IBM SG24-5131-00 manual Adding Copies to Logical Volume on the Source Node

the journaled file system log (jfslog) is a logical volume that requires a unique name in the cluster.

To make sure that logical volumes have unique names, rename the logical volume associated with the file system and the corresponding jfslog logical volume. Use a naming scheme that indicates the logical volume is associated with a certain file system. For example, lvsharefs could name a logical volume for the /sharefs file system.

1.Use the lsvg -l volume_group_name command to determine the name of the logical volume and the log logical volume (jfslog) associated with the shared volume groups. In the resulting display, look for the logical volume name that has type jfs. This is the logical volume. Then look for the logical volume name that has type jfslog. This is the log logical volume.

2.Use the smit chlv fastpath to rename the logical volume and the log logical volume.

3.After renaming the jfslog or a logical volume, check the /etc/filesystems file to make sure the dev and log attributes reflect the change. Check the log attribute for each file system in the volume group, and make sure that it has the new jfslog name. Check the dev attribute for the logical volume that you renamed, and make sure that it has the new logical volume name.

Adding Copies to Logical Volume on the Source Node

Note

These steps do not apply to RAID devices, which provide their own mirroring of logical volumes.

1.Use the smit mklvcopy fastpath to add copies to a logical volume. Add copies to both the jfslog log logical volume and the logical volumes in the shared file systems. To avoid space problems, first mirror the jfslog log logical volume and then the shared logical volumes.

The copies should reside on separate disks that are controlled by different disk adapters and are located in separate drawers or units, if possible. See Chapter 3.4.3, “Mirroring Strategies” on page 86 for more information.

2.Verify the number of logical volume copies by entering: lsvg -l

volume_group_name. In the resulting display, locate the line for the logical volume for which you just added copies. Notice that the number in the physical partitions column is x times the number in the logical partitions column, where x is the number of copies.

3.To verify the placement of logical volume copies, enter: lspv -l hdiskx, where hdiskx is the name of each disk to which you assigned copies.

Cluster Hardware and Software Preparation 85