[OpenAFS-devel] fileserver parameters

[Niklas.Edmundsson@hpc2n.umu.se]

On Sat, 18 Jun 2005, Tom Keiser wrote:

>> So, can anybody comment on these numbers? Those are dual Opteron
>> boxes with enough RAM, so please make some suggestions what options I
>> should try to get more like the real performance of a fileserver...

What kernel? What underlying filesystem?

The performance figures you mentioned when talking directly to the 
raid, are they when doing IO on a filesystem that are similar to the 
AFS IO pattern (ie accessing a large number of small files)? Streaming 
IO figures are more or less uninteresting when doing AFS in our 
experience.

If using ext*, go for ext2 and boot the machine with SMP disabled and 
se what happens. This improved the situation somewhat for us, but this 
was on a 2.4 kernel tho (albeit 2.6 is said to still have issues wrt 
ext3 and SMP).

Filesystem-wise, xfs seems to be the best performing (and most robust) 
filesystem on Linux nowadays, but I don't know whether it's supported 
to have your /vice* on Linux-XFS...

/Nikke
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