We have several logstreams using a virtual coupling facility structure.  Is there a command to issue, or a utility to run, which will cause the data in the structure to be flushed to the offload datasets?  We have a requirement to issue awsstop prion to a Linux backup of our volumes.  This causes data contained in the structure to be lost since the virtual coupling facility and VM are both taken down.

I know that CICS does this for its RRS logstreams during a normal CICS shutdown, but we have other logstreams that don't get flushed.

The answer for your first question is no. CF structures are managed by the subsystem that owns it. Follow the shutdown process correctly and bring down all the subsystems and tasks normally. Doing that, there is no need to be worried about those sturctures.

Specifically RRS, when a subsystem is started it connects to RRS and start sending data to its structure. If the subsystem is normally finished, all those data is not useful anymore. It will be only in case of subsystem abnormal end when an automated restart process is configured.