dlpar not working between from hmc

Usually, if DLPAR fails due to below reason, its always problem with the rmc connection, which depends on RSCT daemons.

Error :

"A RMC network connection to the partition is not present. Verify the network settings on the partition and the HMC. If you select OK you will have to restart the partition for the resource changes to take effect."




Solution :

The very easy best thing, that we can do for making DLPAR to work is restart RMC along with the rsct group daemons, with the help of below three commands and wait for some 5 min, before you again test the dlpar capability.

# /usr/sbin/rsct/bin/rmcctrl -z
# /usr/sbin/rsct/bin/rmcctrl -A
# /usr/sbin/rsct/bin/rmcctrl -p

# lssrc -a | grep rsct
 

  - IBM.DRM should be in active state

Go back to the HMC restricted shell command prompt

# lspartition -dlpar
the partition shows correct hostname & IP
Active<1> and Decaps value 0x3f

The above values mean that the partition is capable of a dlpar operation.

If above things don`t work even you wait for 5 to 10 min, please execute the above commands followed by the recfgct command. Below is the command.

 
/usr/sbin/rsct/install/bin/recfgct

Wait for sometime and give a try. It should work for sure if the problem is with the RMC, rsct related otherwise the problem may be because of firewall between your hmc and the server.