On Fri, 20 Jul 2007, Lars Schimmer wrote:
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Hi!
Now we got a GBit switch in our department and I want to test the speed
of our AFS servers.
With scp I gain speeds of 30 MB/Sec between a backup server and my client.
With OpenAFS I gain max speed of 10 MB/sec from AFS fileserver 1 to my
client while fileserver is under heavy load (99% for fileserver process).
Data:
1. Filserver - Dell Pentium Xeon Dualcore 3Ghz System
Software RAID5 out of 4 SATA HDs
Debian Sarge/Etch system,kernel 2.6.17
OpenAFS version 1.4.2-4
2. client
AMD64 Dualcore 6000+
Debian SID system, kernel 2.6.21
OpenAFS version 1.4.4.dfsg1-4
I put a 2 GB file in AFS filespace and cp it onto local HD of my client.
In my client there are two raptor HDs, I could copy data from HD to HD
with an sustained rate of 40-50 MB/sec. Client is roughly at 70% load.
Fileserver is started with options:
parm /usr/lib/openafs/fileserver -nojumbo -L -rxpck 400 -udpsize 1310720
in BosConfig.
I assume the AFS server could be faster because I heard of 20-60 MB/Sec
transfer rate out of OpenAFS.
Any ideas? Is the fileserver really "so slow/so under load" as it could
not pump faster data into the client?
What are your client settings? Messing around with -chunksize can make a
huge difference on speeds for large files. I'd suggest playing around with
that. By default, chunksize is set to 16 (64KB .. 2^16). Something in the
19-20 range (512K-1M) will give you about a 25-30% speedup on large files.
--
Mike Garrison
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