Asus LSI SAS3442X-R - Manual (Page 21)

Integrated RAID Firmware 2-5
Version 1.1 Copyright © 2006, 2007 by LSI Logic Corporation. All rights reserved.
Figure 2.3 Integrated Mirroring Enhanced with Three Disks
The LSI BIOS-based configuration utility enables you to create IM and
IME volumes during initial setup and to reconfigure them in response to
hardware failures or changes in the environment.
2.4 Integrated RAID Firmware
This section describes features of the LSI Integrated RAID firmware.
2.4.1 Resynchronization with Concurrent Host I/O Operation
The Integrated RAID firmware allows host I/Os to continue on an IM or
IME volume while the volume is being re-synchronized in the
background. Resynchronization is attempted after a hot spare is
activated due to a physical device failure, or after a hot swap has
occurred to a physical disk in the volume.
2.4.2 Metadata Support
The firmware supports metadata, which describes the IM/IME logical
drive configuration stored on each member disk. When the firmware is
initialized, each member disk is queried to read the stored metadata in
Mirrored Stripe 1
Mirrored Stripe 2
Mirrored Stripe 3
Mirrored Stripe n
+
+
Logical View Physical View
Mirrored Stripe 1
Mirrored Stripe 3’
Mirrored Stripe 4
Mirrored Stripe n-2
Mirrored Stripe 6’
Mirrored Stripe n’
Mirrored Stripe 2
Mirrored Stripe 1’
Mirrored Stripe 5
Mirrored Stripe n-1
Mirrored Stripe 4’
Mirrored Stripe (n-2)’
Mirrored Stripe 3
Mirrored Stripe 2’
Mirrored Stripe 6
Mirrored Stripe n
Mirrored Stripe 5’
Mirrored Stripe (n-1)’
Mirrored Stripe 6
Mirrored Stripe 5
Mirrored Stripe 4