How to extend the volume

Solaris 9.0, YaY!

Ok, here is what you need to do:

You need one more disk. The reason why is because your original volume is mirrored. To extend a mirrored disk, you need to add two disks not one.

Now once you have another disk that is went through vxdisksetup, vxdg -g rootdg adddisk <diskname> and visible in vxprint, you just run:

vxassist -g rootdg maxgrow dctm

This will give the max size you can grow the volume to

Now you can refer to something like http://www.veritas.com/docs/100029279 if you have VxFS and it will be online, for other file systems you need to check whether the file system supports online resize

if memory serves me well, something like

vxresize -g rootdg dctm 106415296 alloc=rootdg03,rootdg04

should do the trick, provided it's VxFS and it is mounted