[OpenAFS] AFS Speed
10 Jan 2003 11:22:16 +0100
Nathan Ward <firstname.lastname@example.org> writes:
> I have an AFS cell, which has a single fileserver and a bunch of
> The fileserver has ~180Gb of storage, which achieves ~60Mb/sec when
> writing directly to an ext2 partition.
> From all my client machines, the access speeds to the AFS server are
> shocking. Deleting a tree that is ~25Mb of source files (ie smallish
> files) takes upward of 30 minutes, and there appears to be very little
> CPU load on the server and client machines during this time...
> Reading that tree takes a long time (I dont have any figures right
> now), but not as long as writing or deleting.
> It seems that all the fileserver processes are at about 0.1-0.9% CPU,
> and are almost always sleeping.
> Network speed is not an issue, as there is full gigE between the 2 machines.
> I originally attributed this to the fact that AFS has its own
> databases etc and manipulating them could be slowing it down, but if
> that were the case, you'd think that the CPU load on the server would
> be much higher.
> There is around about 2500-4000 contexts switches per second, im not
> sure if thats a high value or not.
run afsfsperf from the arla-0.36-branch and compare it with my numbers.