Qsan XS5224D User Manual page 336

iSNS
SAS
Dual Controller Terminology
Item
SBB
6G MUX
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Copyright 2017 QSAN Technology, Inc. All Right Reserved.
mechanism to control access to an iSCSI storage system over the
iSCSI data ports.
Internet Storage Name Service
Serial Attached SCSI
Description
Storage Bridge Bay. The objective of the Storage Bridge Bay Working
Group (SBB) is to create a specification that defines mechanical,
electrical and low-level enclosure management requirements for an
enclosure controller slot that will support a variety of storage
controllers from a variety of independent hardware vendors ("IHVs")
and system vendors.
Bridge board is for SATA II disk to support dual controller mode.