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ANUAL
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Performance impact
S.M.A.R.T. attribute data is saved to the media so that the events that caused a predictive failure can be recreated. The drive measures
and saves parameters once every hour subject to an idle period on the drive interfaces. The process of measuring off-line attribute data
and saving data to the media is interruptible. The maximum on-line only processing delay is summarized below
Reporting control
Reporting is controlled by the MRIE bits in the Informational Exceptions Control mode page (1Ch). Subject to the reporting method. For
example, if the MRIE is set to one, the firmware will issue to the host an 01-5D00 sense code. The FRU field contains the type of predictive
failure that occurred. The error code is preserved through bus resets and power cycles.
Determining rate
S.M.A.R.T. monitors the rate at which errors occur and signals a predictive failure if the rate of degraded errors increases to an
unacceptable level. To determine rate, error events are logged and compared to the number of total operations for a given attribute. The
interval defines the number of operations over which to measure the rate. The counter that keeps track of the current number of operations
is referred to as the Interval Counter.
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 appropriate 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 interval 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 firmware keeps a running count
of the number of times the error rate for each attribute is unacceptable. To accomplish 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 predictive 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.
5.3.5
Thermal monitor
Pulsar.2 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. (i.e., the reference temperature 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 temperature 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 specified limit in compliance with
the SCSI standard. The drive temperature is reported in the FRU code field of MODE SENSE data. Administrators 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 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 8) can be used to set this trip point. The default value for this drive is listed in the table, however,
applications can set it to any value in the range defined. If a temperature is specified that is greater than the maximum allowed in this field,
the temperature is rounded down to the maximum allowed. A sense code is sent to the host to indicate the rounding of the parameter field.
Maximum processing delay
Fully-enabled delay
DEXCPT = 0
S.M.A.R.T. delay times
75 ms
