Description: Customer currently has MaxScale in primary replica configuration. When disk fills to 100% on Primary there can be corruption. Customer already has Critical alerts when disk reaches 95% full. Customer would like to have Primary change to Read-Only when this threshold is reached. Currently, maxscale supports switchover on disk full (and maintenance on disk full for replicas), but Customer would like to leave the cluster in-tact and support Read-only transaction mode on Master node and continue to detect node failures (replicas) while in this state.

Customer admin attempted to put Primary into read_only mode, however maxscale recognizes this and changes it back. Also, locking tables for read only will not work for the customer since it hangs all other connections.

Summary: request for feature enhancement to add a "read_only_on_disk_full" option for Maxscale similar to switchover_on_disk_full?