Frequently Asked Questions

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With all of the virtues of RAID 5 and RAID 6 storage systems, when would one ever employ RAID 1?


There are several situations where a RAID 1 configuration is very appropriate. When there are only two drives in a storage system, RAID 1 (also know as disk mirroring) is the only RAID level that can provide data protection if a drive fails. And, since a RAID 1 configuration can be constructed with just two drives, it generally offers the least expensive way to protect one’s data from a drive failure. Though RAID 1 configurations are the least efficient with total storage capacity (reserving 50% of the total capacity for data protection), it can sometimes offer greater performance than either RAID 5 or RAID 6 configurations. This is frequently true after a RAID 5 or 6 system is degraded by a drive failure.

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