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E-16 Understanding Drive Arrays
Writer: Rickard Project: Compaq Smart Array 3200 Controller Reference Guide Comments: 340862-002
File Name: L-APPE.DOC Last Saved On: 12/7/98 9:30 AM
COMPAQ CONFIDENTIAL - NEED TO KNOW REQUIRED
Batteries
The Array Accelerator contains batteries that maintain any data cached there if a
system power failure occurs. The batteries can preserve data in the Array
Accelerator for up to four days. When power is restored to the system, an
initialization process writes the preserved data to the disk drives.
The cells used in the Array Accelerator batteries are recharged with a “trickle”
charge applied while system power is present. If posted Writes were stored in
the memory of the Array Accelerator and power loss occurs, you must reinstate
power within approximately four days or the data stored in the memory will be
lost. This depends on the present condition of the Array Accelerator batteries.
IMPORTANT: It is possible for the batteries to be depleted when you install
a new Smart Array 3200 Controller. It can take up to 36 hours of system
operation to fully charge the batteries. In this case, only the Array Accelerator
is affected; your system will continue to run without interruption.
During Power-On Self-Test (POST), the Smart Array 3200 Controller checks
the batteries. If the battery charge is low or depleted, a 1794 POST error
message displays, indicating that the Array Accelerator is disabled. The
controller temporarily disables the Array Accelerator until the batteries reach 90
percent charge. The board continues to function properly, but at a slightly lower
performance until the batteries reach 90 percent charge. At this point, the Array
Accelerator is enabled automatically.