How increase external disk size used for an existing file system, Solaris10

Configuration:
Server: Sun T5220
S/O: Solaris 10 5/08 s10s_u5wos_10 SPARC
Storage: EMC AX4-5
EMC PowerPath: PowerPath Version 5.2
I have the following scenario:
In AX4-5 storage array, I created two LUNs into RAID Group 10, with Raid Type1/0:
LUN 101: 20Gb
LUN 102: 10Gb
Both LUNs were added to Storage Group (SG1) that includes two Servers (Server1 and Server2); both servers have Operating System Solaris 10 5/8 and Power Path.
The servers detect both LUNs across two paths. With Power Path were created a virtual path (emcpower0a, emcpower1a) to access to each LUNs respectively.
We have mounted two file system /home/tes1 over emcpower0a -> LUN101 and /home/tes2 over emcpower1a -> LUN102.
Filesystem size used avail capacity Mounted on
/dev/dsk/emcpower0a 20G 919M 19G 5% /home/test1
/dev/dsk/emcpower1a 10G 9G 1G 90% /home/test2
I want to increase the space in file system /home/test2, without lost the information that I have stored and using the same LUN, LUN 102. To do this I start with the following steps:
1- Create new LUN, LUN 103 with 15Gb into RAID Group 10. Result: OK, I have available space in RAID Group 10.
2- Add LUN 103 to LUN 102, using concatenation option. Result: OK. This action creates a new metaLUN with the same characteristics of LUN 102, but with new space of 25Gb.
After to do these actions, I want to know how Solaris recognize this new space. What I need to do, to increase the size of file system /home/test2 to 25 Gb. Is that possible?
I reviewed the description of each disk using format command, and the disks not have any change.
Could anyone help me? If you need more detail, please do not hesitate to contact me.
Thanks in advance.

Robert, thank a lot for your know how. You helped me to clarify some doubts. To complete your answer, I will add two more details, based on my experience.
After to execute, type -> auto configure and label, the disk was created with different partitions like root, swap, usr, like this:
Volume name = < >
ascii name = <DGC-RAID10-0223 cyl 49150 alt 2 hd 32 sec 12>
pcyl = 49152
ncyl = 49150
acyl = 2
nhead = 32
nsect = 12
Part Tag Flag Cylinders Size Blocks
0 root wm 0 - 682 128.06MB (683/0/0) 262272
1 swap wu 683 - 1365 128.06MB (683/0/0) 262272
2 backup wu 0 - 49149 9.00GB (49150/0/0) 18873600
3 unassigned wm 0 0 (0/0/0) 0
4 unassigned wm 0 0 (0/0/0) 0
5 unassigned wm 0 0 (0/0/0) 0
6 usr wm 1366 - 49149 8.75GB (47784/0/0) 18349056
7 unassigned wm 0 0 (0/0/0) 0
This was not convenient because all information stored appear in the first slice and growfs not work if appear root or swap slice into the disk, for that reason was necesary to recreate manually every slice with partition command. The final result was this:
Part Tag Flag Cylinders Size Blocks
0 unassigned wm 0 - 49149 9.00GB (49150/0/0) 18873600
1 unassigned wu 0 0 (0/0/0) 0
2 backup wu 0 - 49149 9.00GB (49150/0/0) 18873600
3 unassigned wm 0 0 (0/0/0) 0
4 unassigned wm 0 0 (0/0/0) 0
5 unassigned wm 0 0 (0/0/0) 0
6 unassigned wm 0 0 (0/0/0) 0
7 unassigned wm 0 0 (0/0/0) 0
Now, execute again the label command to save the new information.
Mount file system and execute:
growfs M file_system mount_point to expand the file system to 9Gb.

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