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<== Date ==> <== Thread ==>
Subject: Re: EPICS Archiver Appliance BPL- Changing storage intervals for PVs on an individual basis
From: "Shankar, Murali via Tech-talk" <tech-talk at aps.anl.gov>
To: "tech-talk at aps.anl.gov" <tech-talk at aps.anl.gov>
Date: Fri, 26 Jan 2024 02:55:15 +0000
Hi Windsor,
 
Re: I am interested in changing the storage profile (i.e. sts/mts/lts) for a specific single PV
I assume you want to do this after the PV has been added to the archiver. If so, modifyStoreURLForPV is what I would use. Here's some python to do the same

import requests
import json
typeinfo = requests.get("http://localhost:17665/mgmt/bpl/getPVTypeInfo", params={"pv": "mshankar:arch:sine"}).json()
print(json.dumps(typeinfo["dataStores"], indent=4))
requests.get("http://localhost:17665/mgmt/bpl/pauseArchivingPV", params={"pv": "mshankar:arch:sine"})
requests.get("http://localhost:17665/mgmt/bpl/modifyStoreURLForPV", params={"pv": "mshankar:arch:sine", "storage": "MTS", "plugin_url": "pb://localhost?name=MTS&rootFolder=${ARCHAPPL_MEDIUM_TERM_FOLDER}&partitionGranularity=PARTITION_DAY&hold=14&gather=7"})
typeinfo = requests.get("http://localhost:17665/mgmt/bpl/getPVTypeInfo", params={"pv": "mshankar:arch:sine"}).json()
print(json.dumps(typeinfo["dataStores"], indent=4))
requests.get("http://localhost:17665/mgmt/bpl/resumeArchivingPV", params={"pv": "mshankar:arch:sine"})


For more complex changes; there is the jackhammer BPL of /putPVTypeInfo but plz do be careful when using this.

Changing the data store parameters in the typeinfo does not really modify the underlying data for the PV; that is, if you want to change the partition granularity etc, you'll need to use consolidateDataForPV ( immediately after the pauseArchivingPV ) to empty out the STS/MTS etc into the LTS and then make your changes. Hope that makes sense. 

Please do reach out if you have more complex requirements. 

Regards,
Murali



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