scsi raid confusion!
I have come across a stumbling block however.
I am checking out several SCSI raid cards, I have determined that (for good performance) I am interested in:
64-bit
expandable on-board memory module
U160
With that in mind, I found a few that fit the bill, by LSI Logic, Adaptec, Mylex, and ATTO.
What I dont understand:
1) What is the difference between 1 channel and 2 channel? For a 2-disk RAID 1 array does it matter? At least with IDE, you would get max performance by using 2 different channels as opposed to master+slave combo, but of course SCSI works differently. Help!
If my hypothesis is correct.. how much loss of performance are we talking about with just 1 channel RAID-1?
2) These memory modules on the adaptors.. are they just standard PC133 ECC registered ram? I cant tell from the photos. They look shorter to me, like the old EDO ram
3) Adaptec makes a raid add-on card for motherboards with built in U160 SCSI. They call it 0-channel RAID. What do you do with that? I do not currently own such a board so I have no idea where it might plug in / how it works. I did understand that it turns your U160 onboard SCSI into RAID somehow...
Thanks for helping a newbie out!
