Date: Sun, 09 Jan 2011 08:44:55 +0000 From: Matthew Seaman <m.seaman@infracaninophile.co.uk> To: freebsd-stable@freebsd.org Subject: Re: ZFS - moving from a zraid1 to zraid2 pool with 1.5tb disks Message-ID: <4D297587.4030108@infracaninophile.co.uk> In-Reply-To: <m262ty39th.wl%randy@psg.com> References: <4D1C6F90.3080206@my.gd> <ifsia5$5ub$2@dough.gmane.org> <4D21E679.80002@my.gd> <84882169-0461-480F-8B4C-58E794BCC8E6@my.gd> <BEBC15BA440AB24484C067A3A9D38D7E0149F32D13E3@server7.acsi.ca> <m262ty39th.wl%randy@psg.com>
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[-- Attachment #1 --]
On 09/01/2011 05:50, Randy Bush wrote:
> given i have raid or raidz1, can i move to raidz2?
>
> # zpool status
> pool: tank
> state: ONLINE
> scrub: none requested
> config:
>
> NAME STATE READ WRITE CKSUM
> tank ONLINE 0 0 0
> raidz1 ONLINE 0 0 0
> ad4s2 ONLINE 0 0 0
> ad8s2 ONLINE 0 0 0
> ad6s1 ONLINE 0 0 0
> ad10s1 ONLINE 0 0 0
>
> or
>
> # zpool status
> pool: tank
> state: ONLINE
> scrub: none requested
> config:
>
> NAME STATE READ WRITE CKSUM
> tank ONLINE 0 0 0
> mirror ONLINE 0 0 0
> label/disk01 ONLINE 0 0 0
> label/disk00 ONLINE 0 0 0
> mirror ONLINE 0 0 0
> label/disk02 ONLINE 0 0 0
> label/disk03 ONLINE 0 0 0
Not without backing up your current data, destroying the existing
zpool(s) and rebuilding from scratch.
Note: raidz2 on 4 disks doesn't really win you anything over 2 x mirror
pairs of disks, and the RAID10 mirror is going to be rather more performant.
Cheers,
Matthew
--
Dr Matthew J Seaman MA, D.Phil. 7 Priory Courtyard
Flat 3
PGP: http://www.infracaninophile.co.uk/pgpkey Ramsgate
JID: matthew@infracaninophile.co.uk Kent, CT11 9PW
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