Hello!
I've got a Solaris 10 10/08 Sparc system and use ZFS pool version 15. I'm
playing
around a bit to make it break.
I've created a mirrored "Test" pool using mirrored log devices:
# zpool create Test \
mirror /dev/zvol/dsk/data/DiskNr1 /dev/zvol/dsk/data/DiskNr2 \
log mirror /dev/zvol/dsk/data/LogMirrorDev1
/dev/zvol/dsk/data/LogMirrorDev2
Now I write some garbage to one of the log mirror devices.
# dd if=/dev/urandom of=/dev/zvol/dsk/data/LogMirrorDev2 bs=1024
count=100000
Now I'm checking the status:
# zpool status -v Test
pool: Test
state: ONLINE
scrub: none requested
config:
NAME STATE READ WRITE CKSUM
Test ONLINE 0 0 0
mirror ONLINE 0 0 0
/dev/zvol/dsk/data/DiskNr1 ONLINE 0 0 0
/dev/zvol/dsk/data/DiskNr2 ONLINE 0 0 0
logs
mirror ONLINE 0 0 0
/dev/zvol/dsk/data/LogMirrorDev1 ONLINE 0 0 0
/dev/zvol/dsk/data/LogMirrorDev2 ONLINE 0 0 0
errors: No known data errors
No error? Because th in-memory data is still correct? Let's export and
import it, which should clear this, right?
# zpool export Test
# zpool import -d /dev/zvol/dsk/data -a
# zpool status -v Test
pool: Test
state: ONLINE
scrub: none requested
config:
NAME STATE READ WRITE CKSUM
Test ONLINE 0 0 0
mirror ONLINE 0 0 0
/dev/zvol/dsk/data/DiskNr1 ONLINE 0 0 0
/dev/zvol/dsk/data/DiskNr2 ONLINE 0 0 0
logs
mirror ONLINE 0 0 0
/dev/zvol/dsk/data/LogMirrorDev1 ONLINE 0 0 0
/dev/zvol/dsk/data/LogMirrorDev2 ONLINE 0 0 0
errors: No known data errors
Still no error? Do I need to scrub first?
# sudo zpool scrub Test ; sleep 5 ; zpool status -v Test
pool: Test
state: ONLINE
scrub: scrub completed after 0h0m with 0 errors on Fri Nov 12 15:20:26 2010
config:
NAME STATE READ WRITE CKSUM
Test ONLINE 0 0 0
mirror ONLINE 0 0 0
/dev/zvol/dsk/data/DiskNr1 ONLINE 0 0 0
/dev/zvol/dsk/data/DiskNr2 ONLINE 0 0 0
logs
mirror ONLINE 0 0 0
/dev/zvol/dsk/data/LogMirrorDev1 ONLINE 0 0 0
/dev/zvol/dsk/data/LogMirrorDev2 ONLINE 0 0 0
errors: No known data errors
Hm. Why are there no errors shown for the logs devices?
Thanks a lot,
Alexander
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