Specifications

4–2 Compaq StorageWorks HSG80 Array Controller ACS Version 8.5 Maintenance and Service Guide
event report. This report will contain an instance code, located at offset 32 through 35,
that can be used to determine the cause of the error. See “Translating Event Codes” on
page 4–29 for help on translating instance codes.
ECB Charging Diagnostics
Whenever restarting the controller, its diagnostic routines automatically check the charge
of each ECB battery. If the battery is fully charged, the controller reports the battery as
good and rechecks it every 24 hours. If the battery is charging, the controller rechecks it
every four minutes. A battery is reported as being either above or below 50 percent in
capacity. A battery below 50 percent in capacity is referred to as being low.
The four-minute polling continues for up to 10 hours—the maximum time it should take to
recharge the battery. If the battery does not charge sufficiently after 10 hours, the
controller declares it as “failed.”
Battery Hysteresis
When charging an ECB battery, write-back caching is allowed as long as a previous down
time did not drain more than 50 percent of ECB battery capacity. When an ECB battery is
operating below 50 percent capacity, it is considered to be low and write-back caching is
disabled.
CAUTION: Compaq recommends replacing an ECB every two years to prevent battery
failure.
NOTE: If an uninterruptable power supply (UPS) is set to DATACENTER_WIDE, the controller
does not check the battery. See the
Compaq StorageWorks HSG80 Array Controller ACS Version
8.5 Configuration Guide
and HSG80 Array Controller ACS Version 8.5 CLI Reference Guide for
information about the UPS switches.