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RAID 5 is a storage solution that combines storage performance, data security, and storage costs. RAID 5 can be understood as a compromise between RAID 0 and RAID 1. RAID 5 can provide data security for the system, but the degree of protection is lower than that of Mirror and the utilization of disk space is higher than Mirror. RAID 5 has a data read speed similar to that of RAID 0, but with one more parity information, and writing data is slightly slower than writing to a single disk. At the same time, because multiple data correspond to a parity information, the disk space utilization of RAID 5 is higher than that of RAID 1, and the storage cost is relatively low.

RAID5E is a high level of RAID disk storage. RAID5E (RAID5 Enhancement) is an improvement based on the RAID5 level. Similar to RAID5, the check information of the data is evenly distributed on each hard disk, but a part of unused space is reserved on each hard disk. This part of the space is not striped, allowing up to two physical hard drives to fail. It seems that RAID 5e and RAID5 plus a hot spare are similar, but because RAID 5e distributes data on all hard drives, its performance will be better than that of RAID5 plus a hot spare. When a hard disk fails, the data on the failed hard disk will be compressed to unused space on other hard drives, and the logical disk remains at the RAID 5 level.

RAID 5EE provides a perfect alternative to the "RAID5+HotSpare" disk. The original single HotSpare hot spare was also striped by Stripe and evenly distributed among 5 disks. In this way, when reading and writing to RAID 5EE, five disks participate in Icano at the same time, which increases the read and write bandwidth of one disk and improves the performance compared with the case of four disks + HotSpare disks. RAID 5EE's data distribution is more efficient, and a portion of the space on each hard disk is used as a distributed hot spare, which is part of the array, and data is rebuilt faster when a physical hard disk in the array fails. RAID5EE can work when two disks in the disk array are dropped at the same time, while RAID5 can only work when at most one disk is offline.

Generally speaking, raid5e,raid5ee has added parallel read and write function of disk on the basis of raid5, and raid5ee supports two disks to continue to work offline, which is more stable than raid5.

The data recovery principle of riad5,raid5e,raid5ee is based on parity. The specific process can be referred to: RAID5 definition, data recovery principle and its application.

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