AIX

Hi there,

I've had a problem with DLPAR on one of our servers, it tells me there is no connection between the server and the HMC, so i've researched some websites and found a possible solution, it's to run the following commands
/usr/sbin/rsct/bin/rmcctrl -z
/usr/sbin/rsct/install/bin/recfgct
/usr/sbin/rsct/bin/rmcctrl -s

Now I have a little understanding of what these do but could someone please tell me in more detail as to what each command does and what it impacts?

Many Thanks

My understanding:

The RMC subsystem enables remote management. It is used in clustering, HA / SP / CSM systems and between the HMC and it managed LPARS.

RMC can get confused for several reasons, like changing the hostname, installing LPARS using a cloned mksysb, etc.

The RMC key should be unique and created once the system is installed and configured.
The key is generated from, amongst other things, the hostname.

Of course the key is recreated during mksysb install but then when you customise the install (change the hostname for instance) it breaks the key.

/usr/sbin/rsct/install/bin/recfgct
Should recreate the key and cycle the RMC sybsystem.

I think the other commands are used to stop and then start the subsystem but I believe the /usr/sbin/rsct/install/bin/recfgct command should do this as it recreates the key.

The impact seems to be zero, the benefit seems to be that things like DLPAR start working again.

Depending on how the HMC and LPARS have been installed / configured you may need to run the commands on all LPARS and the HMC for things like DLPAR to burst into life.

http://publib.boulder.ibm.com/infoce...l5tra0710.html

So your commands would stop the subsystem, regenerate the key and then start the subsystem.

I'd use the -p switch as well to ensure remote connections are enabled.