A dedicated disk is created on hd8 for rootvg when the system is installed. You can also create a JFS log on a separate disk for other volume groups, as shown in the following procedure. You might want to do this to improve performance under certain conditions, for example, if you have an NFS server and you want the transactions for this server to be processed without competition from other processes. It is not required that it be empty except for the JFS log. After you set the fields, press Enter.
Nothing is destroyed despite the wording in the prompt.
In the Logical Volumes dialog screen, fill in the following fields with your data.