ZVOL/istgt wrong placed on disk

[Tom Evans]

On Mon, Dec 2, 2013 at 11:01 AM, Johan Kooijman <mail at johankooijman.com> wrote:
> Hi all,
>
> The issue I'm having is the same as discussed over here:
> http://freebsd.1045724.n5.nabble.com/zvol-and-zfs-send-no-file-on-the-receiving-side-td5024476.html
> .
>
> I've added the zfs path to my istgt.conf config and are now stuck with this
> setup:
>
> [root at san-head1 ~]# zfs list
> NAME        USED  AVAIL  REFER  MOUNTPOINT
> tank       25.6T  4.74T  3.93T  /tank
> tank/fish  21.7T  26.4T    16K  -
>
> [root at san-head1 ~]# grep LUN0 /usr/local/etc/istgt/istgt.conf
>     LUN0                     Storage /tank/fish 21T

This is not a zvol, this is a file that istgt has created (as
requested). As per the link you originally gave, zvols are created in
/dev/zvol/<tank>/<fs>.

>
> [root at san-head1 ~]# ls -lh /tank/fish
> -rw-r--r--  1 root  wheel    21T Dec  2 11:57 /tank/fish
>
> Now.. it works, it exports to my virtualized setup, but I can't snapshot or
> anything. Is there a way to get this situation restored to the way it
> should be?
>

stop istgt
dd if=/tank/fish of=/dev/zvol/tank/fish
change the configuration file to point at the zvol not the file
rm /tank/fish
start istgt

Cheers

Tom