Paul B. Henson wrote:
> Historically I've used hardware raid1 for the boot disks on my servers.
> With the availability of ZFS root, I want to explore making the two
> underlying drives directly available to the operating system and create a
> ZFS mirror to avail of error detection and self-healing.
>
> The current openSolaris installer, when given an entire disk, partitions
> it into two slices: s0 for the ZFS pool, and s1 for swap.
>
This is because OpenSolaris 2008.05 is based on NV b86 which does not
have the fix for
5008936 ZFS and/or zvol should support dumps
5070124 dumpadm -d /dev/... does not enforce block
device requirement for savecore
6633197 zvol should not permit newfs or createpool while
it's in use by swap or dump
which were integrated into NV b88 as part of ZFS boot support,
http://opensolaris.org/os/community/on/flag-days/pages/2008041103
As they say, timing is everything...
-- richard
> Once the system is installed, I could add the second disk as a mirror,
> giving redundancy for the pool, but that would leave swap as a single point
> of failure.
>
> I investigated using a ZFS zvol for swap, which appears to be a viable
> option, but based on what I read you could not use a ZFS zvol for a dump
> device.
>
> The dumpadm man page under openSolaris says:
>
> "For systems with a ZFS root file system, dedicated ZFS volumes are used
> for swap and dump areas. For further information about setting up a dump
> area with ZFS, see the ZFS Administration Guide."
>
> However, the actual documentation
> ahttp://docs.sun.com/app/docs/doc/819-5461/gaypf?l=en' says "Using a ZFS
> volume as a dump device is not supported."
>
> That is Solaris 10 documentation, though. Can openSolaris actually use a
> ZFS zvol for dump?
>
> A somewhat related question, I was trying to determine the best way to
> convert the default install into the disk layout I want.
>
> For ZFS root, is it required to have a partition and slices? Or can I just
> give it the whole disk and have it write an EFI label on it?
>
> I know you cannot remove disks currently from a pool, but you can swap out
> devices, correct? So can I swap in the second disk (either the whole disk,
> or the overlap partition of a legacy labeled disk) to replace the initial
> installation disk, and then attach the original disk again as the second
> half of the mirror (again either the entire disk, or the overlap slice)?
>
>
>
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