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46 Cheetah 15K.7 SAS Product Manual, Rev. D
12.2 Dual port support
Cheetah 15K.7 SAS drives have two independent ports. These ports may be connected in the same or differ-
ent 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 6Gbit/sec or the first
port can run at 6Gbit/sec while the second port runs at 3Gbit/sec.) The supported link rates are 1.5, 3.0, or 6.0
Gbits/sec.
Subject to buffer availability, the Cheetah 15K.7 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.
12.3 SCSI commands supported
Table 20 lists the SCSI commands supported by Cheetah 15K.7 drives.
Table 20: Commands supported by Cheetah 15K.6 SAS family drives
Command name Command code Supported
Change Definition 40h N
Compare 39h N
Copy 18h N
Copy and Verify 3Ah N
Format Unit [1] 04h Y
DPRY bit supported N
DCRT bit supported Y
STPF bit supported Y
IP bit supported Y
DSP bit supported Y
IMMED bit supported Y
VS (vendor specific) N
Inquiry 12h Y
Date Code page (C1h) Y
Device Behavior page (C3h) Y
Firmware Numbers page (C0h) Y
Implemented Operating Def page (81h) Y
Jumper Settings page (C2h) Y
Supported Vital Product Data page (00h) Y
Unit Serial Number page (80h) Y
Lock-unlock cache 36h N
Log Select 4Ch Y
PCR bit Y
DU bit N
DS bit Y