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RAID 6E is a type of RAID 6 configuration with an integrated hot spare drive in which the spare drive is active in the block rotation scheme.
The E in RAID 6E stands for "extended" as it adds on or extends the capabilities of standard RAID 6. It is part of the overall RAID operations and can be used for input/output operations.
The addition of a hot spare drive enables increased performance and reliability by replacing a failed drive.. In the beginning, spare drive could only be used per array, not with other RAID arrays. However, more recent advances in SAN architecture and controller design have made it possible for several arrays to share hot spares.