How to Create More Than Three Disksets in a Cluster

If you intend to create more than three disksets in the cluster, perform the following steps before you create the disksets. Follow these steps if you are installing disksets for the first time or if you are adding more disksets to a fully configured cluster.

1. Ensure that the value of the md_nsets variable is high enough. The value should accommodate the total number of disksets you intend to create in the cluster.

   1. On any node of the cluster, check the value of the md_nsets variable in the /kernel/drv/md.conf file.

   2. If the number of disksets in the cluster will be greater than the existing value of md_nsets minus one, increase the value of md_nsets on each node.

      The maximum permissible number of disksets is the value of md_nsets minus one. The maximum possible value of md_nsets is 32.

   3. Ensure that the /kernel/drv/md.conf file is identical on each node of the cluster.

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      Caution –

      Failure to follow this guideline can result in serious Solstice DiskSuite/Solaris Volume Manager errors and possible loss of data.

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   4. From one node, shut down the cluster.

      # scshutdown -g0 -y

   5. Reboot each node of the cluster.

      ok> boot

2. On each node in the cluster, run the devfsadm(1M) command.

   You can run this command on all nodes in the cluster at the same time.

3. From one node of the cluster, run the scgdevs(1M) command.

4. On each node, verify that the scgdevs command has completed before you attempt to create any disksets.

   The scgdevs(1M) command calls itself remotely on all nodes, even when the command is run from just one node. To determine whether the scgdevs command has completed processing, run the following command on each node of the cluster.

   % ps -ef | grep scgdevs