Date: Mon, 21 Dec 2009 15:27:26 -0900 From: Mel Flynn <mel.flynn+fbsd.current@mailing.thruhere.net> To: freebsd-current@freebsd.org Cc: Scot Hetzel <swhetzel@gmail.com> Subject: Re: Some notes on RootOnZFS article in wiki Message-ID: <200912211527.26116.mel.flynn%2Bfbsd.current@mailing.thruhere.net> 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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On Monday 21 December 2009 09:47:47 Scot Hetzel wrote:
> I have updated the wiki to mention that you need an install media with
> the livefs support.
<snip>
> 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.
Great work, thanks!
> > 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.
Works as advertised:
% swapinfo -h
Device 1K-blocks Used Avail Capacity
/dev/mirror/swap 4194300 0B 4.0G 0%
% gmirror status
Name Status Components
mirror/swap COMPLETE ad4p2
ad6p2
Thanks for your work and advice!
--
Mel
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