is correct, and if I am not than I apologise in advance,
> but....
>
>        If you are trying to boot off a linear type pool (A single disk or a
> mirror) your bootable filing system has to be a zfs filing system beneath the
> root pool (IE: zroot/boot). If you are trying to boot off a zraid pool, your
> bootable filing system must be the root filing system of the pool (IE: zroot)
>
>        You must also include the appropriate declaration in the
> /boot/loader.conf file:
>
> (for a zraid pool)
> zfs_load="YES"
> vfs.root.mountfrom="zfs:zpool"
>
> (for a linear type)
> zfs_load="YES"
> vfs.root.mountfrom="zfs:zpool/root"
>
>        If I try any other method, zboot explodes in a myriad of different ways.
>

Not sure why your zboot explodes, but I use a single disk and only use
the following in /boot/loader.conf:

zfs_load="YES"
vfs.root.mountfrom="zfs:zpool"

it should work with either zfs:zpool or zfs:zpool/root.

Scot
Received on Wed Feb 17 2010 - 20:03:51 UTC

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