User Manual

Constellation ES.3 SAS Product Manual, Rev. F 18

5.2 Reliability and service

Users can enhance the reliability of Constellation ES.3 disk 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.

5.2.1 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 <= 40°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 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, 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.

Nonrecoverable read errors 1 per 10

bits read, max

Load unload cycles 600,000 cycles

Maximum Rated Workload Maximum rate of <550TB/year

Workloads exceeding the annualized rate may degrade the drive MTBF and impact product reliability. The

Annualized Workload Rate is in units of TB per year, or TB per 8760 power on hours. Workload Rate = TB trans-

ferred * (8760 / recorded power on hours).

Warranty

To determine the warranty for a specific drive, use a web browser to access the following web page:

http://www.sea

gate.com/support/warranty-and-replacements/.

From this page, click on the “Is my Drive under Warranty” link. The following are required to be provided: the

drive serial number, model number (or part number) and country of purchase. The system will display the war-

ranty information for the drive.

Preventive maintenance None required.

Caution

The drive motor must come to a complete stop prior to changing the plane of operation.

This time is required to insure data integrity.