Sun’s T3 documentation is available online:

The Sun StorEdge T3 and T3+ Array Configuration Guide explains physical configuration.
The Sun StorEdge T3 and T3+ Array Administrator’s Guide explains the software side.

The short course:

Creating volume ‘v0’ using half the disks:

vol add v0 data u1d1-4 raid 5 standby u1d9
vol init v0 data
vol mount v0

Creating volume ‘v1’ using the other half of the disks:

vol add v1 data u1d5-8 raid 5 standby u1d9
vol init v1 data
vol mount v1

Listing volumes:

vol list
volume        capacity   raid   data     standby
v0            108.6 GB    5     u1d1-4    u1d9
v1            108.6 GB    5     u1d5-8    u1d9