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

["Shankar, Murali" <mshankar@slac.stanford.edu>]

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