Planned CLASDB Upgrade -- COMPLETE

03/21/2012 8:00 am
03/21/2012 12:00 pm

As of noon on Wednesday, March 21, 2012, the upgrade of the CLASDB server is complete. The version of the database has been migrated from 4.0 to 5.5, and farm jobs that had been waiting for reservations should now begin to run.  If you have any trouble connecting to or using the database, please contact one of the following:

Kari Heffner (, Maurizio Ungaro (, or Dennis Weygand (


We are planning an upgrade of the CLASDB server for this week, which will be scheduled to coincide with an expected ~12-hour beam downtime on Wednesday, March 21, 2012, day shift (8:00AM) for beam studies.

The upgrade will migrate the version of the MySQL database from 4.0 to 5.5.  During the upgrade, all connections to CLASDB will be disconnected, which may impact running farm jobs.  To avoid this, prior to the upgrade, we will limit job submission reservation times such that all CLAS jobs should be completed by the time the upgrade begins.

As a reminder, CLASDB is used for:

  • CLAS calibration constant, RUN CONTROL.
  • wiki pages
  • logbook

A new version of the server already exists, with a copy of all the CLASDB tables. The name of the new server is CLASDB-1.  We invite CLAS users directly involved to test CLASDB-1 so the transition will be transparent, and to report any problems.  a1c, gemc, the logbook and the wikis are successfully tested.

At the time of the transition, the old CLASDB will be turned off and CLASDB-1 will be renamed CLASDB.

Contact persons: