Reliability And Service; Annualized Failure Rate (Afr) And Mean Time Between Failure (Mtbf); Preventive Maintenance; Hot Plugging The Drive - Seagate ST2400MM0129 Product Manual

5.2

Reliability and service

The reliability of Seagate Enterprise Performance 10K HDD disk drives can be enhanced 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.
5.2.1

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

The production disk drive shall achieve an annualized failure-rate of 0.44% (MTBF of 2,000,000 hours) over a 5 year service life when
used in Enterprise Storage field conditions as limited by the following:
• 8760 power-on hours per year.
• HDA temperature as reported by the drive <= 50°C
• Ambient wet bulb temp <= 26°C
• Typical workload
• The AFR (MTBF) is a population statistic not relevant to individual units.
• ANSI/ISA S71.04-2013 G2 classification levels and dust contamination to ISO 14644-1 Class 8 standards (as measured at the
device)
The MTBF specification for the drive assumes the operating environment is designed to maintain nominal drive temperature and
humidity. Occasional excursions in operating conditions between the rated MTBF conditions and the maximum drive operating
conditions may occur without significant impact to the rated MTBF. However continual or sustained operation beyond the rated
MTBF conditions will degrade the drive MTBF and reduce product reliability.
5.2.2

Preventive maintenance

No routine scheduled preventive maintenance is required.
5.2.3

Hot plugging the drive

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.
It is the responsibility of the systems integrator to assure that no temperature, energy, voltage hazard,
shorting of PCBA to ground, or ESD potential hazard is presented during the hot connect/disconnect
Note
operation. Discharge the static electricity from the drive carrier prior to inserting it into the system.
The drive motor must come to a complete stop prior to changing the
Caution
plane of operation. This time is required to insure data integrity.
5.2.4 S.M.A.R.T.
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.
The drive's firmware monitors specific attributes for degradation
Note
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.
Seagate Enterprise Performance 10K HDD v9 Product Manual, Rev. D (Draft 2) 20