Solaris 10 with zfs root install and VMWare-How to grow disk?

Question

I have a Solaris 10 instance installed on an ESX host. During the install, I selected a 20gig disk. Now, I would like to grow the disk from 20GB to 25GB, I made the change on VMWare but now the issue seems to be Solaris. I haven't seen anything on how to grow the FS in Solaris. Someone mentioned using fdisk to manually change the number of cylinders but that seems awkward. I am using a zfs root install too.
bash-3.00# fdisk /dev/rdsk/c1t0d0s0
Total disk size is 3263 cylinders
Cylinder size is 16065 (512 byte) blocks
Cylinders
Partition Status Type Start End Length %
========= ====== ============ ===== === ====== ===
1 Active Solaris2 1 2609 2609 80
This shows the expanded number of cylinders. but a format command does not.
bash-3.00# format
Searching for disks...done
AVAILABLE DISK SELECTIONS:
0. c1t0d0 <DEFAULT cyl 2607 alt 2 hd 255 sec 63>
/pci@0,0/pci1000,30@10/sd@0,0
Specify disk (enter its number):
Any ideas?
Thanks.

Answer 1

That's the MBR label on the disk. That's easy to modify with fdisk.
Inside the Solaris partition is another (VTOC) label. That one is harder to modify. It's what you see when you run 'format' -> 'print' -> 'partition' or 'prtvtoc'.
To resize it, the only method I'm aware of is to record the slices somewhere, then destroy the label or run 'format -e' and create a new label for the autodetect device. Once you have the new label in place, you can recreate the old slices. All the data on the disk should be stable.
Then you can make use of the space on the disk for new slices, for enlarging the last slice, or if you have a VM of some sort managing the disk.
Darren