User`s guide

Integrated Mirroring Overview 11
Figure 2-2. Integrated Mirroring with Two Disks (Mirroring Configuration)
Fig 2-3 shows the logical view and physical view of SCSI configuration when there are two disks in
the system.
Figure 2-3. Integrated Mirroring with Two Disks (SCSI Configuration)
Dell, Inc. provides the BIOS-based configuration utility to enable the user to configure the
mirroring attributes during initial setup and to reconfigure them in response to hardware failures or
changes in the environment.
Integrated Mirroring Firmware
This section describes features of the PERC 4/IM firmware.
Host Interface
Through the Fusion-MPT interface, the host OS has access to the logical IM drive as well as the
physical disks. This allows support for domain validation and Ultra320 SCSI expander
configuration.
LBA 1
LBA 2
LBA 3
LBA N
+
Logical View
Physical View
LBA 1’
LBA 2’
LBA 3’
LBA N’
LBA 1
LBA 2
LBA 3
LBA N
LBA 1
LBA 2
LBA 3
LBA N
+
Logical View
Physical View
LBA x
LBA x
LBA x
LBA N’
LBA 1
LBA 2
LBA 3
LBA N
LBA x
LBA x
LBA x
LBA N