sp1n continues: "We are currently considering 3 options:
(1) SCSI - EIDE controller with six 9G/7200 ATA drives (hadn't heard of this one until recently). This supposedly accesses the drives directly through DMA and bypasses all IDE, just using them as physical media. All are accessed in parallel. I'm a bit weary about the reliability of IDE drives under constant use.
(2) SCSI - SCSI controller with six 9G/7200 u2w drives. The controller currently at the top of my list is the Mylex DAC960SXi w/ 32MB cache. However, something that fits in a half-height bay, instead of hogging a full-height would be nice.
(3) SCSI - SCSI controller as above, running with 2 disk channels and 2 separate RAID 5 arrays for each mountpoint (spool/mail storage).
I'm looking for any experience with IDE/DMA raid setups (1), as well as the pros/cons of making 2 partitions, both which are very active, on one array of 6 drives (2), as well as 2 separate level 5 arrays of 3 for each mountpoint (3). In addition, any suggestions for external controllers and rackmount enclosures would be greatly appreciated. I would like the controller to have an i960 or better processor.
"The glass is not half full, nor half empty. The glass is just too big."