Users Guide

NOTE: The controller automatically reverts a hot spare only if the failed disk is replaced with a new

disk in the same slot. If the new disk is not placed in the same slot, a manual Replace Member

operation can be used to revert a previously commissioned hot spare.

NOTE: A Replace Member operation typically causes a temporary impact to disk performance.

Once the operation completes, performance returns to normal.

Controller Cache Preservation

The controller is capable of preserving its cache in the event of a system power outage or improper

system shutdown. The PERC H710, H710P, and H810 controllers are attached to a Battery Backup Unit

(BBU) that provides backup power during system power loss to preserve the controller's cache data.

Cache Preservation With NVC

The Non-Volatile Cache (NVC) allows controller cache data to be stored indefinitely. If the controller has

data in the cache memory during a power outage or improper system shutdown, a small amount of

power from the battery is used to transfer the cache data to a non-volatile flash storage where it remains

until power is restored and the system is booted.

Recovering Cache Data

The dirty cache LED that is located on the H710 and H810 cards can be used to determine if cache data is

being preserved.

If a system power loss or improper system shutdown has occurred:

1. Restore the system power.

2. Boot the system.

3. To enter the BIOS Configuration Utility, select Managed Preserved Cache in the controller menu.

If there are no virtual disks listed, all preserved cache data has been written to disk successfully.

Battery Transparent Learn Cycle

A transparent learn cycle is a periodic operation that calculates the charge that is remaining in the battery

to ensure there is sufficient energy. The operation runs automatically, and causes no impact to the

system or controller performance.

The controller automatically performs the Transparent Learn Cycle (TLC) on the battery to calibrate and

gauge its charge capacity once every 90 days. The operation can be performed manually, if required.

NOTE: Virtual disks stay in Write Back mode, if enabled, during transparent learn cycle. When the

TLC completes, the controller sets the next TLC to +90 days.

TLC time frame

The time frame for completion of a learn cycle is a function of the battery charge capacity and the

discharge and charge currents used.