Date: Tue, 22 Dec 2009 11:02:06 +0000 From: krad <kraduk@googlemail.com> To: Scot Hetzel <swhetzel@gmail.com> Cc: Mel Flynn <mel.flynn+fbsd.current@mailing.thruhere.net>, freebsd-current@freebsd.org Subject: Re: Some notes on RootOnZFS article in wiki Message-ID: <d36406630912220302o5161dd50i45b69bd5003ad386@mail.gmail.com> In-Reply-To: <790a9fff0912211047w6e0ee46co420869f25a7a016d@mail.gmail.com> References: <200912210600.46044.mel.flynn%2Bfbsd.current@mailing.thruhere.net> <790a9fff0912211047w6e0ee46co420869f25a7a016d@mail.gmail.com>
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2009/12/21 Scot Hetzel <swhetzel@gmail.com>
> On 12/21/09, Mel Flynn <mel.flynn+fbsd.current@mailing.thruhere.net<mel.flynn%2Bfbsd.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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>
Are there still issues with using zvols for swap? If not you don't need a
slice for swap and can get rid of gmirror entirely.
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