illumos gate

I experienced some errors recently with the ZFS test suite. Specifically, functional/cli_root/zpool_expand/zpool_expand_001_pos would hang forever. Upon inspection, zpool destroy testpool1 was hanging because testpool1 had come to a stop:

  pool: testpool
 state: ONLINE
  scan: none requested
config:

        NAME        STATE     READ WRITE CKSUM
        testpool    ONLINE       0     0     0
          c4t0d0    ONLINE       0     0     0

errors: No known data errors

  pool: testpool1
 state: UNAVAIL
status: One or more devices could not be used because the label is missing 
        or invalid.  There are insufficient replicas for the pool to continue
        functioning.
action: Destroy and re-create the pool from
        a backup source.
   see: http://illumos.org/msg/ZFS-8000-5E
  scan: none requested
config:

        NAME                                  STATE     READ WRITE CKSUM
        testpool1                             UNAVAIL      0     0     0  insufficient replicas
          /dev/zvol/dsk/testpool/testfs/vol1  ONLINE       0     0     0
          /dev/zvol/dsk/testpool/testfs/vol2  UNAVAIL      0     0     0  corrupted data
          /dev/zvol/dsk/testpool/testfs/vol3  ONLINE       0     0     0

The only thing I could think of was an I/O error because the volume is in a pool (testpool, on one of the scratch disks) which is full. The pool was indeed nearly full. I increased the scratch disk size from 5GB to 10GB and the test completed successfully. I think in general the test suite should refuse to run with scratch disks smaller than 10GB.