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Dell PowerEdge RAID Controller 9 User’s Guide H330, H730, and H830

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Disk mirroring

With mirroring (used in RAID 1), data written to one disk is simultaneously written to another disk. If one disk fails, the contents of the other disk can be used to run the system and rebuild the failed physical disk. The primary advantage of disk mirroring is that it provides complete data redundancy. Both disks contain the same data at all times. Either of the physical disks can act as the operational physical disk.

Disk mirroring provides complete redundancy, but is an expensive option because each physical disk in the system must be duplicated.

NOTE:Mirrored physical disks improve read performance by read load balance.
Figure 1. Example of Disk Mirroring (RAID 1)
The figure shows an example of disk mirroring.

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