topic Re: Replace the NICs in a SG node in Operating System - HP-UX

Replace the NICs in a SG node

Jdamian — Fri, 27 Jun 2008 10:18:42 GMT

Hi

I have to replace 4 NICs in a cluster node but I'm not sure if I must:

A. stop the entire cluster in order to reconfig
B. remove the node from the cluster and add back later.
C. just take out temporary the node from the cluster (i.e., cmnodehalt) and take in later (cmruncl -n)

The current NICs are 10/100 Mbps and the new ones are 1 Gbps. The MAC address will be different.

What do you think?

Thanx in advance

Re: Replace the NICs in a SG node

Ivan Krastev — Fri, 27 Jun 2008 11:33:02 GMT

Hello Oscar,

Just stop the node (cmhaltnode) and change the cards.

Prevent cluster software fron starting automatically on that node, check for new PPA # to be the same as the previous ones and chnage it if necessary.

After that run node and enable cluster auto run.

regards,
ivan

Re: Replace the NICs in a SG node

Steven E. Protter — Fri, 27 Jun 2008 11:58:31 GMT

Shalom,

If you can stop the cluster A is easiest.
B is probably what you will do otherwise why would you be running serviceguard. C is essentially equivalent.

You will most likely need to make adjustments to your configuration and run cmquerycl/cmcheckconf/cmapplyconf so I'd have at least a precautionary downtime scheduled for the user community.

SEP

Re: Replace the NICs in a SG node

melvyn burnard — Fri, 27 Jun 2008 16:34:27 GMT

Well as the cluster binary contains the MAC address of each card, if you replace ALL of the NIC's at once, it will not join the cluster.
You shoul ddelete the node from the cluster, make your changes, test the new NIC's, and then add the node back into the cluster using cmaaplyconf

You COULD do step C, but you would need to only change one or two cards (not all of the HEartbeatNIC's at once) then use cmapplyconf to modify the binary, then go back and add in the rest of the cards and repeat.
Step B is the best