zfs and glabel

Hi all

I believe I'm having a few problems with using geom to label disks and then 
use them in zfs.

# zpool status rootzfs
  pool: rootzfs
 state: ONLINE
 scrub: none requested
config:

        NAME                 STATE     READ WRITE CKSUM
        rootzfs              ONLINE       0     0     0
          mirror             ONLINE       0     0     0
            label/sysdisk_A  ONLINE       0     0     0
            label/sysdisk_B  ONLINE       0     0     0

errors: No known data errors


# glabel status
            Name  Status  Components
label/bootdisk_A     N/A  ad0s1a
    label/swap_A     N/A  ad0s1b
 label/sysdisk_A     N/A  ad0s1d
label/bootdisk_B     N/A  ad2s1a
    label/swap_B     N/A  ad2s1b
 label/sysdisk_B     N/A  ad2s1d

# gmirror status
          Name    Status  Components
mirror/swap_AB  COMPLETE  label/swap_A
                          label/swap_B

# swapinfo
Device          1K-blocks     Used    Avail Capacity
/dev/mirror/swap_AB   4194300   158224  4036076     4%

# mount -t ufs
/dev/label/bootdisk_A on /bootdirA (ufs, local)
/dev/label/bootdisk_B on /bootdirB (ufs, local)


As can be seen I have the boot disk set up with separate /boot partitions 
(independent of each other), mirrored swap and the rest of the root file 
system in zfs.

Currently I am watching the following appearing every second or two in the 
messages file:
kernel: vdev_geom_detach:177[1]: Closing access to label/sysdisk_B.
kernel: vdev_geom_detach:177[1]: Closing access to label/sysdisk_A.
kernel: vdev_geom_detach:181[1]: Destroyed consumer to label/sysdisk_A.
kernel: vdev_geom_detach:177[1]: Closing access to label/sysdisk_B.
kernel: vdev_geom_detach:181[1]: Destroyed consumer to label/sysdisk_B.
kernel: vdev_geom_open:371[1]: Found provider by name /dev/label/sysdisk_A.
kernel: vdev_geom_attach:116[1]: Attaching to label/sysdisk_A.
kernel: vdev_geom_attach:157[1]: Created consumer for label/sysdisk_A.
kernel: vdev_geom_open:385[1]: ID match for provider /dev/label/sysdisk_A.
kernel: vdev_geom_open:371[1]: Found provider by name /dev/label/sysdisk_B.
kernel: vdev_geom_attach:116[1]: Attaching to label/sysdisk_B.
kernel: vdev_geom_attach:157[1]: Created consumer for label/sysdisk_B.
kernel: vdev_geom_open:385[1]: ID match for provider /dev/label/sysdisk_B.

much of the time only one disk is "lost" at a time.

I also get "kernel: ZFS WARNING: Cannot open ad2 for writting" (also for ad0) 
upon imports etc.

I'm running 7.0-RELEASE-p2  on amd64.

I also have another raidz set of 6 disks, but I don't use labels on them and 
have no messages as a result.

Any suggestions if I should be concerned or not.

I also have periodic lockups (under load) which I believe are zfs related, but 
I have only just set up the serial console and I am waiting to get a crash 
dump.

regards

Duncan