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Understanding RAID Concepts 41
Figure 3-3. Mirroring Disks
RAID 1 Characteristics:
• Groups
n
+
n
disks as one virtual disk with the capacity of
n
disks. The
controllers currently supported by Storage Management allow the
selection of two disks when creating a RAID 1. Because these disks are
mirrored, the total storage capacity is equal to one disk.
• Data is replicated on the two disks.
• When a disk fails, the virtual disk still works. The data is read from the
failed disk’s mirror.
• Better read performance, but slightly slower write performance.
• Redundancy for protection of data.
• RAID 1 is more expensive in terms of disk space since twice the number of
disks are used than required to store the data without redundancy.