> dramatically improve system I/O throughput. IBM even warns that using > 3390-9s can degrade performance, think what using a 3390-120Gigabyte would > do! In the PC world, I believe you can see the same sort of effect by using > RAID0 across multiple volumes, versus one large volume.
In the IDE world its one pending I/O per drive pair with overlapping seeks across the master slave. In the SCSI world you can have multiple outstanding commands to the disk and the let the disk figure out how to schedule them. I'm not sure how the performance compares to S390 - a well tuned IDE disk array will touch 100Mbytes/second. A decent SCSI array with something like an aacraid will top out at about 200Mbytes/second. Alan
