[Linux-cluster] How to recover from gnbd "Open Disconnected Pending" state?

[Benjamin Marzinski]

On Fri, Apr 03, 2009 at 06:00:56PM +0800, Kirby Zhou wrote:
> How to recover from gnbd "Open Disconnected Pending" state?
> 
> When the machine which exported gnbd is broken or shutdown, the client
> machine would fall into the state 'Open Disconnected Pending'.
> Any process accessing the dead gnbd will fall into state 'D'. 
> How can I remove the dead gnbd block device on the client machine?
> 
> #On the client machine
> [root at xen-727057 ~]# gnbd_import -n -l
> Device name : 63.131.xvdb
> ----------------------
>     Minor # : 0
>  sysfs name : /block/gnbd0
>      Server : 10.10.63.131
>        Port : 14567
>       State : Open Disconnected Pending
>    Readonly : No
>     Sectors : 16777216
> 
> [root at xen-727057 ~]# pvs &
> [1] 4561
> [root at xen-727057 ~]# ps aux | fgrep pvs
> root      4561  0.6  0.1  79364  1544 pts/0    D    14:50   0:00 pvs
> root      4563  0.0  0.0  61112   608 pts/0    S+   14:50   0:00 fgrep pvs
> 
> [root at xen-727057 ~]# gnbd_import -n -R
> gnbd_import: ERROR cannot disconnect device #0 : Device or resource busy

Did you try

#gnbd_import -n -RO

The override option should allow you to remove the device and fail the
IO.

-Ben