Difference between revisions of "BXadmin:AFS Notes"
(Created page with '= xstat = xstat_fs_test and xstat_cm_test aren't included in the RPMs by default. Easiest way to get them is pull down the source, ./configure && make, and grab them out of src/x…') |
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The GSS values show you how many times GetSomeSpaces was called; basically the number of times the fileserver had to free up existing callbacks to make room for more. To alleviate this condition (as it can hurt performance if GetSomeSpaces is called a lot), increase '''-cb'''. The default for this is 64,000. The fileserver above is a home directory fileserver running with -cb 100000, which clearly is not enough. | The GSS values show you how many times GetSomeSpaces was called; basically the number of times the fileserver had to free up existing callbacks to make room for more. To alleviate this condition (as it can hurt performance if GetSomeSpaces is called a lot), increase '''-cb'''. The default for this is 64,000. The fileserver above is a home directory fileserver running with -cb 100000, which clearly is not enough. | ||
| − | = | + | = fs/dafs tuning = |
| − | In general, these are the settings we're using | + | In general, these are the settings we're using. The only variable we tweak depending on the underlying hardware is -p. For most machines, -p 128. For smaller machines, -p 64 to take some of the load off the machine (I've seen load avg in the double digits on 4-core 2.8GHz Xeon with -p 128). |
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* fs: | * fs: | ||
<pre>fileserver -nojumbo -p 128 -busyat 600 -rxpck 4096 -s 10000 -l 1200 -cb 1000000 -b 240 -vc 1200 -abortthreshold 0 -syslog -d 1 -udpsize 1048576 | <pre>fileserver -nojumbo -p 128 -busyat 600 -rxpck 4096 -s 10000 -l 1200 -cb 1000000 -b 240 -vc 1200 -abortthreshold 0 -syslog -d 1 -udpsize 1048576 | ||
Revision as of 13:20, 17 December 2010
xstat
xstat_fs_test and xstat_cm_test aren't included in the RPMs by default. Easiest way to get them is pull down the source, ./configure && make, and grab them out of src/xstat/
Run xstat_fs_test on a fileserver:
$ ./xstat_fs_test -fsname fs4 -collID 3 -onceonly
Starting up the xstat_fs service, no debugging, one-shot operation
------------------------------------------------------------
1143193 DeleteFiles
34118245 DeleteCallBacks
6000838 BreakCallBacks
101283213 AddCallBack
746 GotSomeSpaces
1462 DeleteAllCallBacks
3164 nFEs
3290 nCBs
100000 nblks
261656 CBsTimedOut
0 nbreakers
1122 GSS1
561 GSS2
185 GSS3
0 GSS4
561 GSS5
The GSS values show you how many times GetSomeSpaces was called; basically the number of times the fileserver had to free up existing callbacks to make room for more. To alleviate this condition (as it can hurt performance if GetSomeSpaces is called a lot), increase -cb. The default for this is 64,000. The fileserver above is a home directory fileserver running with -cb 100000, which clearly is not enough.
fs/dafs tuning
In general, these are the settings we're using. The only variable we tweak depending on the underlying hardware is -p. For most machines, -p 128. For smaller machines, -p 64 to take some of the load off the machine (I've seen load avg in the double digits on 4-core 2.8GHz Xeon with -p 128).
- fs:
fileserver -nojumbo -p 128 -busyat 600 -rxpck 4096 -s 10000 -l 1200 -cb 1000000 -b 240 -vc 1200 -abortthreshold 0 -syslog -d 1 -udpsize 1048576 volserver -nojumbo -udpsize 1048576 -d 1 salvager -parallel all8
- dafs
dafileserver -p 128 -busyat 600 -rxpck 4096 -s 10000 -l 1200 -cb 1000000 -b 240 -vc 1200 -vattachpar 128 -vlruthresh 1440 -vlrumax 8 -abortthreshold 0 -syslog -d 1 -udpsize 1048576 davolserver -p 64 -udpsize 1048576 -d 1 salvageserver dasalvager -parallel -all8
