Compaq HSZ80 manual Charging Diagnostics, Battery Hysteresis

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Charging Diagnostics

Whenever you restart the controller, its diagnostic routines automatically check the charge in the ECB’s batteries. If the batteries are fully charged, the controller reports them as fully charged and rechecks them every 24 hours. If the batteries are charging, the controller rechecks them every 4 minutes. Batteries are reported as being either above or below 50 percent in capacity. Batteries below 50 percent in capacity are also referred to as being low.

This 4-minute polling continues for up to 10 hours—the maximum time it should take to recharge the batteries. If the batteries have not been charged sufficiently after 10 hours, the controller declares them to be failed.

Battery Hysteresis

When charging a battery, write-back caching will be allowed as long as a previous down time has not drained more than 50 percent of a battery’s capacity. When a battery is operating below 50 percent capacity, the battery is considered to be low and write-back caching is disabled.

CAUTION: Compaq recommends that you replace the ECB every two years to prevent battery failure.

IMPORTANT: If a UPS is used for backup power, the controller does not check the battery. To set the subsystem to use a UPS or to instruct the controller on per- forming regular battery checks, see “SET controller” in Chapter 5, “CLI Com- mands.”

Compaq HSZ80 Array Controller ACS Version 8.3 Configuration and CLI Reference Guide