Hi
Was having a play with creating pools and whilst trying to create a 
mirror with two ide disks got the following:

paulj at opensolaris4:~$ pfexec zpool create newpool1 mirror c5d0 c5d1
invalid vdev specification
use '-f' to override the following errors:
/dev/dsk/c5d0s0 is part of exported or potentially active ZFS pool 
mypool1. Please see zpool(1M).

Looking at the disks available

paulj at opensolaris4:~$ pfexec format
Searching for disks...done


AVAILABLE DISK SELECTIONS:
       0. c4d0 <DEFAULT cyl 5001 alt 2 hd 255 sec 63>
          /pci at 0,0/pci-ide at 11,1/ide at 0/cmdk at 0,0
       1. c5d0 <ST380011-5JVS7DE-0001-74.53GB>
          /pci at 0,0/pci-ide at 11,1/ide at 1/cmdk at 0,0
       2. c5d1 <ST380011-5JVS5GH-0001-74.53GB>
          /pci at 0,0/pci-ide at 11,1/ide at 1/cmdk at 1,0
Specify disk (enter its number):


paulj at opensolaris4:~$ pfexec zpool list
NAME    SIZE   USED  AVAIL    CAP  HEALTH  ALTROOT
rpool  36.2G  11.9G  24.4G    32%  ONLINE  -

paulj at opensolaris4:~$ pfexec zpool  status mymirror1
cannot open 'mymirror1': no such pool

Or even:

paulj at opensolaris4:~$ pfexec zpool  status
  pool: rpool
 state: ONLINE
status: The pool is formatted using an older on-disk format.  The pool can
    still be used, but some features are unavailable.
action: Upgrade the pool using 'zpool upgrade'.  Once this is done, the
    pool will no longer be accessible on older software versions.
 scrub: none requested
config:

    NAME        STATE     READ WRITE CKSUM
    rpool       ONLINE       0     0     0
      c4d0s0    ONLINE       0     0     0

errors: No known data errors

Any ideas about this mypool1 and how to kill it safely?
I used the -f option and created the pool successfully but am rather 
curious.
The machine has been quite messed about and it's possible the disk c5d0 
may have been used in another config.

Regards Paul



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