Hi Ragnar,
A bug might exist but you are building a pool based on the ZFS
volumes that are created in another pool. This configuration
is not supported and possible deadlocks can occur.
If you can retry this example without building a pool on another
pool, like using files to create a pool and can reproduce this,
then please let me know.
Thanks,
Cindy
On 12/01/09 17:57, Ragnar Sundblad wrote:
It seems that device names aren't always updated when importing
pools if devices have moved. I am not sure if this is only an
cosmetic issue or if it could actually be a real problem -
could it lead to the device not being found at a later import?
/ragge
(This is on snv_127.)
I ran the following script:
------------
#!/bin/bash
set -e
set -x
zfs create -V 1G rpool/vol1
zfs create -V 1G rpool/vol2
zpool create pool mirror /dev/zvol/dsk/rpool/vol1 /dev/zvol/dsk/rpool/vol2
zpool status pool
zpool export pool
zfs create rpool/subvol1
zfs create rpool/subvol2
zfs rename rpool/vol1 rpool/subvol1/vol1
zfs rename rpool/vol2 rpool/subvol2/vol2
zpool import -d /dev/zvol/dsk/rpool/subvol1
sleep 1
zpool import -d /dev/zvol/dsk/rpool/subvol2
sleep 1
zpool import -d /dev/zvol/dsk/rpool/subvol1 pool
zpool status pool
------------
And got the output below. I have annotated it with ### remarks.
------------
# bash zfs-test.bash
+ zfs create -V 1G rpool/vol1
+ zfs create -V 1G rpool/vol2
+ zpool create pool mirror /dev/zvol/dsk/rpool/vol1 /dev/zvol/dsk/rpool/vol2
+ zpool status pool
pool: pool
state: ONLINE
scrub: none requested
config:
NAME STATE READ WRITE CKSUM
pool ONLINE 0 0 0
mirror-0 ONLINE 0 0 0
/dev/zvol/dsk/rpool/vol1 ONLINE 0 0 0
/dev/zvol/dsk/rpool/vol2 ONLINE 0 0 0
errors: No known data errors
+ zpool export pool
+ zfs create rpool/subvol1
+ zfs create rpool/subvol2
+ zfs rename rpool/vol1 rpool/subvol1/vol1
+ zfs rename rpool/vol2 rpool/subvol2/vol2
+ zpool import -d /dev/zvol/dsk/rpool/subvol1
pool: pool
id: 13941781561414544058
state: DEGRADED
status: One or more devices are missing from the system.
action: The pool can be imported despite missing or damaged devices. The
fault tolerance of the pool may be compromised if imported.
see: http://www.sun.com/msg/ZFS-8000-2Q
config:
pool DEGRADED
mirror-0 DEGRADED
/dev/zvol/dsk/rpool/subvol1/vol1 ONLINE
/dev/zvol/dsk/rpool/vol2 UNAVAIL cannot open
### Note that it can't find vol2 - which is expected.
+ sleep 1
### The sleep here seems to be necessary for vol1 to magically be
### found in the next zpool import.
+ zpool import -d /dev/zvol/dsk/rpool/subvol2
pool: pool
id: 13941781561414544058
state: ONLINE
action: The pool can be imported using its name or numeric identifier.
config:
pool ONLINE
mirror-0 ONLINE
/dev/zvol/dsk/rpool/vol1 ONLINE
/dev/zvol/dsk/rpool/subvol2/vol2 ONLINE
### Note that it says vol1 is ONLINE, under it's old path, though it actually
has moved
+ sleep 1
+ zpool import -d /dev/zvol/dsk/rpool/subvol1 pool
+ zpool status pool
pool: pool
state: ONLINE
scrub: none requested
config:
NAME STATE READ WRITE CKSUM
pool ONLINE 0 0 0
mirror-0 ONLINE 0 0 0
/dev/zvol/dsk/rpool/subvol1/vol1 ONLINE 0 0 0
/dev/zvol/dsk/rpool/vol2 ONLINE 0 0 0
errors: No known data errors
### Note that vol2 has it old path shown!
----------------------------
### Interestingly, if you then
+ zpool export pool
+ zpool import -d /dev/zvol/dsk/rpool/subvol2 pool
### vol2's path gets updated too:
+ zpool status pool
pool: pool
state: ONLINE
scrub: none requested
config:
NAME STATE READ WRITE CKSUM
pool ONLINE 0 0 0
mirror-0 ONLINE 0 0 0
/dev/zvol/dsk/rpool/subvol1/vol1 ONLINE 0 0 0
/dev/zvol/dsk/rpool/subvol2/vol2 ONLINE 0 0 0
errors: No known data errors
----------------------------
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