Seagate ST600MP0084 - 4K ユーザーズマニュアル

S

EAGATE 

E

NTERPRISE 

P

ERFORMANCE 

15K HDD 

AND 

E

NTERPRISE 

T

URBO 

SSHD SAS P

RODUCT 

M

ANUAL

, R

EV

. B

 

 14

  

Reporting control
Reporting is controlled by the MRIE bits  in the Informational Exceptions Control mode  page (1Ch). Subject to the reporting meth od. 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 attri bute. 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 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 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 run ning count 

of the number of times the error rate for each attribute is unacceptable. To accomplish this, a counter is incremented each tim e the error 

rate is unacceptable and decremented (not to  exceed zero) whenever the error rate is  acceptable. If the counter continually inc rements 

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.

Enterprise Performance 15K HDD and Enterprise Turbo SSHD drives implement a temperature warning system which:
1. Signals the host if the temperature exceeds a value which would threaten the drive.
2. 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.

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).

[a]. Do not reset the log parameter.
[b]. Do not make any requested changes in any field in any log parameter in any log page.

0000h

Primary Temperature

Mandatory

0001h

Reference Temperature

Optional