> -----Original Message-----
> From: Corin Hartland-Swann [mailto:[EMAIL PROTECTED]]
> Sent: Thursday, July 27, 2000 7:53 AM
> To: Gregory Leblanc
> Cc: Holger Kiehl; [EMAIL PROTECTED]
> Subject: RE: Question on disk benchmark and fragmentation
>
[snip]
> When I was comparing performance of RAID0+1 to RAID5 there was a big
> difference in how quickly (as per number of threads) they ground to a
> halt. Here's an example:
>
> ./tiobench.pl --size 256 --dir /mnt/md3/ --block 4096 --threads 1
> --threads 2 --threads 4 --threads 16 --threads 32 --threads 64
> --threads 128 --threads 256
I'd recomend that you add a --numruns 4 (or more, if you like) to these
options. This will help to get more consistent numbers, which you are NOT
getting judging from the first WRITE performance number in the first two
tests. I believe that I found 4 was a good numruns for me, YMMV.
Grego
