I've just been trying to simulate a raidz array and
see if I can generate some CKSUM errors at the upper-levels,
by corrupting a single (virtual) drive.
But so far I've not had any success.
See below.
Does anyone know the type/pattern of corruption that
would cause upper-level CKSUM errors?
Thanks
Nigel Smith
# mkfile 128m /vdev/disk1
# mkfile 128m /vdev/disk2
# mkfile 128m /vdev/disk3
# zpool create test-raidz raidz1 /vdev/disk1 /vdev/disk2 /vdev/disk3
# zpool status test-raidz
pool: test-raidz
state: ONLINE
scrub: none requested
config:
NAME STATE READ WRITE CKSUM
test-raidz ONLINE 0 0 0
raidz1 ONLINE 0 0 0
/vdev/disk1 ONLINE 0 0 0
/vdev/disk2 ONLINE 0 0 0
/vdev/disk3 ONLINE 0 0 0
errors: No known data errors
# zfs create test-raidz/data
# cp -pr /usr/share/ghostscript/ /test-raidz/data
# zpool list test-raidz
NAME SIZE USED AVAIL CAP HEALTH ALTROOT
test-raidz 370M 47.4M 323M 12% ONLINE -
# zfs list -r test-raidz
NAME USED AVAIL REFER MOUNTPOINT
test-raidz 31.5M 183M 28.0K /test-raidz
test-raidz/data 31.3M 183M 31.3M /test-raidz/data
# dd if=/dev/urandom of=/vdev/disk2 bs=1024k count=64 conv=notrunc
64+0 records in
64+0 records out
# zpool scrub test-raidz
# zpool status test-raidz
pool: test-raidz
state: DEGRADED
status: One or more devices has experienced an unrecoverable error. An
attempt was made to correct the error. Applications are unaffected.
action: Determine if the device needs to be replaced, and clear the errors
using 'zpool clear' or replace the device with 'zpool replace'.
see: http://www.sun.com/msg/ZFS-8000-9P
scrub: scrub completed after 0h0m with 0 errors on Tue Jul 21 23:50:33 2009
config:
NAME STATE READ WRITE CKSUM
test-raidz DEGRADED 0 0 0
raidz1 DEGRADED 0 0 0
/vdev/disk1 ONLINE 0 0 0
/vdev/disk2 DEGRADED 0 0 1.19K too many errors
/vdev/disk3 ONLINE 0 0 0
errors: No known data errors
# zpool clear test-raidz
# zpool status test-raidz
pool: test-raidz
state: ONLINE
scrub: scrub completed after 0h0m with 0 errors on Tue Jul 21 23:50:33 2009
config:
NAME STATE READ WRITE CKSUM
test-raidz ONLINE 0 0 0
raidz1 ONLINE 0 0 0
/vdev/disk1 ONLINE 0 0 0
/vdev/disk2 ONLINE 0 0 0 15.7M repaired
/vdev/disk3 ONLINE 0 0 0
errors: No known data errors
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