Per olof Ljungmark
peo at intersonic.se
Fri May 30 05:35:05 PDT 2003
Greg 'groggy' Lehey wrote:
> On Friday, 30 May 2003 at 11:16:06 +0200, Per olof Ljungmark wrote:
>>Using Vinum on 4.7-RELEASE-p10, I wonder what can be done to optimize
>>performance. So far I am not impressed but perhaps I did not configure
>>Vinum optimal, grateful for any hints thanks.
> You haven't said what your problem is. It definitely depends on your
> application (which may simply be the way you measure it).
> FWIW, the stripe size should be a multiple of the file system block
> size. Yes, the man pages don't necessarily say that, but it's also
> not so important.
Sorry for the minimal info given in initial post -
The bottleneck is write performance, reading from the documentation this
is normally a weak point in Vinum/raid5 setups.
The volume will be used for storing temporary files with sizes in the
1-4MB range, a few hundreds at a time. Reads are fine but writes a bit slow.
Copying 170 files total 319MB TO the Vinum volume takes about 2m45s.
Copying same files FROM the Vinum volume to another volume on a hardware
raid5 controller takes 43s.
This machine is not in production yet so I can still make changes to the
configuration. The current block size is 16384 and the stripe size 419k.
I assume it would be a good idea to change that to for example 491,520?
If you could please confirm if I could look for further improvements or
if the performance is about what one should expect.
More information about the freebsd-questions