Intel RS3FC044 User Guide - Page 20

Media Verification, Disk Write Caching, NVSRAM Usage, Background Initialization, Consistency Check

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After you replace the disk drives and run the OCE command, you must use a commercial tool specific to the operating system to move, or increase the size of, the partition on the volume. Media Verification The Integrated RAID firmware supports a background media verification feature that runs at regular intervals when the mirrored volume is in the Optimal state. If the verification command fails for any reason, the firmware reads the other disk's data for this segment and writes it to the failing disk in an attempt to refresh the data. The firmware periodically writes the current media verification logical block address to nonvolatile memory so the media verification can continue from where it stopped prior to a power cycle. Disk Write Caching By default, the Integrated RAID firmware disables disk write caching for mirrored volumes to make sure that the write journal entry stored in nonvolatile static RAM (NVSRAM) is always valid. If you enable disk write caching (not recommended), you might cause the disk write log to be invalid. NVSRAM Usage The Integrated RAID firmware requires at least a 32-KB NVSRAM to perform write journaling for mirrored volumes on Intel SAS-3 controllers. The NVSRAM also preserves configuration information across reboots. The firmware uses write journaling to verify that the disks in the mirrored volume are synchronized with each other. Background Initialization Background initialization (BGI) is the process of copying data from primary to secondary disks in a mirrored volume. The Integrated RAID firmware starts BGI automatically as a background task when it creates a volume. The volume remains in the Optimal state while BGI is in progress. Consistency Check A consistency check is a background process that reads data from primary and secondary disks in a mirrored volume and compares it to make sure the data is identical on both disks. Use the Intel SAS-3 BIOS Configuration Utility to run a consistency check on a mirrored volume. 10 Intel® Integrated RAID Solution User Guide

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10
Intel®
Integrated RAID Solution User Guide
After you replace the disk drives and run the OCE command, you must use a commercial
tool specific to the operating system to move, or increase the size of, the partition on the
volume.
Media Verification
The Integrated RAID firmware supports a background media verification feature that runs
at regular intervals when the mirrored volume is in the Optimal state. If the verification
command fails for any reason, the firmware reads the other disk’s data for this segment
and writes it to the failing disk in an attempt to refresh the data. The firmware periodically
writes the current media verification logical block address to nonvolatile memory so the
media verification can continue from where it stopped prior to a power cycle.
Disk Write Caching
By default, the Integrated RAID firmware disables disk write caching for mirrored
volumes to make sure that the write journal entry stored in nonvolatile static RAM
(NVSRAM) is always valid. If you enable disk write caching (not recommended), you
might cause the disk write log to be invalid.
NVSRAM Usage
The Integrated RAID firmware requires at least a 32-KB NVSRAM to perform write
journaling for mirrored volumes on Intel SAS-3 controllers. The NVSRAM also preserves
configuration information across reboots. The firmware uses write journaling to verify
that the disks in the mirrored volume are synchronized with each other.
Background Initialization
Background initialization (BGI) is the process of copying data from primary to secondary
disks in a mirrored volume. The Integrated RAID firmware starts BGI automatically as a
background task when it creates a volume. The volume remains in the Optimal state while
BGI is in progress.
Consistency Check
A consistency check is a background process that reads data from primary and secondary
disks in a mirrored volume and compares it to make sure the data is identical on both
disks. Use the Intel SAS-3 BIOS Configuration Utility to run a consistency check on a
mirrored volume.