Experimental Physics and
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It seems that you want to achieve a reliable service which will not be shut down just because the X-Terminal wend down on which you are running your alh which collects all the alarms - true? So the first step was to add the Master/Slave mode to alh. Now you can run several instances of the alarm handler (with the same configuration file). This is good - so you can allow that one of the alh's will shut down. Another one will take over and write the data to disk. But - if all your systems reboot - or at least those running your alh's? Ideally you would want to run alh from the command line during system reboot. Well we've actually created an alh version from which we stripped all the X-Windows stuff. But - in this case it's really a completely new program! alh IS X-Window and highly dependent from lot's of X-Window features (like the main execution loop). This version never seriously went into production. So here's your solution: Create one or more vnc sessions on your server machines and start your main alh instances in Master/Slave mode on these machines during startup. We are starting the main alh instances at least on two machines each in an individual vnc session. For the future we want to change the alh message stream from opt-in (as it is now) to opt-out - any alarm will be sent from the IOC to an alarm queue. This way you will run a system process in the background which makes sure that any alarm from an IOC (independent of any configuration file) will be written to e.g. Oracle or a file. See attached drawing ... -Matthias Ernest L. Williams Jr. wrote: Hi everyone, -- ------------------------------------------------------------------------ Matthias Clausen Cryogenic Controls Group(MKS-2) phone: +49-40-8998-3256 Deutsches Elektronen Synchrotron fax: +49-40-8994-3256 Notkestr. 85 e-mail: [email protected] 22607 Hamburg WWW-MKS2.desy.de Germany ------------------------------------------------------------------------
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ANJ, 02 Sep 2010 |
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