Had to read and reread the humongous IDE vs SCSI RAID thread 3-4 times over to fully appreciate the issues...
"[UDMA 133] is a mirage and an irrelevancy. That's the theoretical maximum transfer rate of the bus, which can never be approached even in ideal cases, because data flow is limited to the physical read speed of hard drives," ...is probably untrue because the presence of large caches on today's IDE hard drives (I believe they're up to 4 to 8MB on high end drives nowadays) does make a practical difference in the throughput of hard disks. As to whether Linux's 'efficient cache buffer management' will necessarily 'mask the effect' of onboard hard disk caches, I think that's an open question. The best way to settle this would be to disable the onboard hard disk caches and do a benchmark. Now taking bets... :-) 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. _ 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]
