add disk space to volume

Due to Novell 5 server running out of disk space, I have to remove the online spare hd out of the current raid 5 configuration and added it back in to raid for more disk space (using compaq array card).
How do I tell Novell to add the extra disk space to the current volume set?
What do I have to do first?
please be specific as I am not familiar with Novell
ie
nwconfig
standard disk option

thanks