Vinum performance

Per olof Ljungmark peo at
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.

Many thanks,
Per olof

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