Seagate ST3450757SS, 100516226 Interface Requirements, Sas Features, task management functions

11.0INTERFACE REQUIREMENTS

This section partially describes the interface requirements as implemented on Cheetah 15K.7 drives. Additional information is provided in the SAS Interface Manual (part number 100293071).

11.1SAS FEATURES

This section lists the SAS-specific features supported by Cheetah 15K.7 drives.

11.1.1task management functions

Table 7 lists the SAS task management functions supported.

Table 7 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

11.1.2task management responses

Table 8 lists the SAS response codes returned for task management functions supported.

Table 8 Task management response codes

FUNCTION NAME	RESPONSE CODE
Function complete	00
Invalid frame	02
Function not supported	04
Function failed	05
Function succeeded	08
Invalid logical unit	09

11.2DUAL PORT SUPPORT

Cheetah 15K.7 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 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.

CHEETAH 15K.7 SAS PRODUCT MANUAL, REV. F 38