We are not interested in all out performance of the RAID, as the network is likely to be the bottleneck. However, we are keen to keep an eye to the future, and ensure that what we get will be usable for a while yet. We currently have one backplane per SCSI bus, one or two SCSI buses per server, giving a 3 or 6 disks, using RAID levels 1 in nearly all cases.
Most suppliers offer a range which covers all three.
The definitive document has info on SW, HW, SCSI, Booting, etc. Mylex Mylex was one of the recommended options. The Linux HACKers side is done by dandelion but they provide a Linux CD which has an FAQ . The interesting feature of the PM1554U2 is that it can have extra LVD bus modules added. They have announced Linux support .