On Oct 22, 2009, at 4:18, Ian Allison <i...@pims.math.ca> wrote:
Hi,
I've been looking at a raidz using opensolaris snv_111b and I've
come across something I don't quite understand. I have 5 disks
(fixed size disk images defined in virtualbox) in a raidz
configuration, with 1 disk marked as a spare. The disks are 100m in
size and I wanted simulate data corruption on one of them and watch
the hot spare kick in, but when I do
dd if=/dev/zero of=/dev/c10t0d0 ibs=1024 count=102400
The pool remains perfectly healthy
Try of=/dev/rdsk/c10t0d0s0 and see what happens
Victor
pool: datapool
state: ONLINE
scrub: scrub completed after 0h0m with 0 errors on Wed Oct 21
17:12:11 2009
config:
NAME STATE READ WRITE CKSUM
datapool ONLINE 0 0 0
raidz1 ONLINE 0 0 0
c10t0d0 ONLINE 0 0 0
c10t1d0 ONLINE 0 0 0
c10t2d0 ONLINE 0 0 0
c10t3d0 ONLINE 0 0 0
spares
c10t4d0 AVAIL
errors: No known data errors
I don't understand the output, I thought I should see cksum errors
against c10t0d0. I tried exporting/importing the pool and scrubbing
it incase this was a cache thing, but nothing changes.
I've tried this on all the disks in the pool with the same result
and the datasets in the pool is uncorrupted. I guess I'm
misunderstanding something fundamental about ZFS, can anyone help me
out and explain.
-Ian.
z
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