Seagate ST3450657SS, ST3300457SS, ST3600857SS manual Dual port support, SCSI commands supported

12.2Dual 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.

12.3SCSI 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

46 Cheetah 15K.7 SAS Product Manual, Rev. D