[SunHELP] [Q] relate to 3310 SCSI array?

[L]

We plan to buy a SUN 3310 SCSI array to work with our E280R server.  Due
to we don't have much budget now.  we plan to buy 3310 Array with 5 X73 Gb
disk only.  My questions are:

1. in the future can I put RAID controller card into it?

2. what difference between one RAID controller and two RAID controller on
3310?

2. in the future can I put 512 MB cache into it?

3. Is it easy to add those parts?

4. 3310 document say it can connect to two nodes, how it work?

Thanks.