User Guide

Intel® Integrated RAID Solution User Guide 7
Operation of Mirrored Volumes
The Intel
®
Integrated RAID Solution supports one or two mirrored volumes on each Intel
SAS-3 controller (or one mirrored volume and one Integrated Striping volume). Typically,
one of these volumes is the boot volume. Boot support is available through the firmware
of the Intel SAS-3 controller that supports the standard Fusion-MPT interface. The run-
time mirroring of the boot disk is transparent to the BIOS, the drivers, and the operating
system. Host-based status software monitors the state of the mirrored disks and reports
any error conditions. The following figure shows an Integrated Mirroring volume in
which the second disk is a mirrored copy of the data on the first (primary) disk.
Figure 1. Typical Integrated Mirroring Implementation
The following figure shows the logical view and physical view of an Integrated Mirroring
volume. Each logical block address (LBA) is mirrored on the second disk.
Figure 2. Integrated Mirroring Volume
Primary Mirror
Integrated Mirroring Volume
SAS
Intel
Fusion-MPT
SAS3 Controller
Memory Bus
NVSRAM
(For Write Journaling)
FLASH
(For Configuration)
3_01274-00
3_00007-00
LBA 1
LBA 2
LBA 3
LBA N
LBA 1
LBA 2
LBA 3
LBA N
LBA 1'
LBA 2'
LBA 3'
LBA N’
+
Physical ViewLogical View