[OpenAFS] Are there any known performance issues with large numbers of volumes per partition?

Steve Simmons scs@umich.edu
Thu, 10 Aug 2006 22:10:21 -0400

On Thu, Aug 10, 2006 at 04:05:43PM -0700, Renata Maria Dart wrote:
> Hi, we are changing the configuration of the vice partitions on each
> of our AFS fileservers from 8 60gb partitions to 2 240gb partitions
> (as part of our transition to 1.4.1).  Do I need to be concerned about
> any performance impact from increasing the number of volumes per
> partition?  Certainly listvol takes longer the more volumes you have,
> but are there any other issues to worry about because of this
> increase?  Most of our 60gb partitions have 100-200 volumes and
> OpenAFS seems to have handled the switch to 400-800 volumes per 240gb
> partition with no problems.  But we have a few 60gb partitions that
> contain ~4000 small "morgued" volumes which get very little use.
> These morgued volumes will now be mixed with production volumes on a
> 240gb partition.  Or should I make an effort to continue to keep them
> separate?

We're using 1.3TB partitions with upwards of 20,000 volume per partition.
Yes, vos listvol is slow. :-) But everything else is pretty snappy.