Reason for change

This is a request to change the xrootd server version and have a minor update of the client tools.

Server version update

We would like to upgrade the xrootd server version for the Fermi xrootd cluster from version
20080828-1632 to 20090202-1402. The main changes change between these two versions are:

1. Improved and fixed handling of checksum request requests by the server. This fixes issues that could cause checksum request to hang and large cpu usage of the xrootd server.

Because of Due to this currently issue the crawler is currently not using the production xrootd version but the test xrootd that runs the new version.

Client version update

A The first time a xrootd client the first time it connects to a cluster it tries FirstConnectMaxCnt times to connect before it will fail. The default for this number is 150 but for xrd.pl the it is overwritten and set to 10. Therefore a client will fail after about 3.3 min (the wait between connection attempts is 20s20sec) where as whereas with the default setting the client will fail only after 50 min. This is import as for an outage which typically last from 5-30min 30 min we stop the redirector to avoid clients from being redirected and with the short wait time xrd.pl might fail.

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The new version has been installed as a test version on the Fermi xrootd cluster which allows access to the glast data. The production crawler is using this version for more then than a month.
Also skimmer jobs were run successfully run against this version.

The fix to the timeout for xrd.pl has been tested and . It has been verified that it will wait the expected time if a xrootd server is not available.

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The client version is rolled back by recreating the link to the old version.

CCB Request

https://jira.slac.stanford.edu/browse/SSC-185

Details

Server version upgrade

cmsd logfile name change

At the same time of the restart I would like to change the logfile name for the cmsd from olbdlog to cmsdlog this

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requires to change the name in StartXrd.cf.glast the name to:

1. CMSLOGFN=cmsdlog

Restart of xrootd

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The restart should take less then five minutes. Stopping the redirectors first prevents clients being redirected and the chance that a file is not found because a data server is being restarted. The clients will wait during while the restart xrootds are down and reconnect to once the data servers and redirectors are up.

Update the client

1. Change the link /afs/slac.stanford.edu/g/glast/applications/xrootd/PROD from
   @sys/20080728-0933/ to dist/20080728-0933v1/@sys The layout

This update will not change the xrootd client binaries it will only change the xrd.pl
perl script.

The directory structure of the xrootd application

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changed. Instead of keeping releases in afs-sysname/release-name they are now in dist/release-name/afs-sysname (e.g.: i386_rhel30/20080728-0933v1 to dist/20080728-0933v1/i386_rhel30).