Volume group recommendations

If possible, for easier system management and better performance, the default volume group, rootvg, should consist of only the physical volume on which the operating system is initially installed.

Maintaining only operating systems in the rootvg is a good decision because operating system updates, reinstallations, and crash recovery can be accomplished without endangering user data. Updates and reinstallations can be done more quickly because only the operating system is included in the changes.

One or more other volume groups should be defined for the other physical volumes that hold the user data. Having user data in alternate volume groups allows easier exporting of that data to other systems.

Place a highly active file system on one disk and the log for that file system on another if the activity would generate a lot of log transactions. Cached devices (such as solid-state disks or disk arrays with write-cache) can provide for much better performance for log logical volumes (JFS log or database logs).