Re: EPICS Archiver Appliance BPL- Changing storage intervals for PVs on an individual basis

["Shankar, Murali via Tech-talk" <tech-talk at aps.anl.gov>]

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