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[HTCondor-users] condor_drain & condor_defrag daemon interfering


we do not use the defrag daemon at the moment but it seems as it would be a desirable thing as the pool is very well used and multicore jobs are kind of hard to get through. 

What we do already is using the condor_drain command wrapped inside a custom tool/script in order to drain workernodes that are scheduled for maintenance, reinstallation etc. 

When I tested the defrag daemon it looked to me as if the classadds condor_drain is using to tag the hosts are the same ones the daemon is using which leads to an unwanted behaviour as admin-scheduled tasks interfere with regular draining actions of the defrag daemon. 

Hence I am looking for an elegant solution to use the condor_drain command for administration purpose and at the same time have the defrag daemon do his job in the background (for ex. always drain 5 nodes at a time down to 8 free cores) without noticing the nodes that are currently administrated by hand. 

Maybe I got this all wrong or maybe someone has a nifty solution for it ? 


Christoph Beyer
DESY Hamburg

Notkestr. 85
Building 02b, Room 009
22607 Hamburg

mail: christoph.beyer@xxxxxxx