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This topic describes the RAID 1E.
What is RAID 1E
RAID 1E is an enhanced version of RAID 1. It is a private RAID level proposed by IBM and has not become an international standard. It is not a combination of RAID 0+1. The working principle of RAID 1E is basically the same as that of RAID 1. The only difference is that RAID 1E has a stronger data recovery capability.
RAID 1E is also known as striped mirroring, enhanced mirroring, and hybrid mirroring.
RAID level 1E primarily combines drive mirroring and data striping capabilities within one level. The data is striped across all the drives within the array. It provides better drive redundancy and performance than RAID level 1.
RAID 1E requires a minimum of three drives to be constructed and can support up to 16 drives. RAID 1E only allows half of the capacity of the array to be used. If any of the drives fail, the read/write operations are transferred to other operational drives within the array.
Handling Process
The picture shows how data is processed on a RAID 1E array consisting of three physical hard drives. Strip data is distributed evenly to the three drives and all data has backup data in another drive. If a single drive fails, data is not lost.
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Related topic: Common RAID Level Comparison
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