The size of an outbound queue is calculated by the formula:
OutboundQueueSize = OutboundQueueVolume * (FailureDuration + SaveInterval)
where:
OutboundQueueVolume is the amount of data in bytes entering the queue per time period.
FailureDuration is the maximum time the queue is expected to buffer data for an unavailable site. For the purpose of these example calculations, assume that failure duration is set at 4 hours (14,400 seconds).
SaveInterval is the time configured for that particular queue. For the purpose of these calculations, assume that the save interval is 2 hours (7200 seconds).
FailureDuration + SaveInterval is 21,600 seconds.
The OutboundQueueSizes for the three sites are:
Site1 = 7K/sec * 21,600sec = 151MB
Site2 = 15K/sec * 21,600sec = 324MB
Site3 = 9K/sec * 21,600sec = 194MB
