IBM DTTA-351010 Hard Drive Specifications - Page 87

S.M.A.R.T. Function

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Mode Active Idle Standby Sleep BSY RDY Interface active x x Yes 0 1 Yes 0 1 Yes 0 1 No Media Active Active Inactive Inactive Figure 66. Power conditions Ready(RDY) is not a power condition. A device may post ready at the interface even though the media may not be accessible. 10.6 S.M.A.R.T. Function The intent of Self-monitoring, analysis and reporting technology (S.M.A.R.T) is to protect user data and prevent unscheduled system downtime that may be caused by predictable degradation and/or fault of the device. By monitoring and storing critical performance and calibration parameters, S.M.A.R.T devices employ sophisticated data analysis algorithms to predict the likelihood of near-term degradation or fault condition. By alerting the host system of a negative reliability status condition, the host system can warn the user of the impending risk of a data loss and advise the user of appropriate action. 10.6.1 Attributes Attributes are the specific performance or calibration parameters that are used in analyzing the status of the device. Attributes are selected by the device manufacturer based on that attribute's ability to contribute to the prediction of degrading or faulty conditions for that particular device. The specific set of attributes being used and the identity of these attributes is vendor specific and proprietary. 10.6.2 Attribute values Attribute values are used to represent the relative reliability of individual performance or calibration attributes. The valid range of attribute values is from 1 to 253 decimal. Higher attribute values indicate that the analysis algorithms being used by the device are predicting a lower probability of a degrading or faulty condition existing. Accordingly, lower attribute values indicate that the analysis algorithms being used by the device are predicting a higher probability of a degrading or faulty condition existing. 10.6.3 Attribute thresholds Each attribute value has a corresponding attribute threshold limit which is used for direct comparison to the attribute value to indicate the existence of a degrading or faulty condition. The numerical value of the attribute thresholds are determined by the device manufacturer through design and reliability testing and analysis. Each attribute threshold represents the lowest limit to which its corresponding attribute value can be equal while still retaining a positive reliability status. Attribute thresholds are set at the device manufacturer's factory and cannot be changed in the field. The valid range for attribute thresholds is from 1 through 253 decimal. 10.6.4 Threshold exceeded condition If one or more attribute values, whose Pre-failure bit of their status flag is set, are less than or equal to their corresponding attribute thresholds, then the device reliability status is negative, indicating an impending degrading or faulty condition. General Operation Descriptions 79

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Mode
BSY
RDY
Interface active
Media
Active
x
x
Yes
Active
Idle
0
1
Yes
Active
Standby
0
1
Yes
Inactive
Sleep
0
1
No
Inactive
Figure 66. Power conditions
Ready(RDY) is not a power condition. A device may post ready at the interface even though the media may
not be accessible.
10.6 S.M.A.R.T. Function
The intent of Self-monitoring, analysis and reporting technology (S.M.A.R.T) is to protect user data and
prevent unscheduled system downtime that may be caused by predictable degradation and/or fault of the
device. By monitoring and
storing
critical performance
and
calibration
parameters,
S.M.A.R.T
devices
employ sophisticated data analysis algorithms to predict the likelihood of near-term degradation or fault con-
dition. By alerting the host system of a negative reliability status condition, the host system can warn the
user of the impending risk of a data loss and advise the user of appropriate action.
10.6.1
Attributes
Attributes are the specific performance or calibration parameters that are used in analyzing the status of the
device. Attributes are selected by the device manufacturer based on that attribute's ability to contribute to
the prediction of degrading or faulty conditions for that particular device.
The specific set of attributes being
used and the identity of these attributes is vendor specific and proprietary.
10.6.2
Attribute values
Attribute values are used to represent the relative reliability of individual performance or calibration attri-
butes. The valid range of attribute values is from 1 to 253 decimal.
Higher attribute values indicate that the
analysis algorithms being used by the device are predicting a lower probability of a degrading or faulty condi-
tion existing.
Accordingly, lower attribute values indicate that the analysis algorithms being used by the
device are predicting a higher probability of a degrading or faulty condition existing.
10.6.3
Attribute thresholds
Each attribute value has a corresponding attribute threshold limit which is used for direct comparison to the
attribute value to indicate the existence of a degrading or faulty condition.
The numerical value of the attri-
bute thresholds are determined by the device manufacturer through design and reliability testing and analysis.
Each attribute threshold represents the lowest limit to which its corresponding attribute value can be equal
while still retaining a positive reliability status. Attribute thresholds are set at the device manufacturer's
factory and cannot be changed in the field. The valid range for attribute thresholds is from 1 through 253
decimal.
10.6.4
Threshold exceeded condition
If one or more attribute values, whose Pre-failure bit of their status flag is set, are less than or equal to their
corresponding attribute thresholds, then the device reliability status is negative, indicating an impending
degrading or faulty condition.
General Operation Descriptions
79