Hi,
we are testing ZFS atm as a possible replacement for Veritas VM.
While testing, we encountered a serious problem, which corrupted the whole filesystem.
First we created a standard Raid10 with 4 disks.
[b]NODE2:../# zpool create -f swimmingpool mirror c0t3d0 c0t11d0 mirror c0t4d0 c0t12d0
NODE2:../# zpool list
NAME SIZE USED AVAIL CAP HEALTH ALTROOT
swimmingpool 33.5G 81K 33.5G 0% ONLINE -
NODE2:../# zpool status
pool: swimmingpool
state: ONLINE
scrub: none requested
config:
NAME STATE READ WRITE CKSUM
swimmingpool ONLINE 0 0 0
mirror ONLINE 0 0 0
c0t3d0 ONLINE 0 0 0
c0t11d0 ONLINE 0 0 0
mirror ONLINE 0 0 0
c0t4d0 ONLINE 0 0 0
c0t12d0 ONLINE 0 0 0
errors: No known data errors
[/b]
After that we made a new ZFS and copied a testing file on it.
[b]NODE2:../# zfs create swimmingpool/babe
NODE2:../# zfs list
NAME USED AVAIL REFER MOUNTPOINT
swimmingpool 108K 33.0G 25.5K /swimmingpool
swimmingpool/babe 24.5K 33.0G 24.5K /swimmingpool/babe
NODE2:../# cp /etc/hosts /swimmingpool/babe/
[/b]
Now we test the behaviour if importing the ZFS on another system while it is still imported on the first one.
The expected behaviour would be that ZFS couldn't be imported due to possible corruption, but instead it is imported just fine!
We now were able to write simultanously from both systems on the same ZFS:
[b]NODE1:../# zpool import -f swimmingpool
NODE1:../# man man > /swimmingpool/babe/man
NODE2:../# cat /dev/urandom > /swimmingpool/babe/testfile &
NODE1:../# cat /dev/urandom > /swimmingpool/babe/testfile2 &
NODE1:../# ls -l /swimmingpool/babe/
-r--r--r-- 1 root root 2194 Sep 8 14:31 hosts
-rw-r--r-- 1 root root 17531 Sep 8 14:52 man
-rw-r--r-- 1 root root 3830447920 Sep 8 16:20 testfile2
NODE2:../# ls -l /swimmingpool/babe/
-r--r--r-- 1 root root 2194 Sep 8 14:31 hosts
-rw-r--r-- 1 root root 3534355760 Sep 8 16:19 testfile
[/b]
This can't be supposed to be the normal behaviour.
Did we encounter a bug or is this still under development?
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