Ssd Percentage Used Endurance Indicator; Reliability And Service; Annualized Failure Rate (Afr) And Mean Time Between Failure (Mtbf); Preventive Maintenance - Seagate ST400FM0323 Product Manual

5.2.6

SSD Percentage Used Endurance Indicator

An application can interrogate the drive through the host to determine an estimate of the percentage of device life that has been
used. To accomplish this, issue a LOG SENSE command to log page 0x11. This allows applications to read the contents of the
Percentage Used Endurance Indicator parameter code. The Percentage Used Endurance Indicator is defined in the T10 document
SBC-3 available from the T10 committee.
5.3

Reliability and service

Integrators can enhance the reliability of Seagate 1200.2 SAS SSD drives by ensuring that the drive receives adequate cooling.
Section 6.0 provides temperature measurements and other information that may be used to enhance the service life of the drive.
Section 10.2 provides recommended air-flow information.
5.3.1

Annualized Failure Rate (AFR) and Mean Time Between Failure (MTBF)

The production drive shall achieve an AFR of 0.35% (MTBF of 2,500,000 hours) when operated in an environment that ensures the
case temperatures do not exceed the values specified in Section 6.3. Operation at case temperatures outside the specifications in
Section 6.3 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 for Enterprise Storage System environments:
• 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 6.3 are not exceeded. Temperatures
outside the specifications in Section 6.3 will increase the product AFR and decrease the MTBF.
5.3.2

Preventive maintenance

No routine scheduled preventive maintenance is required.
5.3.3

Hot plugging the drive

When a drive 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 inserting it into the system.
Seagate 1200.2 SAS SSD Product Manual, Rev. A 23