User Manual

Constellation.2 SAS Product Manual, Rev. K 58
11.2 Dual port support
Constellation.2 SAS drives have two independent ports. These ports may be connected in the same or different SCSI
domains. Each drive port has a unique SAS address.
The two ports have the capability of independent port clocking (e.g. both ports can run at 6Gb/s or the first port can
run at 6Gb/s while the second port runs at 3Gb/s. The supported link rates are 1.5, 3.0, or 6.0Gb/s.
Subject to buffer availability, the Constellation®.2 drives support:
• Concurrent port transfers—The drive supports receiving COMMAND, TASK management transfers on both ports at
the same time.
• Full duplex—The drive supports sending XFER_RDY, DATA and RESPONSE transfers while receiving frames on both
ports.