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<== Date ==> <== Thread ==>

Subject: Re: How to use Archiver Appliance to archive PVs of only the latest period of time
From: "Shankar, Murali" <mshankar@slac.stanford.edu>
To: "tech-talk@aps.anl.gov" <tech-talk@aps.anl.gov>, "wanglin@ihep.ac.cn" <wanglin@ihep.ac.cn>
Date: Thu, 14 Sep 2017 04:04:32 +0000

Hi Lin,


>> In order to save storage space, we just want to archive PVs of the latest one month.


You should be able to create a policy for these 5000 PV's with a partition granularity of a month. That is, in your policies.py file, your LTS (or MTS) can be something like

pb://localhost?name=LTS&rootFolder=${ARCHAPPL_LONG_TERM_FOLDER}&partitionGranularity=PARTITION_MONTH.


If you add PV's to the archiver using this policy, you should be able to store data in chunks of one month each. 



>> the requirement may be adjusted to three or six months in future)

You could then delete the older data using a Python script. Or, if you decided to keep, let's say four months you could add a blackhole plugin after this plugin. For example, 

LTS -> partitionGranularity=PARTITION_MONTH​&hold=5&gather=1 followed by a 

Final -> 'blackhole://localhost'

would keep at least (5-1)=4 months data in your LTS.


For more details, please see http://slacmshankar.github.io/epicsarchiver_docs/api/edu/stanford/slac/archiverappliance/PlainPB/PlainPBStoragePlugin.html


Hope that helps.


Regards,

Murali





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Re: How to use Archiver Appliance to archive PVs of only the latest period of time Wang, Lin

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