Resolution:
The EMS server will resume the normal operation when pending message count goes below 10% of the total peak message count it had.
Till then, it will continue to operate in the reserve mode. Once the pending messages are consumed below 10% of the total peak message count, EMS will resume its normal operations. This 10% limit is not configurable. Reserve memory should be something that is used as a protection device and should not be entered and exited.  The design of reserve memory is to be a worst case scenario buffer, because of this when EMS enters reserved memory it treats this as a recovery scenario and hence the reason we set wait until pending message count drops below 10% of the peak back log message.

Here the peak backlog message is the message count in the first “SEVERE ERROR” message.

E.g.:
2007-07-06 02:00:39 SEVERE ERROR: Running on reserve memory, no more send requests accepted. Pending msg count = 181409

Here it printed the pending message count = 181409

EMS server will be off the reserve memory mode only when the current pending message count falls below 18140 (i.e. 10% of 181409). By then, EMS server will accept new incoming messages and normal messaging resumes.