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

Mathias Feiler feiler@uni-hohenheim.de
Mon, 14 Aug 2006 14:39:25 +0200 (MET DST)

On Thu, 10 Aug 2006, Steve Simmons wrote:

|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.

This is almost true for me too. Beside the "vos listvol" (which slowes down
the fileserver anyway) for me there is a probably soon upcomming performanc
issue with "vos dump" since this is my way to do backup. However, I think a
bigger machine layout can do quit a bit.
Well, of course, this only a point if you hold a large number of very lively
volumes on the partition(s)/server.

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