You can create a RAID 0, 1, 5 and 1+0 in Solaris by using SVM. You may also want to create a RAID-Z with ZFS which is highly recommended, it surprised me this advanced filesystem with its simplicity and power.

Read policies on Mirrors:

Round Robin : This is the default policy, reads are distributed across all submirrors.
Geometric : The disk from which it is read is selected depending on the position of the hard disk header in relation to the address where the data is stores, gaining performance.
First : Suppose your first hard disk in the mirror is faster than the others, so you can setup to make all reads from here.

Write policies on Mirrors:

Parallel : This is the default policy, the write operation is done on all submirrors simultaneously, this improves write performance mostly if the mirrors are duplexed.

Serial : This policy says that the write to one submirror has to be completed first before doing it on the next submirror.