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RAID 1

RAID 1, also known as the data mirroring, provides 100% redundancy for data protection.

By balancing the load, read performance can be twice as that of a single drive; write performance is almost same as a single

drive. RAID 1 volumes are suitable for operating system volumes. A disadvantage is cost, as twice as many drives are required

for RAID 1.

The following are the key features of RAID 1:

● 100% duplication of data with instant failover.

● Requires two drives, preferably of the same capacity. When two different capacity drives are used, the volume size is same

as the capacity of the smaller drive. For example, if you use one 1 TB drive and one 2 TB drive in a RAID 1 array, the volume

size is 1 TB.

The following figure shows that if one 2 TB drive fails, data is lost. However, when there are two 2 TB drives in a RAID 1 volume,

data is still available even if one of the disks fails.

Introduction