Fujitsu M4000 User Manual download pdf (Page 52)

2-8 SPARC Enterprise M4000/M5000 Servers Overview Guide • December 2010

2.4 Reliability, Availability, and

Serviceability

Reliability, availability, and serviceability (RAS) are aspects of the system design that

affect the ability of the system to:

■ Operate without stopping

■ Remain accessible and usable

■ Minimize the time necessary to service the system

TABLE 2-2 defines each RAS feature.

2.4.1 Reliability

Reliability represents the length of time the midrange server can operate normally

without failure.

To improve quality, adequate components must be selected with consideration given

to the product service life and the required response in case of a failure. In

evaluations such as stress tests that check the service life, components and products

are inspected to determine whether they meet the target reliability levels.

Reliability is equally important to both hardware and software. Naturally,

trouble-free software is desired, but eliminating all software problems is difficult.

Installing the functions below leads to reliability improvements in the field.

■ Cooperates with XSCF firmware to periodically check whether the software,

including the domain OS, is running (host watchdog monitoring).

TABLE 2-2 RAS Definitions

RAS Feature Description

Reliability Length of time the midrange server can operate normally without

failure. The ability to detect failures with accuracy.

Availability Ratio of time during which the system is accessible and usable.

Serviceability Time required for the system to be recovered by specific

maintenance after a failure occurs.

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Fujitsu M4000 User Manual Page 52