aiStall = Enabled

What does it mean? What do I do about it?

Suspends updates if all after-image logs are full or locked and rfutil "new" fails.

If the database stalls, end users and part-time administrators may become confused and often will not know how to recover.

Aistall is enabled automatically when using the AI Management Daemon (AI Archiver).

If you run out of AI for whatever reason and the running database is stalled (-aistall is enabled),  you'll need to add more AI extents.  When they become available, the database will continue processing. If you are running OE Replication, you will need to restart the replication agent(s) and replication server.