Make sure that you have root privilege and that you have a current backup of all data.
Use one of the following methods to expand a mirror.
From the Enhanced Storage tool within the Solaris Management Console, open the Volumes node, choose the mirror, then choose Action->Properties and click the Submirrors tab. Follow the instructions on screen. For more information, see the online help.
Use the metattach command to attach additional slices to each submirror. For example, to attach a component to a submirror, use the following:
# metattach submirror component
Each submirror in a mirror must be expanded. See the metattach(1M) man page for more information.
# metastat d8: Mirror Submirror 0: d9 State: Okay Submirror 1: d10 State: Okay ... # metattach d9 c0t2d0s5 d9: component is attached # metattach d10 c0t3d0s5 d10: component is attached
An application, such as a database, that uses the raw volume must have its own way of growing the added space.