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The IM feature uses the same device drivers as the standard LSI Logic Fusion-MPT based controllers,
providing seamless and transparent fault tolerance. This eliminates the need for complex backup software
or expensive RAID hardware. The IM feature operates independently from the operating system, in order
to conserve system resources. The BIOS based configuration utility makes it easy to configure IM and
IME volumes.
The Integrated Mirroring feature is currently available as an optional component of the Fusion-MPT
architecture on LSI Logic controller products.
5.1.2.2 IM Features
LSI Logic Integrated Mirroring and Integrated Mirroring Enhanced support the following features:
Configurations of one or two IM or IME volumes on the same LSI Logic SAS controller. Each volume
can consist of two mirrored disks (IM) or three to eight mirrored disks (IME).
(Optional) One global hot spare disk per controller. If a global hot spare disk is defined, the upper
limit for an IME volume is seven mirrored disks.
Mirrored volumes run in optimal mode or in degraded mode (if one mirrored disk fails).
Hot swap capability.
Presents a single virtual drive to the OS for each IM/IME volume.
Supports both SAS and SATA disks, although the two types of disks cannot be combined on the
same LSI Logic SAS controller.
Fusion-MPT architecture.
Easy-to-use BIOS-based configuration utility (and DOS-based configuration utility for manufacturing
use only).
Error notification: OS-specific event log updated by drivers and errors displayed inside the Fusion-
MPT BIOS.
SES status LED support for Integrated Mirroring disks.
Write journaling, which allows automatic synchronization of potentially inconsistent data after
unexpected power-down situations.
Metadata used to store volume configuration on mirrored disks.
Automatic background resynchronization while host I/Os continue.
Background media verification ensures that data on the IM volume is accessible.
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