Performance Comparison of raid5 5e 5ee and data recovery principles

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 it is more secure than Mirror, and the disk space utilization is higher than Mirror. RAID 5 has a Data Reading Speed similar to RAID 0, but has an additional parity information. The data writing speed is slightly slower than that of a single disk. At the same time, because multiple data correspond to one parity information, the disk space utilization of RAID 5 is higher than that of RAID 1, and the storage cost is relatively low.

RAID 5E is a high level in RAID disk storage. RAID 5E (RAID 5 Enhancement) is an improvement based on RAID 5, similar to RAID 5, data validation information is evenly distributed on each hard disk, but some unused space is retained on each hard disk, A maximum of two physical hard disks can be faulty. It seems that RAID 5E is similar to RAID 5's hot spare disk. In fact, RAID 5E distributes data across all hard disks, and the performance will be better than RAID 5's hot spare disk. When a hard disk fails, the data on the faulty hard disk is compressed to space not used on other hard disks, and the logical disk is RAID 5.

RAID 5EE provides a complete solution to replace the "RAID 5 + HotSpare" disk. The original HotSpare hot backup disk is also strip and allocated to five magnetic disks on average. In this way, when reading and writing RAID 5EE, five disks participate in I/O at the same time. Compared with four disks and HotSpare disks, the read/write bandwidth of one disk is exceeded, improved performance. RAID 5EE data distribution is more efficient. A portion of each hard disk space is used as a distributed hot backup disk, which is part of the array. When a physical hard disk in the array fails, data Reconstruction is faster. RAID5EE can work normally when two disks in the disk array are offline at the same time, while RAID5 can only work when one disk is offline at most.

In general, raid5e and raid5ee are added based on raid5. The parallel read/write function of the disk is also added. In addition, raid5ee supports the disconnection of two disks, which is more stable than RAID 5.

The data recovery principles of riad5, raid5e, and raid5ee are restored Based on the parity check. For details, refer to RAID5 definition, data recovery principles, and application.

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