Seagate ST2000NM0054 ユーザーズマニュアル

Seagate Enterprise Capacity 3.5 HDD v4 SAS Product Manual, Rev. C

11.0 Interface requirements

This section partially describes the interface requirements as implemented on Enterprise Capacity 3.5 HDD v4 drives. Additional
information is provided in the SAS Interface Manual (part number 100293071).

11.1

SAS features

This section lists the SAS-specific features supported by Enterprise Capacity 3.5 HDD v4 drives.

11.1.1 task management functions

Table 5 lists the SAS task management functions supported.

11.1.2 task management responses

Table 6 lists the SAS response codes returned for task management functions supported.

11.2

Dual port support

Enterprise Capacity 3.5 HDD v4 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 12Gb/s or the first port can run at 6Gb/s while the
second port runs at 3Gb/s.) The supported link rates are 3.0, 6.0, or 12.0 Gb/s.

Subject to buffer availability, the Enterprise Capacity 3.5 HDD v4 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.

Table 5

SAS task management functions supported

Task name

Supported

Abort Task

Yes

Clear ACA

Yes

Clear task set

Yes

Abort task set

Yes

Logical Unit Reset

Yes

Query Task

Yes

Table 6

Task management response codes

Function name

Response code

Function complete

Invalid frame

Function not supported

Function failed

Function succeeded

Invalid logical unit