Hello, this is my first e-mail to you guys and I was wondering if anybody
can help.
I've just set up an Alpha 8400 with 4 HSZ70's connecting through 4
Ultra-Wide differential SCSI controllers (KZPBA-CB) under Digital Unix 4.0D.
To test the performance of these super fast disks I set up a three disk
stripeset (using UltraWide disks) mirrored with another three disk stripeset
using LSM over 2 different controllers. The writeback cache and the transfer
size has been set.
When doing some benchmarks it appears they are not performing as they
should!
Using dd for writes they are reaching about 14MB per second which seems
okay. However, when using cat for reads (pre cache) I'm only getting about
8MB per volume which works out to be about 1.3MB per physical disk. This
seems extremely slow. Has anybody ever come across this before. Am I missing
something?
Thanks
Elaine Andrews
Received on Tue May 11 1999 - 07:10:32 NZST