On Mar 25, 2010, at 22:10, Freddie Cash <fjwc...@gmail.com> wrote:
On Thu, Mar 25, 2010 at 11:47 AM, Bruno Sousa <bso...@epinfante.com>
wrote:
What do you mean by "Using fewer than 4 disks in a raidz2 defeats
the purpose of raidz2, as you will always be in a degraded mode" ?
Does it means that having 2 vdevs with 3 disks it won't be redundant
in the advent of a drive failure?
raidz1 is similar to raid5 in that it is single-parity, and requires
a minimum of 3 drives (2 data + 1 parity)
raidz2 is similar to raid6 in that it is double-parity, and requires
a minimum of 4 drives (2 data + 2 parity)
For any kind of RAID-Z as an absolute minimum you need one drive for
data and 1, 2 or 3 drives for parity.
IOW, a raidz2 vdev made up of 3 drives will always be running in
degraded mode (it's missing a drive)
No, it will not be degraded. You can easily check it with
mkfile -n 64m /var/tmp/1 /var/tmp/2 /var/tmp/3
zpool create rz2 raidz2 /var/tmp/[123]
zpool status rz2
Regards
Victor
--
Freddie Cash
fjwc...@gmail.com
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