Date: Mon, 21 Dec 2009 12:47:47 -0600 From: Scot Hetzel <swhetzel@gmail.com> To: Mel Flynn <mel.flynn+fbsd.current@mailing.thruhere.net> Cc: freebsd-current@freebsd.org Subject: Re: Some notes on RootOnZFS article in wiki Message-ID: <790a9fff0912211047w6e0ee46co420869f25a7a016d@mail.gmail.com> In-Reply-To: <200912210600.46044.mel.flynn%2Bfbsd.current@mailing.thruhere.net> References: <200912210600.46044.mel.flynn%2Bfbsd.current@mailing.thruhere.net>
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On 12/21/09, Mel Flynn <mel.flynn+fbsd.current@mailing.thruhere.net> 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.
I have updated the wiki to mention that you need an install media with
the livefs support.
> 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.
I had marked that step as optional, and as was stated in this thread
it is not needed for GPT disks. This optional step has been removed
from the wiki.
> 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?
To mirror the swap partitions, your will need to use gmirror.
1. comment out/remove the /dev/gpt/swap{0,1} entries
2. add geom_mirror_load="YES" to /boot/loader.conf
2. reboot to make sure the system is not using the swap partitions
3. create the mirrored swap partitions using the gpt/swap0 and
gpt/swap1 partitions:
gmirror label -b prefer swap gpt/swap0 gpt/swap1
NOTE: round-robin can also be used, but see the gmirror(8) man page
about kernel dumps.
4. change /etc/fstab to use the mirrored swap partition:
/dev/mirror/swap none swap sw
0 0
If you try this, let me know how it turns out.
Scot
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