HP Xw8200 LSI SCSI: Integrated RAID User's Guide (PCI plug-in and system board - Page 17

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• Automatic background resynchronization while host I/Os continue • Media verification 2.3 Description The LSI Logic Integrated Mirroring (IM) feature provides mirroring for the boot volume, as shown in Figure 2.1. This is accomplished through the firmware of an LSI Logic controller that supports the standard FusionMPT interface. The runtime mirroring of the boot disk is transparent to the BIOS, drivers, and operating system. Host-based status software monitors the state of the mirrored disks and reports any error conditions. In Figure 2.1 the system is configured with a second disk as a mirror of the first (primary) disk. Figure 2.1 Typical Mainboard Implementation Two Disk Drives Internal SCSI OS Mirrored OS External SCSI LSI Logic Fusion-MPT Controller Memory Bus NVSRAM (For Write Journaling) EEPROM (For Configuration) Figure 2.2 shows the logical view and physical view of the mirroring configuration when there are two disks in the mirrored volume. Description Version 1.0 Copyright © 2003 by LSI Logic Corporation. All rights reserved. 2-3

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Description
2-3
Version 1.0
Copyright © 2003 by LSI Logic Corporation. All rights reserved.
•
Automatic background resynchronization while host I/Os continue
•
Media verification
2.3
Description
The LSI Logic Integrated Mirroring (IM) feature provides mirroring for the
boot volume, as shown in
Figure 2.1
. This is accomplished through the
firmware of an LSI Logic controller that supports the standard Fusion-
MPT interface. The runtime mirroring of the boot disk is transparent to
the BIOS, drivers, and operating system. Host-based status software
monitors the state of the mirrored disks and reports any error conditions.
In
Figure 2.1
the system is configured with a second disk as a mirror of
the first (primary) disk.
Figure 2.1
Typical Mainboard Implementation
Figure 2.2
shows the logical view and physical view of the mirroring
configuration when there are two disks in the mirrored volume.
Two Disk Drives
OS
Mirrored
OS
NVSRAM
EEPROM
(For Configuration)
(For Write Journaling)
LSI Logic
Internal
Memory
External
Bus
SCSI
SCSI
Fusion-MPT
Controller