Inflow Control

Whether flow of update data to the journal volume is restricted by slowing the response to hosts.

Data Overflow Watch

Number of seconds the system will monitor metadata and journal data to the journal volume when the journal volume is full (100%). The field is blank if Inflow Control is disabled.

When the metadata area or journal data area are full and no more data can be stored, the system regards this as an error and suspends the pairs in the journal.

In a 3DC multi-target configuration in which three UR sites are combined, if the status of the two mirrors in the primary site is Active and the free space in the journal data area or metadata area is less than a certain amount, one of the mirrors in the journal will be suspended by error, regardless of the value in Data Overflow Watch.

Cache Mode

Indicates whether journal data is stored in cache memory on the restore journal.