opendev/system-config
Code Issues Proposed changes

Raise callbacks for AFS server

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As documented in [1]

 If the number next to "GotSomeSpaces" or any of the "GSS*" fields is
 greater than 0, then the fileserver ran out of callback space and had
 to prematurely revoke callback promises from clients in order to free
 up space.

Here's our stats on afs01:

  $ xstat_fs_test localhost -collID 3 -onceonly

  Starting up the xstat_fs service, no debugging, one-shot operation

  ------------------------------------------------------------
            13547865 DeleteFiles
          1849223729 DeleteCallBacks
            45049055 BreakCallBacks
          2098382037 AddCallBack
                 174 GotSomeSpaces
                7800 DeleteAllCallBacks
               20778 nFEs
               21184 nCBs
             1500000 nblks
            43425561 CBsTimedOut
                   0 nbreakers
                   8 GSS1
                   4 GSS2
                   5 GSS3
                 169 GSS4
                   4 GSS5

So as noted, the server ran out of callback spaces a few times.
Raising it takes only a little memory, but will help performance.

Thanks to Jeffrey Altman (auristor) for pointing this out.

[1] https://www.openafs.org/pages/newsletter/newsletter-2013-03-volume004-issue05.html

Change-Id: I2ad33dd8918cb559634d2c5b8c4e4e7f2d6d4051
This commit is contained in:
Ian Wienand 2019-06-28 12:03:23 +10:00
parent 4aac4b990a
commit abf11982ce
1 changed files with 1 additions and 1 deletions
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2
doc/source/afs.rst
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@ -259,7 +259,7 @@ Finally, create the fileserver with::
bos create -server NEWSERVER -instance dafs -type dafs \
-cmd "/usr/lib/openafs/dafileserver -L -p 242 -busyat 600 -rxpck 700 \
-s 1200 -l 1200 -cb 1500000 -b 240 -vc 1200 \
-s 1200 -l 1200 -cb 2000000 -b 240 -vc 1200 \
-udpsize 131071 -sendsize 131071" \
-cmd /usr/lib/openafs/davolserver \
-cmd /usr/lib/openafs/salvageserver \