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Constellation ES.1 SAS Product Manual, Rev. E 55
12.2 Dual port support
Constellation ES.1 SAS drives have two independent ports. These ports may be connected in the same or dif-
ferent 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.1 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.
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