RAID Level 1

The disks within an array are divided into two equal sets. Data stored to the array is replicated (without compression) and stored on each set, resulting in two copies of your data at all times. Thus, if a disk should fail within either set, the storage system will continue transferring data normally - but using only the surviving disk(s). Thus, full data protection is provided by this RAID level since it always maintains a redundant copy of all data.

The down side is that only one half of the array’s raw capacity is available for use since the other half always holds a full copy of the data. This RAID level is sometimes referred to as ‘disk mirroring’.

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