eschle@forty2.physik.unizh.ch (Patrik Eschle) (10/29/90)
We are about to upgrade our system from Multibus (MB) to VME and will have more disk then with *less* IP. The current configuration is something like: MB IP -- disk tray (2 disks) - exabyte / magtape - floppy MB IP -- serial IO MB IP -- disk tray (2 disks) - ethernet VME IP -- disk tray (2 disks) - exabyte This means one IP per disk tray. In the new configuration there will 4 disk trays, but only 3 VME IP. Although our local Alliant representative claims, that VME IP are twice as fast as MB IP, a quick test shows that IO-performance is the same for the VME and MB disks (about 350 kB/sec). Question: What is your experience with IO-performance? What's your IO configuration? Thanks, Patrik (PS1: The quick test is : for write: 'time dd if=/dev/full of=bla bs=4k count=2500' for read: 'time dd if=bla of=/dev/null bs=4k count=2500' PS2: Has anybody an MX sendmail running on an Alliant? ) -- Patrik Eschle, Physics Institute University of Zuerich (Switzerland) inet: eschle@physik.unizh.ch (bang: uunet!chx400!forty2!eschle) -> Send CHUUG mail to chuug@chuug.uu.ch <-