Alcatel-Lucent 7210 SAS E OS Quality Of Service Manual page 36

QoS Overview
Committed Burst Size
The committed burst size (CBS) parameter specifies the amount of buffers that can be drawn from
the reserved buffer portion of the queue's buffer pool. Once the reserved buffers for a given queue
have been used, the queue contends with other queues for additional buffer resources up to the
maximum burst size.
The CBS for the queues is not configurable entity for the access and access uplink ports. The CBS
value for the queues is set to appropriate default values which takes care of specific FC needs in
terms of maintaining the differential treatment.
Page 36 7210 SAS E OS Quality of Service Guide