Seagate ST600MP0084 - 4K ユーザーズマニュアル

S

EAGATE 

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NTERPRISE 

P

ERFORMANCE 

15K HDD 

AND 

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NTERPRISE 

T

URBO 

SSHD SAS P

RODUCT 

M

ANUAL

, R

EV

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 13

  

The production disk drive shall achieve an AFR of 0.44% (MTBF of  2,000,000 hours) when operated in an environment that ensures  the 

HDA case temperatures do not exceed the values specified in Secti on 6.5. Operation at case temperatures outside the specificati ons in 

Section 6.5 may increase the product AFR (decrease the MTBF). The AFR (MTBF) is a population statistic not relevant to individual units.

The AFR (MTBF) specification is based on the following assumptions:
• 8760 power-on hours per year.
• 250 average on/off cycles per year.
• Operations at nominal voltages.
• Systems will provide adequate cooling to ensure the case temperatures specified in Section 6.5 are not exceeded. Temperatures outside 

the specifications in Section 6.5 will increase the product AFR and decrease the MTBF.

No routine scheduled preventive maintenance is required.

When a disk is powered on by switching the power or hot plugged, the drive runs a self test before attempting to communicate on its’ 

interfaces. When the self test completes successfully, the drive initiates a Link Reset starting with OOB. An attached device should 

respond to the link reset. If the link reset attempt fails, or any time the drive looses sync, the drive initiated link reset.  The drive will initiate 

link reset once per second but alternates between port A and B. Therefore each port will attempt a link reset once per 2 seconds assuming 

both ports are out of sync.

If the self-test fails, the drive does not respond to link reset on the failing port.
Note.

It is the responsibility of the systems integrator to assure that no temperature, energy, voltage hazard, or ESD potential hazard 

is presented during the hot connect/disconnect operation. Discharge the static electricity from the drive carrier prior to inse rt-

ing it into the system.

The drive motor must come to a complete stop prior to changing the plane of operation. This time is required to insure data 

integrity.

S.M.A.R.T. is an acronym for Self-Monitoring Analysis and Reporting Technology. This technology is intended to recognize conditions that 

indicate imminent drive failure and is designed to provide sufficient warning of a failure to allow an application to back up the data before an 

actual failure occurs.
Note.

The drive’s firmware monitors specific attributes for degradation over time but can’t predict instantaneous drive failures.

Each monitored attribute has been selected to monitor a specific set of failure conditions in the operating performance of the drive and the 

thresholds are optimized to minimize “false” and “failed” predictions.

Controlling S.M.A.R.T.
The operating mode of S.M.A.R.T. is controlled by the DEXCPT and PERF bits on the Informational Exceptions Control mode page (1Ch). 

Use the DEXCPT bit to enable or disable the S.M.A.R.T. feature. Setting the DEXCPT bit disables all S.M.A.R.T. functions. When enabled, 

S.M.A.R.T. collects on-line data as the drive performs normal read and write operations. When the PERF bit is set, the drive is considered 

to be in “On-line Mode Only” and will not perform off-line functions.

Applications can measure off-line attributes and force the drive  to save the data by using the Rezero Unit command. Forcing S.M .A.R.T. 

resets the timer so that the next scheduled interrupt is in one hour.

Applications can interrogate the drive through the host to determine the time remaining before the next scheduled measurement and data 

logging process occurs. To accomplish this, issue a Log Sense command to log page 0x3E. This allows applications to control when 

S.M.A.R.T. interruptions occur. Forcing S.M.A.R.T. with the RTZ command resets the timer.

Performance impact
S.M.A.R.T. attribute data is saved to the disk 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 disk is interruptable. The maximum on-line only processing delay is summarized below:

S.M.A.R.T. delay times

70 milliseconds