View Full Version : Powerbook pismo scsi raid array

07-20-2001, 02:45 PM
I'm wondering which option is more reliable and has most data thoughput! (Option 1) Using Ratoc CB32PB to 2 Cheetah 15k HD in a raid Array utilizing apple's internal scsi controller? or (Option 2) Using Magma's expansion chassis housing 1 ATTO UL2D or UL3D scsi controller? I know I'm attempting something that's probably never been tested before, but any info would greatly be appreciated http://macgurus.com/infopop/emoticons/icon_smile.gif

07-20-2001, 04:33 PM
I think the other question that has to come into play is "which is more expensive".. I would think that that would be option 2...

Option 1 looks pretty nice...


07-20-2001, 06:59 PM
Ratoc CB32PB gives UltraWide SCSI (40MB/s) capability. So the U160 and soon to be available U320 X15s would be operating single ended (SE) and not LVD, neither U2W nor U160 nor U320, but UW.

Looking at the Magma site, it appears here http://www.magma.com/pci/compatibility_main.html (scroll down to PowerBook G3) that UL3D is not compatible, only UL2S, an Ultra2Wide LVD card (80MB/s). Still it would keep those drives operating in LVD mode and give twice the theoretical throughput limit than the Ratoc solution, but at a price. One X15 in my PTP gives about 40MB/s sustained reads/writes on a Miles2 (U2W) card. Your Pismo have a 100MHz bus? If so, that will very much help striping a couple of X15s in RAID and seeing both sustained reads and sustained writes continue upwards.

Reliability, I have no idea about the Ratoc in this area, one way or another. Magma has an excellent reputation as I'm sure you know. k