Seagate ST32000646SS Constellation ES SAS Product Manual - Page 25

Constellation ES Series SAS Product Manual, Rev. F

17

S.M.A.R.T. measures error rates. All errors for each monitored attribute are recorded. A counter keeps track of

the number of errors for the current interval. This counter is referred to as the Failure Counter.

Error rate is the number of errors per operation. The algorithm that S.M.A.R.T. uses to record rates of error is to

set thresholds for the number of errors and their interval. If the number of errors exceeds the threshold before

the interval expires, the error rate is considered to be unacceptable. If the number of errors does not exceed

the threshold before the interval expires, the error rate is considered to be acceptable. In either case, the inter-

val and failure counters are reset and the process starts over.

Predictive failures

S.M.A.R.T. signals predictive failures when the drive is performing unacceptably for a period of time. The firm-

ware keeps a running count of the number of times the error rate for each attribute is unacceptable. To accom-

plish this, a counter is incremented each time the error rate is unacceptable and decremented (not to exceed

zero) whenever the error rate is acceptable. If the counter continually increments such that it reaches the pre-

dictive threshold, a predictive failure is signaled. This counter is referred to as the Failure History Counter.

There is a separate Failure History Counter for each attribute.

6.2.5

Thermal monitor

Constellation ES drives implement a temperature warning system which:

1.

Signals the host if the temperature exceeds a value which would threaten the drive.

2.

Signals the host if the temperature exceeds a user-specified value.

3.

Saves a S.M.A.R.T. data frame on the drive which exceeds the threatening temperature value.

A temperature sensor monitors the drive temperature and issues a warning over the interface when the tem-

perature exceeds a set threshold. The temperature is measured at power-up and then at ten-minute intervals

after power-up.

The thermal monitor system generates a warning code of 01-0B01 when the temperature exceeds the speci-

fied limit in compliance with the SCSI standard. The drive temperature is reported in the FRU code field of

mode sense data. You can use this information to determine if the warning is due to the temperature exceeding

the drive threatening temperature or the user-specified temperature.

This feature is controlled by the Enable Warning (EWasc) bit, and the reporting mechanism is controlled by the

Method of Reporting Informational Exceptions field (MRIE) on the Informational Exceptions Control (IEC)

mode page (1Ch).

The current algorithm implements two temperature trip points. The first trip point is set at 65°C which is the

maximum temperature limit according to the drive specification. The second trip point is user-selectable using

the Log Select command. The reference temperature parameter in the temperature log page (see Table 1) can

be used to set this trip point. The default value for this drive is 65°C, however, you can set it to any value in the

range of 0 to 65°C. If you specify a temperature greater than 65°C in this field, the temperature is rounded

down to 65°C. A sense code is sent to the host to indicate the rounding of the parameter field.

Table 1:

Temperature Log Page (0Dh)

Parameter Code

Description

0000h

Primary Temperature

0001h

Reference Temperature

Section	Page
1.0 Seagate Technology support services	9
2.0 Scope	10
3.0 Applicable standards and reference documentation	11
3.1 Standards	11
3.1.1 Electromagnetic compatibility	11
3.1.1.1 Electromagnetic susceptibility	11
3.1.2 Electromagnetic compliance	12
3.1.3 European Union Restriction of Hazardous Substances (RoHS)	13
3.2 Reference documents	13
4.0 General description	14
4.1 Standard features	15
4.2 Media description	15
4.3 Performance	16
4.4 Reliability	16
4.5 Formatted capacities	16
4.6 Programmable drive capacity	16
4.7 Factory-installed options	17
5.0 Performance characteristics	18
5.1 Internal drive characteristics	18
5.2 Seek performance characteristics	18
5.2.1 Access time	18
5.2.2 Format command execution time for 512-byte sectors (minutes)	19
5.2.3 General performance characteristics	19
5.3 Start/stop time	19
5.4 Prefetch/multi-segmented cache control	20
5.5 Cache operation	20
5.5.1 Caching write data	21
5.5.2 Prefetch operation	21
6.0 Reliability specifications	22
6.1 Error rates	22
6.1.1 Recoverable Errors	22
6.1.2 Unrecoverable Errors	22
6.1.3 Seek errors	23
6.1.4 Interface errors	23
6.2 Reliability and service	23
6.2.1 Annualized Failure Rate (AFR) and Mean Time Between Failure (MTBF)	23
6.2.2 Preventive maintenance	23
6.2.3 Hot plugging the drive	23
6.2.4 S.M.A.R.T.	24
6.2.5 Thermal monitor	25
6.2.6 Drive Self Test (DST)	26
6.2.6.1 DST failure definition	26
6.2.6.2 Implementation	26
6.2.7 Product warranty	28
7.0 Physical/electrical specifications	29
7.1 PowerChoiceTM power management	29
7.1.1 PowerChoice reporting methods	30
7.2 AC power requirements	30
7.3 DC power requirements	30
7.3.1 Conducted noise immunity	34
7.3.2 Power sequencing	34
7.3.3 Current profiles	35
7.4 Power dissipation	38
7.5 Environmental limits	44
7.5.1 Temperature	44
7.5.2 Relative humidity	44
7.5.3 Effective altitude (sea level)	45
7.5.4 Shock and vibration	45
7.5.4.1 Shock	45
7.5.4.2 Vibration	46
7.5.5 Acoustics	47
7.5.6 Air cleanliness	47
7.5.7 Corrosive environment	47
7.5.8 Electromagnetic susceptibility	47
7.6 Mechanical specifications	48
8.0 About FIPS	49
9.0 About self-encrypting drives	50
9.1 Data encryption	50
9.2 Controlled access	50
9.2.1 Admin SP	50
9.2.2 Locking SP	51
9.2.3 Default password	51
9.3 Random number generator (RNG)	51
9.4 Drive locking	51
9.5 Data bands	51
9.6 Cryptographic erase	52
9.7 Authenticated firmware download	52
9.8 Power requirements	52
9.9 Supported commands	52
10.0 Defect and error management	53
10.1 Drive internal defects/errors	53
10.2 Drive error recovery procedures	53
10.3 SAS system errors	54
10.4 Background Media Scan	55
10.5 Media Pre-Scan	55
10.6 Deferred Auto-Reallocation	55
10.7 Idle Read After Write	56
11.0 Installation	57
11.1 Drive orientation	57
11.2 Cooling	58
11.3 Drive mounting	59
11.4 Grounding	59
12.0 Interface requirements	60
12.1 SAS features	60
12.1.1 task management functions	60
12.1.2 task management responses	60
12.2 Dual port support	61
12.3 SCSI commands supported	62
12.3.1 Inquiry data	66
12.3.2 Mode Sense data	66
12.4 Miscellaneous operating features and conditions	71
12.4.1 SAS physical interface	72
12.4.2 Physical characteristics	75
12.4.3 Connector requirements	75
12.4.4 Electrical description	75
12.4.5 Pin descriptions	75
12.4.6 SAS transmitters and receivers	76
12.4.7 Power	76
12.5 Signal characteristics	76
12.5.1 Ready LED Out	76
12.5.2 Differential signals	77
12.6 SAS-2 Specification Compliance	77
12.7 Additional information	77
Numerics	79
A	79
B	79
C	79
D	79
E	80
F	80
G	80
H	80
I	80
J	80
K	80
L	81
M	81
N	81
O	81
P	81
Q	81
R	82
S	82
T	82
U	82
V	83
W	83

Seagate ST32000646SS Constellation ES SAS Product Manual - Page 25

Predictive failures, Thermal monitor, Table 1, Temperature Log Dh, Parameter Code, Description

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