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Adding Disk Space to an Existing Diskset (With Solaris 9 OS)

Karan Grover, January 2008

The following procedure provides steps for adding a LUN to an existing diskset in a cluster environment and then growing the logical volume.

This procedure was done using the Solaris 9 Operating System with a generic patch revision level of 117171-02 and Sun Cluster 3.1 software.

Caution: If you plan to use this procedure in a live cluster database environment, before you perform the procedure, make a complete backup of the file system in which you will implement the change.

1. Capture the output of the format command before adding the LUN.

2. Make the LUN visible to the server by running devfsadm -v on all cluster nodes.

3. Capture the output of the format command after adding the LUN.

4. Compare and format outputs to identify the new LUN.

5. On all the cluster nodes, run the scgdevs command to make the LUN visible to the global configuration for the cluster.

6. Run the following command to get the LUN name with the metadevice name of the new LUN:

#scdidadm -L |grep LUN

7. Run the format command, select label, and label the new LUN using the information you obtained in the previous step.

8. Run the following command to add the disk to the current device set and make the change visible on all nodes:

#metaset -s <setname> -a <diskname> -h <hostnames>

9. On all nodes, run the metaset command to confirm that the new disk has been added.

10. Run the following command to attach the LUN to the block device:

#metattach -s <setname> <disk number on which the file
system is mounted> <slice that has the free space>

11. Run the following command to grow the logical file system without destroying its contents:

#growfs -M /<fsname> /rdisk <name>

Important Note: Stop all database or application writes to the affected file system before issuing the growfs command. The growfs command issues a momentary lockfs while it is expanding the file system. Database or application writes will be blocked during that brief time. Any DB or app that is especially busy may stop working if it is sensitive to such a stoppage.

Note: In the /etc/vfstab file, you can find the name of the raw disk device that is associated with the logical disk partition you are growing.

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