User's Manual

RAID Level 10 (Striping over mirror sets)
The RAB considers RAID Level 10 to be an implementation of RAID level 1. RAID 10 combines mirrored physical disks (RAID 1) with data striping (RAID 0). With
RAID 10, data is striped across multiple physical disks. The striped disk group is then mirrored onto another set of physical disks. RAID 10 can be considered a
mirror of stripes.
Figure 3-8. Striping Over Mirrored Disk Groups
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RAID 10 Characteristics:
l Groups n disks as one large virtual disk with a capacity of (n/2) disks, where n is an even integer.
l Mirror images of the data are striped across sets of physical disks. This level provides redundancy through mirroring.
l When a disk fails, the virtual disk still works. The data is read from the surviving mirrored disk.
l Improved read performance and write performance.
l Redundancy for protection of data.
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Related Information:
l Organizing Data Storage for Availability and Performance
l Comparing RAID Level and Concatenation Performance
l Controller-supported RAID Levels
l Number of Physical Disks per Virtual Disk
l Maximum Number of Virtual Disks per Controller
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RAID Level 1-Concatenated (Concatenated mirror)
RAID 1-concatenated is a RAID 1 disk group that spans across more than a single pair of physical disks. This combines the advantages of concatenation with
the redundancy of RAID 1. No striping is involved in this RAID type.
Figure 3-9. RAID 1-Concatenated
NOTE: On the PERC 4/SC, 4/DC, 4e/DC, 4/Di, 4e/Si, and 4e/Di controllers, there are special considerations when implementing RAID 10 on a disk group
that has disks of different sizes. For more information, see Considerations for RAID 10 and 50 on PERC 4/SC, 4/DC, 4e/DC, 4/Di, 4e/Si, and 4e/Di.
NOTE: You cannot create a RAID 1-concatenated virtual disk or reconfigure to RAID 1-concatenated with Storage Management. You can only monitor a
RAID 1-concatenated virtual disk with Storage Management.