The machine which exported gnbd is power off. The client machine fall into
the state 'Open Disconnected Pending'.
Any process access the dead gnbd fall into state 'D'.
How can I destroy the gnbd block device on the client machine?
[r...@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
[r...@xen-727057 ~]# pvs &
[1] 4561
[r...@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
[r...@xen-727057 ~]# gnbd_import -n -R
gnbd_import: ERROR cannot disconnect device #0 : Device or resource busy
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