On Thu, 21 Oct 2010 14:01:09 +0200, Matthew Seaman
<m.sea...@infracaninophile.co.uk> wrote:
Dear all,
I'm happy that gptzfsloader will work with just about any zpool
configuration you could imagine, but...
We have an HP DL185 G5 with a P400 raid array, fully populated with 12
drives. Since there's no JBOD mode (or at least, not one you can get to
from the BIOS configuration screens), the array is configured as 12
single disk RAID0 arrays. As I posted about previously, we had FreeBSD
8.1-STABLE installed on a 6 disk raidz1, and everything was happy.
However, we were having some difficulty adding a second vdev -- another
raidz1 using the other 6 drives.
Well, to cut a long story short: eventually we did this by hot-plugging
disks 7 -- 12 after FreeBSD was up and running. Everything was cool and
dandy, and we had the server running on all drives after setting up gpt
partition tables and doing a 'zpool add'.
Until we tested rebooting.
On attempted reboot, the loader reported 8 drives, and subsequently ZFS
flailed with the dreaded "ZFS: i/o error - all block copies unavailable"
error. Now, we've had a poke through FreeBSD sources, and as far as we
can tell, FreeBSD will work with up to 31 devices being reported from
the BIOS. Is this correct, and the limitation is in what the hardware
is reporting to the loader at the early stages of booting?
Any good tricks for getting round this sort of limitation? Our current
plan is to set up a USB memstick with /boot on it, by adapting the
instructions here: http://wiki.freebsd.org/RootOnZFS/UFSBoot -- which
isn't ideal as the memstick will be a single point of failure.
I think I've encountered the same problem as you. In my configuration
there is also HP server with HP SmartArray with six disks configured as
single disk RAID0 logical units. I don't think it is related to size of
the pool (try to test with small GPT partitions -- for me it also doesn't
work). I think it is something with this specific hardware and ZFS. I will
provide more details soon, but for know could you test following
configurations:
- mirror (it works for me),
- raidz(2) (it doesn't work for me),
- raidz(2) but without SmartArray controller -- adX or adaX disks (it
works for me).
Please try 'status' command while seeing "ZFS: i/o error..." message.
--
am
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