Configuring new disks on AIX cluster Post: 302267244

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Operating Systems AIX Configuring new disks on AIX cluster Post 302267244 by shockneck on Friday 12th of December 2008 02:33:43 AM

12-12-2008

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Quote:

Originally Posted by dnicky

[...]what will happen if the two new disks are not configured i.e. PVIDs are not created using chdev command on the secondary node before starting the cluster services on the primary node?
I guess, obviously the fail over to the secondary node will fail as the cluster services won't be able to access the new disks. In this scenario, will it be ok to create the PVIDs for the new disks on the secondary node and then subsequently fail over to the secondary node?

You are right both with your assumption about what whould happen and that you need to make the PVIDs known to secondary before you could proceed. I don't know which HACMP version you use. Regardless of the version the following procedure should work: make the PVID visible, then update the VG information on secondary while HACMP is stopped (by a Learning Import), then verify and sychcronise the Cluster.

If you are curious you could try to verify/sync the cluster with the autocorrection flag activated after assigning the PVID but before the manual import to find out if there was a chance that the cluster would resolve the problem on its own. I did not try this with current HACMP version but saw some enhancements in 5.4.1 compared to earlier versions that make me think that it might be possible now. When you are below version 5.3 forget it.

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4s-backend-setup

4S-BACKEND_SETUP(1J)						      4store						      4S-BACKEND_SETUP(1J)

NAME

     4s-backend-setup -- Create a new 4store KB

SYNOPSIS

     4s-backend-setup kbname [--node node-number] [--cluster cluster-size] [--segments segment-count] kb-name

		      --node  Number of this node in the cluster, values range from 0 to cluster-size - 1.  The default is 0.

		      --cluster
			      The number of nodes in the cluster.  The default is 1.

		      --segments
			      The number of segments in the cluster. The default is 2. We recommend one for each CPU core in the cluster as a good
			      starting point. Higher numbers tend to consume more resources, but may result in increased performance.

NOTES

     Once crated with 4s-backend-setup KBs should be started with 4s-backend(1)

SEE ALSO

     4s-query(1), 4s-size(1), 4s-httpd(1), 4s-backend(1), 4s-delete-model(1)

EXAMPLES

     $ 4s-backend-setup --node 0 --cluster 1 --segments 4 demo

     Creates the indexes for a single-machine KB with four segments, named "demo".

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