[GE users] problem with migrating to shadow master

rumpelkeks tina.friedrich at diamond.ac.uk
Mon Nov 22 14:12:41 GMT 2010

Hello list,

I have just discovered that I can't seem to migrate my qmaster service 
any more (it definitely used to work).

I get the "old qmaster did not write lock file. Cannot migrate qmaster." 
error. If I manually touch a file called 'lock' in the spool directory, 
all works fine. Oh plus it successfully shuts down the qmaster (just 
never starts one). So I've probably traced it down to 'no lock file'.

Have found nothing in the logs to explain it either.

Now. Need some pointers for further debugging.

I don't quite understand this 'locking' mechanism - when and where (and 
where to) is the 'lock' written? (I can't really find anything in the 
startup script that writes the file, only things that check for it). Is 
this something that the old qmaster writes when it's shutting down and 
the new one only starts once it appears? (There certainly is no 'lock' 
file in the spool directory when the qmaster is running.)


PS the sgeadmin user that the qmaster runs as can most certainly write 
into the spool directory

Tina Friedrich, Computer Systems Administrator, Diamond Light Source Ltd
Diamond House, Harwell Science and Innovation Campus - 01235 77 8442

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