rswwal...@gmail.com said:
> There is another type of failure that mirrors help with and that is
> controller or path failures. If one side of a mirror set is on one
> controller or path and the other on another then a failure of one will not
> take down the set.
>
> You can't get that with RAIDZn.
You can if you have a stripe of RAIDZn's, and enough controllers
(or paths) to go around. The raidz2 below should be able to survive
the loss of two controllers, shouldn't it?
Regards,
Marion
$ zpool status -v
pool: zp1
state: ONLINE
scrub: scrub completed after 7h9m with 0 errors on Mon Sep 14 13:39:03 2009
config:
NAME STATE READ WRITE CKSUM
bulk_zp01 ONLINE 0 0 0
raidz2 ONLINE 0 0 0
c0t1d0 ONLINE 0 0 0
c1t1d0 ONLINE 0 0 0
c4t1d0 ONLINE 0 0 0
c5t1d0 ONLINE 0 0 0
c6t1d0 ONLINE 0 0 0
c7t1d0 ONLINE 0 0 0
raidz2 ONLINE 0 0 0
c0t2d0 ONLINE 0 0 0
c1t2d0 ONLINE 0 0 0
c4t2d0 ONLINE 0 0 0
c5t2d0 ONLINE 0 0 0
c6t2d0 ONLINE 0 0 0
c7t2d0 ONLINE 0 0 0
raidz2 ONLINE 0 0 0
c0t3d0 ONLINE 0 0 0
c1t3d0 ONLINE 0 0 0
c4t3d0 ONLINE 0 0 0
c5t3d0 ONLINE 0 0 0
c6t3d0 ONLINE 0 0 0
c7t3d0 ONLINE 0 0 0
raidz2 ONLINE 0 0 0
c0t4d0 ONLINE 0 0 0
c1t4d0 ONLINE 0 0 0
c4t4d0 ONLINE 0 0 0
c5t4d0 ONLINE 0 0 0
c6t4d0 ONLINE 0 0 0
c7t4d0 ONLINE 0 0 0
raidz2 ONLINE 0 0 0
c0t5d0 ONLINE 0 0 0
c1t5d0 ONLINE 0 0 0
c4t5d0 ONLINE 0 0 0
c5t5d0 ONLINE 0 0 0
c6t5d0 ONLINE 0 0 0
c7t5d0 ONLINE 0 0 0
raidz2 ONLINE 0 0 0
c0t6d0 ONLINE 0 0 0
c1t6d0 ONLINE 0 0 0
c4t6d0 ONLINE 0 0 0
c5t6d0 ONLINE 0 0 0
c6t6d0 ONLINE 0 0 0
c7t6d0 ONLINE 0 0 0
raidz2 ONLINE 0 0 0
c0t7d0 ONLINE 0 0 0
c1t7d0 ONLINE 0 0 0
c4t7d0 ONLINE 0 0 0
c5t7d0 ONLINE 0 0 0
c6t7d0 ONLINE 0 0 0
c7t7d0 ONLINE 0 0 0
spares
c0t0d0 AVAIL
c1t0d0 AVAIL
c4t0d0 AVAIL
c7t0d0 AVAIL
errors: No known data errors
$
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