On Thu, 18 Jul 2002, Andy Sy wrote: .. > Now about SCSI disconnect... how does that work and how does it > allow "bandwidth aggregation" among multiple SCSI devices on the > same chain when at any given time, on a shared bus model, only one > device can be transmitting data at a time? At best, it sounds like > just a finer grained relinquishing of the bus. Thus, with a 2 > drive setup (the maximum under ATA), it might not make a big > difference in performance, certainly not enough to justify the > huge price difference of a SCSI drive.
Exactly! you are right. SCSI packets allow a finer level of granularity on the bus. You are ALSO correct, for a two-drive setup, SCSI will not give you much of a performance advantage over IDE. But very few people use SCSI in two-drive configurations. Another thing. Even on a single-drive machine, under heavy disk I/O and VM load, a SCSI-based workstation simply "feels faster" than an equivalent IDE one, even with UDMA turned on via hdparm. I can't explain it, since it's just one drive. But I've felt that psychological difference in responsiveness. --- Orlando Andico <[EMAIL PROTECTED]> Mosaic Communications, Inc. _ Philippine Linux Users Group. Web site and archives at http://plug.linux.org.ph To leave: send "unsubscribe" in the body to [EMAIL PROTECTED] To subscribe to the Linux Newbies' List: send "subscribe" in the body to [EMAIL PROTECTED]
