----- Original Message ----- From: "Daniel O'Connor" <[email protected]>
Hi all,
I'm trying to setup a ZFS mirror system with a USB disk as backup. The backup 
disk is a ZFS pool which I am zfs send'ing to.

However I find that if the disk is disconnected while mounted then things go 
pear shaped..
root@gateway:~ # zpool status -v
  pool: backupA
 state: UNAVAIL
status: One or more devices are faulted in response to IO failures.
action: Make sure the affected devices are connected, then run 'zpool clear'.
   see: http://illumos.org/msg/ZFS-8000-HC
  scan: none requested
config:

 NAME          STATE     READ WRITE CKSUM
 backupA       UNAVAIL      0     0     0
   1877640355  REMOVED      0     0     0  was /dev/da0

errors: List of errors unavailable (insufficient privileges)

(but I am root..)

root@gateway:~ # zpool online pool /dev/da0
cannot online /dev/da0: no such device in pool

?!

Anyone have any ideas?

First "pool" is not your pool name its backupA so try:
zpool online backupA /dev/da0

If that still fails try:
zpool online backupA 1877640355

   Regards
   Steve

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