Dual Port Support - Seagate Constellation ES.2 SAS ST33000650SS Product Manual

12.2

Dual port support

Constellation ES.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 6.0 Gb/s.
Subject to buffer availability, the Constellation ES.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.
Constellation ES.2 SAS Product Manual, Rev. E 47