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