If you encounter the problem de/assigning hardware from a LPAR with the HMC and get the error “no communication to LPAR possible” restart the IBM.DRM Service on the LPAR.
[/usr/sbin/rsct/bin]# ./rmcctrl -k
0513-044 The ctrmc Subsystem was requested to stop.
[/usr/sbin/rsct/bin]# ./rmcctrl -a
0513-071 The ctrmc Subsystem has been added.
[/usr/sbin/rsct/bin]# ./rmcctrl -s
That´s it, the communication should be reestablished.
If this does not help, use /usr/sbin/rsct/install/bin/recfgct and wait atleast 5 minutes.
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