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Dual port support

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9.2 Dual port support Cheetah 15K.6 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 run at the same link rate. The first port to successfully complete speed negotiation sets the link rate support by both ports. When the second port participates in speed negotiation, it indicates the only supported speed is the speed selected by the first port. If the first port to complete speed negotiation looses sync before the second port completes speed negotiation, both ports revert back to the power on condition of allowing either link rate (1.5 or 3.0 Gbits/sec). Subject to buffer availability, the Cheetah 15K.6 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. 52 Cheetah 15K.6 SAS Product Manual, Rev. B

Section	Page
1.0 Scope	5
2.0 Standards, compliance and reference documents	7
2.1 Standards	7
2.1.1 Electromagnetic compatibility	7
2.1.1.1 Electromagnetic susceptibility	7
2.2 Compliance	8
2.2.1 Electromagnetic compliance	8
2.3 European Union Restriction of Hazardous Substances (RoHS)	8
2.4 Reference documents	9
3.0 General description	11
3.1 Standard features	12
3.2 Media description	12
3.3 Performance	12
3.4 Reliability	13
3.5 Formatted capacities	13
3.6 Programmable drive capacity	13
3.7 Factory-installed options	13
4.0 Performance characteristics	15
4.1 Internal drive characteristics	15
4.2 Seek time	15
4.2.1 Access time	15
4.2.2 Format command execution time (minutes)	16
4.2.3 General performance characteristics	16
4.3 Start/stop time	16
4.4 Prefetch/multi-segmented cache control	17
4.5 Cache operation	17
4.5.1 Caching write data	18
4.5.2 Prefetch operation	18
5.0 Reliability specifications	19
5.1 Error rates	19
5.1.1 Recoverable Errors	19
5.1.2 Unrecoverable Errors	19
5.1.3 Seek errors	20
5.1.4 Interface errors	20
5.2 Reliability and service	20
5.2.1 Annualized Failrue Rate (AFR) and Mean time between failure (MTBF)	20
5.2.2 Preventive maintenance	20
5.2.3 Hot plugging the drive	20
5.2.4 S.M.A.R.T.	21
5.2.5 Thermal monitor	22
5.2.6 Drive Self Test (DST)	23
5.2.6.1 DST failure definition	23
5.2.6.2 Implementation	23
5.2.6.2.1 State of the drive prior to testing	23
5.2.6.2.2 Invoking DST	24
5.2.6.2.3 Short and extended tests	24
5.2.6.2.4 Log page entries	24
5.2.6.2.5 Abort	25
5.2.7 Product warranty	25
6.0 Physical/electrical specifications	27
6.1 AC power requirements	27
6.2 DC power requirements	27
6.2.1 Conducted noise immunity	31
6.2.2 Power sequencing	31
6.2.3 Current profiles	31
6.3 Power dissipation	34
6.4 Environmental limits	40
6.4.1 Temperature	40
6.4.2 Relative humidity	41
6.4.3 Effective altitude (sea level)	41
6.4.4 Shock and vibration	41
6.4.4.1 Shock	41
6.4.4.2 Vibration	43
6.4.5 Acoustics	43
6.4.6 Air cleanliness	43
6.4.7 Corrosive environment	43
6.4.8 Electromagnetic susceptibility	44
6.5 Mechanical specifications	44
7.0 Defect and error management	47
7.1 Drive internal defects/errors	47
7.2 Drive error recovery procedures	47
7.3 SAS system errors	49
7.4 Background Media Scan	49
7.5 Media Pre-Scan	49
7.6 Deferred Auto-Reallocation	50
7.7 Idle Read After Write	50
8.0 Installation	51
8.1 Drive orientation	51
8.2 Cooling	51
8.3 Drive mounting	53
8.4 Grounding	53
9.0 Interface requirements	55
9.1 SAS features	55
9.1.1 task management functions	55
9.1.2 task management responses	55
9.2 Dual port support	56
9.3 SCSI commands supported	57
9.3.1 Inquiry data	61
9.3.2 Mode Sense data	62
9.3.2.1 ST3450856SS/ST3450056SS Mode Sense data	63
9.3.2.2 ST3300656SS/ST3300056SS Mode Sense data	64
9.3.2.3 ST3146356SS/ST3146756SS Mode Sense data	65
9.4 Miscellaneous operating features and conditions	66
9.4.1 SAS physical interface	66
9.4.2 Physical characteristics	69
9.4.3 Connector requirements	69
9.4.4 Electrical description	70
9.4.5 Pin descriptions	70
9.4.6 SAS transmitters and receivers	71
9.4.7 Power	71
9.5 Signal characteristics	71
9.5.1 Ready LED Out	71
9.5.2 Differential signals	72
9.5.2.1 Eye masks	72
9.5.2.1.1 Eye masks overview	72
9.5.2.1.2 Receive eye mask	73
9.5.2.1.3 Jitter tolerance masks	73
9.5.2.2 Transmitter signal characteristics	75
9.5.2.3 Receiver signal characteristics	76
9.5.2.3.1 Jitter	76
9.5.2.3.2 Receiver jitter tolerance	77
9.5.2.3.3 Compliant jitter test pattern (CJTPAT)	77
9.5.2.3.4 Impedance specifications	77
9.5.2.4 Electrical TxRx connections	78
9.5.2.4.1 Transmitter characteristics	78
9.5.2.5 Receiver characteristics	81
10.0 Seagate Technology support services	83
Numerics	85
A	85
B	85
C	85
D	85
E	85
F	86
G	86
H	86
I	86
J	86
L	86
M	86
N	86
O	87
P	87
Q	87
R	87
S	87
T	88
U	88
V	88
W	88

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Cheetah 15K.6 SAS Product Manual, Rev. B

9.2

Dual port support

Cheetah 15K.6 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 run at the same link rate. The first port to successfully complete speed negotiation sets the link

rate support by both ports. When the second port participates in speed negotiation, it indicates the only sup-

ported speed is the speed selected by the first port. If the first port to complete speed negotiation looses sync

before the second port completes speed negotiation, both ports revert back to the power on condition of allow-

ing either link rate (1.5 or 3.0 Gbits/sec).

Subject to buffer availability, the Cheetah 15K.6 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.