Dan Hyde of U. Mich. wrote:
parm /usr/libexec/openafs/fileserver -L -p 128 -rxpck 2500 -udpsize 1048576 -l
1000 -s 1000 -vc 1000 -nojumbo -cb 25000000 -pctspare 1
Harald Barth of KTH wrote:
parm /usr/openafs/libexec/openafs/fileserver -nojumbo -p 128 -busyat 1200
-rxpck 800 -s 2400 -l 2400 -cb 200000 -b 480 -vc 2400
It turns out that there is an easy and undocumented way of finding out
whether the "-cb" parameter setting is large enough for your file server.
Issue this command aganst your file server in questions:
xstat_fs_test -fsname afs106 -collID 3 -onceonly | grep GSS
If any of the GSS counters are _not_ "0" then your "-cb" is too small.
This does not tell you what the right size for "-cb" is, though.
To narrow your search space, consider that 64,000 is the default shipping
with the file server and that U. Mich. is using 25,000,000.
Derrick's recommendation was to make this number as large as possible
without causing swapping on the file server.
Here are two examples from our cell at SLAC:
# bos status afs02 -long | grep fileserver
Command 1 is '/usr/afs/bin/fileserver -L -p 128 -cb 128000 -rxpck 2400
-udpsize 10485760 -busyat 500'
# bos status afs03 -long | grep fileserver
Command 1 is '/usr/afs/bin/fileserver -L -p 128 -cb 128000 -rxpck 2400
-udpsize 10485760 -busyat 500'
# xstat_fs_test -fsname afs02 -collID 3 -onceonly | grep GSS
197130 GSS1
98565 GSS2
1308 GSS3
0 GSS4
98565 GSS5
# xstat_fs_test -fsname afs03 -collID 3 -onceonly | grep GSS
0 GSS1
0 GSS2
0 GSS3
0 GSS4
0 GSS5
For "afs02" "-cb 128000" is too small, for "afs03" it is fine.
NB: The collection ID 3 is undocumented. If someone can explain to me
what all these numbers mean, I will submit a documentation patch.
-- Alf.
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Alf Wachsmann | e-mail: [email protected]
SLAC - Scientific Computing | Phone: +1-650-926-4802
2575 Sand Hill Road, M/S 97 | FAX: +1-650-926-3329
Menlo Park, CA 94025, USA | Office: Bldg. 50/323
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http://www.slac.stanford.edu/~alfw (PGP)
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