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Date:      Sun, 13 Oct 2013 17:02:47 +0100
From:      "Steven Hartland" <killing@multiplay.co.uk>
To:        "Daniel O'Connor" <doconnor@gsoft.com.au>, "freebsd-stable stable" <freebsd-stable@freebsd.org>
Subject:   Re: ZFS hanging on too hard
Message-ID:  <CBCD216C18564275A96FF213AA1FDA91@multiplay.co.uk>
References:  <0A1B986B-1D7D-4D88-82EF-C1E7A91FF089@gsoft.com.au>

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----- Original Message ----- 
From: "Daniel O'Connor" <doconnor@gsoft.com.au>
> 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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