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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