HP StorageWorks HSG60 and HSG80 Array Controller and Array Controller Software Troubleshooting Guide (EK-G80TS-SA. C01, March 2005)

Troubleshooting Information
42 HSG60 and HSG80 Array Controller and Array Controller Software Troubleshooting Guide
ECB charging diagnostics
After restarting the controller, the 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 the battery every 24 hours. If the battery is
charging, the controller rechecks the battery every 4 minutes. A battery is reported
as being either above or below 50 percent capacity. A battery below 50 percent
capacity is referred to as low.
The 4-minute polling continues for the maximum allowable time to recharge the
battery—up to 10 hours for a BA370 enclosure, or 3 1/2 hours for a Model 2100
or 2200 enclosure. If the battery does not charge sufficiently after the allotted
time, the controller declares the battery as failed.
Battery hysteresis
If you are charging an ECB battery, writeback caching is allowed as long as a
previous downtime did not drain more than 50 percent battery capacity. If an ECB
battery is operating below 50 percent capacity, the battery is considered to be low
and writeback caching is disabled.
ECB battery capacity depends on the size of the cache module memory
configuration as shown in Table 7. For example, after the batteries are fully
charged, an ECB can preserve 512 MB of cache memory for 24 hours.
Caution: HP recommends replacing the ECB every 3 1/2 years to prevent
battery failure. If you are shutting down your controller for longer than one
day, complete the additional steps in "Shutting Down the Subsystem" in the
HP
StorageWorks HSG60 and HSG80 Array Controller and Array Controller
Software Maintenance and Service Guide
. This prevents the ECB from
discharging during planned power outages.
Table 7: ECB Capacity Based on Memory Size
Size DIMM Combinations Capacity in Hours (Days)
128 MB Four, 32 MB each 96 (4)
128 MB One, 128 MB each 96 (4)
256 MB Two, 128 MB each 48 (2)
512 MB Four, 128 MB each 24 (1)