device file name of the cluster lock disk

[Alberto Hurtado]

I have a cluster of two nodes and one package with a Storage EMC Symmetrix. Therefore my disc of look this lost, I can repair this situation and to connect the server to another port of the EMC.

But the question is, i cant change the name c_t_d_ of device file in the .cfg file only halting the cluster changing the file and restating the cluster and pkg ?

[melvyn burnard · Accepted solution]

If your question is:
Must I halt the cluster to change the cluster lock disk device name in the cluster, the answer is YES, you must do this and re-apply the cluster binary with cmapplyconf.

[Matti_Kurkela]

You are correct.

The ServiceGuard manual is very clear on this:
http://docs.hp.com/en/B3936-90100/ch07s04.html

Table 7-1 lists various kinds of changes to the cluster configuration and the required state for each.

"Change Cluster Lock Configuration - Cluster must not be running."

If you're running a 24/7/365 operation and need to make storage configuration changes, cluster lock disks are a big pain.

You can change the ASCII configuration file any time you wish - but to make the change take effect, you must run cmapplyconf. If the cluster is running and the lock disk path has changed, the cmapplyconf will not make the change.

There is an alternative: set up a Quorum Server and use it instead of a lock disk.

With QS, redundant SAN connections and some use of MirrorDisk/UX, you can migrate the cluster from old storage to new with no downtime at all.