Configuring a Simple PI System (PI Admins I) Online Course - Enable Auto Archive Creation on the PI Data Archive
Is it necessary to first restart the PI Archive subsystem before forcing a shift, to make sure the tuning paramter settings are picked up?
Hi Max,Great question!!! Tuning parameters have different requirements for when they take effect. For instance, AutoArchiveFileRoot takes effect before every archive shift, since that is when the setting is required. Thus, you do not need to restart the PI Archive subsystem for it to pull in the new value.
However this is different from a parameter like the Snapshot_EventQueuePath which does require you to restart the PI Snapshot subsystem for it to take effect
If you look at a tuning parameter in PI System Management Tools > Operation > Tuning Parameters, it should mention if the particular tuning parameter takes effect at startup (of the associated subsystem) or after other criteria.
After performing an archive shift away from a primary archive, is it possible to return to that archive and re-designate it as primary, or is it permanently closed?
Good question! The most straightforward answer is yes, once you close a primary archive, it will permanently remain a historical archive.
There are ways to work around this. If, for example, you shifted a primary archive by accident, and absolutely need to revert it and have an active primary archive that covers the same time range, you can create a new archive with the same start time, and no end time. After reprocessing the data from your old archive into this newly created one, you can register the newly created archive as your active primary.
As you can see, it is possible to create a copy of the old archive with no end time, making it a primary. However, there is not usually a benefit to doing so, since the PI Data Archive is optimized to handle many sequential archive files.
Thank you for your response. Wouldn’t it be optimal for disk space usage to have one archive file that is 100% full, rather than say, four archive files that are each 25% full?
Retrieving data ...