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@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@xen-727057 ~]# pvs &
[1] 4561
[root@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@xen-727057 ~]# gnbd_import -n -R
gnbd_import: ERROR cannot disconnect device #0 : Device or resource busy
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