Computer Hardware User Manual

Chapter 2: Overview of Integrated RAID Mirrored Volumes | Operation of Mirrored Volumes SAS2 Integrated RAID Solution User Guide
Page 10 LSI Corporation Confidential
| August 2010
Figure 3: Integrated Mirroring Enhanced with Three Disks
You can configure an Integrated Mirroring + Striping volume with an even number of
disks, ranging from four minimum to ten maximum. The following figure shows the
logical view and physical view of an Integrated Mirroring + Striping volume with four
mirrored disks. The firmware writes each mirrored stripe to a disk and mirrors it to an
adjacent disk. RAID 10 is another term for this type of mirrored/striped configuration.
Figure 4: Integrated Mirroring + Striping with Four Disks
The LSI SAS2 BIOS configuration utility enables you to create mirrored volumes during
initial setup and to reconfigure them in response to hardware failures or changes in
the environment.
CAUTION: The SAS2 BIOS CU deletes all existing data from the disks drives when you
select them to use for a mirrored volume.
3_00008-00
Physical ViewLogical View
Mirrored Stripe 1
Mirrored Stripe 2
Mirrored Stripe 3
Mirrored Stripe 4
Mirrored Stripe N
Mirrored Stripe 1
Mirrored Stripe 2'
Mirrored Stripe 4
Mirrored Stripe 5'
Mirrored Stripe N-1'
+
Mirrored Stripe 1'
Mirrored Stripe 3
Mirrored Stripe 4'
Mirrored Stripe 6
Mirrored Stripe N
+
Mirrored Stripe 2
Mirrored Stripe 3'
Mirrored Stripe 5
Mirrored Stripe 6'
Mirrored Stripe N’
Physical ViewLogical View
Mirrored Stripe 1
Mirrored Stripe 2
Mirrored Stripe 3
Mirrored Stripe 4
Mirrored Stripe N
Mirrored Stripe 1
Mirrored Stripe 3
Mirrored Stripe 5
Mirrored Stripe 7
Mirrored Stripe N-1
+
Mirrored Stripe 1'
Mirrored Stripe 3'
Mirrored Stripe 5'
Mirrored Stripe 7'
Mirrored Stripe N-1'
+
Mirrored Stripe 2
Mirrored Stripe 4
Mirrored Stripe 6
Mirrored Stripe 8
Mirrored Stripe N
3_00009-00
+
Mirrored Stripe 2'
Mirrored Stripe 4'
Mirrored Stripe 6'
Mirrored Stripe 8'
Mirrored Stripe N’