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)
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