Some notes on RootOnZFS article in wiki
Robert Noland
rnoland at FreeBSD.org
Mon Dec 21 15:21:29 UTC 2009
On Mon, 2009-12-21 at 06:00 -0900, Mel Flynn wrote:
> Hi,
>
> yesterday went through the RootOnZFS (gpt mirror version) and here's a few
> notes:
> 1) You cannot use the install CD. It doesn't have a livefs and so you can
> never do the actual install in 2.2. The DVD will work and the USB image. I
> ended up using the livefs CD and the USB image, cause I didn't want to loose
> the work I already did.
> 2) `gpart set -a active -i 1 ad4' gave me 'active: device not configured'.
> This error isn't mentioned (debugflags didn't help) in the wiki nor the
> missing DIAGNOSTICS section in the gpart man page. In my case the system
> booted, but it's nice to know what the error means and whether you can ignore
> it.
This step *was* only required for some BIOS and I'm not sure that it
ever worked as above. Previously, I had to use fdisk to set the active
bit in the PMBR. In at least 7-STABLE+, installing bootcode via gpart
will set the active bit in the PMBR, so this step is never required.
robert.
> 3) By adding the swap partitions on the two mirrored disks to /etc/fstab top
> actually shows the sum of these as available swap. My expectation is/was that
> the swap would be mirrored and thus I'd have only the size of one swap
> partition. If this isn't the case, can I get by with 1 of the two since
> they're double the intended size or should one use 2 and thus create them half
> the intended size?
> 4) The given mount points have sane defaults, however, I use cvs to checkout
> the ports. It would be nice to have one example where data is already in a
> directory tree and how one can promote it to a zfs filesystem with special
> properties.
>
> Thanks to everyone contributing to this article and keeping it current, bar
> the installation media, everything was a breeze!
--
Robert Noland <rnoland at FreeBSD.org>
FreeBSD
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