10.2Dual 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.

10.3SCSI commands supported

Table 19 lists the SCSI commands supported by Cheetah 15K.7 drives.

Table 19: 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

 

 

 

44

Cheetah 15K.7 SAS Product Manual, Rev. A

Page 50
Image 50
Seagate ST3450857SS Dual port support, Scsi commands supported, Commands supported by Cheetah 15K.6 SAS family drives