Hostname in Cluster OS V7.3-2

[Jees Joy]

Hi frenz

I am very new to Ovms, we have a 4 node cluster running in our test env, how can i change the hostname of a node. Which command will help me out to change the node name without affecting my cluster.

[Karl Rohwedder]

Jees,

check the app. chapter of the FAQ here:
http://h71000.www7.hp.com/faq/vmsfaq_007.html#mgmt9

Btw. the FAQ is always a good starting point...

regards Kalle

[Jan van den Ende]

Jees,

follow Kalle's lead to find the documentation.

However, as it is by no way a trivial procedure,

WHAT ARE YOU TRYING TO ACHIEVE?

If you must comply to some changed company standard, that is just it. Periood. Follow the docs.

But if you are only trying to make things friendlier for the user community, by making them connect to a frienlier name, there are MUCH easier (AND more friendly!) ways.

By what protocol are the connections made? DECnet, LAT, TELNET, or something else?

Assuming some IP-based protocol, you can assign many alias names. (In fact, the _NODE_ does not have an IP-name, but the network-interfaces have. If you have multiple interfaces in a node, each must have its own IP address (usually with a name) and you can assign the same CNAME to those.
In the same way, you can assign multiple CNAMES (say, the application names) to one, some, or all of the nodes (interfaces).
If you are using a DNS, the different translations of a name (ultimately: IP addresses) can be assigned in round-robin fashion, or by a METRIC-LOADBROAKER system. (just make sure the name-translation cache timeouts of any routers are set to tens of seconds, instead of the default 24 hours).

If we know more of tour real need, we will be better able to give more exact answers.

hth

Proost.

Have one on me.

jpe

[Jees Joy]

Hi JPe,

We are using TCP/IP lan, basically while installation we gave a hostname eg(kf1234), and we then joined the cluster, but later on we changed the SCSNODENAME in kf1234 from sysgen to MERC. AFter changing the SCSNODENAME, we took a reboot of the machine, after that he is not able to join the cluster. But he is able to ping to other machines/cluster memebers using TCP/IP.

[Jees Joy]

Hi JPe,

We are using TCP/IP lan/SCS, basically while installation we gave a hostname eg(kf1234), and we then joined the cluster, but later on we changed the SCSNODENAME in kf1234 from sysgen to MERC. AFter changing the SCSNODENAME, we took a reboot of the machine, after that he is not able to join the cluster. But he is able to ping to other machines/cluster memebers using TCP/IP.

[Jan van den Ende]

Jees,

if you ONLY changed SCSNODENAME, you MIGHT try to change it back. I never tried that, however. ( Anyone got a finite answer on this being possible or not? )
However, changing the nodeNAME without changing SCSSYSTEMID will definitely make the cluster refuse to accept the node, for "the cluster" (ie, every single member) knows all members and former members. A NAME<-> ID combination that conflicts with the known members will be refused.

You will probably have to choose a new name & a new ID (which means you must reconfigure DECnet etc per the info given by Kalle), OR, you must reboot the entire cluster. (Yacks!!, did _I_ write that??))

I would try to revert first, but NO PROMISSES!
Tell us the result, please?

Proost.

Have one on me.

jpe

[Peter Zeiszler]

That could just be having to update the licenses for the new name. Check that your licenses know what your new name is in the include portion.

[Jees Joy]

I cant afford restarting the whole cluster, but yes if I changed the scsnodename, i think it should change the scsid also automatically thats not happening anyway, but now trying to do what HP documents states which KARL posted, I surely post if I get something buddies. But please let me know if you get any other simple information

[Vladimir Fabecic]

Change SCSNODENAME and SCSSYSTEMID?
Maybe this:
>>> boot -flag 3,1 (3 is number of root and 1 is for sysboot)
SYSBOOT> set SCSNODENAME kf1234
SYSBOOT> set SCSSYSTEMID 7.200 (for example)
SYSBOOT> CONT