I am running OpenAFS on linux machines. Take a look at the context switches on the client and the server....
(vmstat 1, look at the "cs" column)
NFS solves this problem by having a fully kernel server and client.
What causes these context switches? I'm not too sure. Is it possible to find out? Again, I don't know. IIRC context switches occur when switching from kernel to userland and vice versa. Perhaps with all the reading and writing disks (client cache and server datastore), and sending packets over the network there are this many context switches..?
People claim that "OpenAFS scales better", sure it definately does, but should this mean that it's maximum speed is degraded? I don't see how this can be..?
Nathan Ward
On Tue, 24 Jun 2003 16:52:45 +0200 (CEST), Lukas Kubin <[EMAIL PROTECTED]> wrote:
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I'm running OpenAFS version 1.2.9-2 (Debian package) on a 2-processor
machine, where "vicepa" is on RAID5 (Adaptec) container installed. The
filesystem used is ext3.
When I try to write one 700 MB large file to AFS, it takes more than 3
minutes to complete. I tried this both locally (by generating the file
with "dd" from /dev/zero) and through 100 Mbps network. The result was the
same.
Is this normal feature of AFS or do I have to do some tuning?
Thank you.
lukas
- -- Lukas Kubin
phone: +420596398285 email: [EMAIL PROTECTED]
Information centre The School of Business Administration in Karvina Silesian University in Opava Czech Republic http://www.opf.slu.cz -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.1 (GNU/Linux) Comment: Made with pgp4pine 1.75-6
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