Last updated：2021-06-15 11:14:46
Redundant Array of Independent Disks (RAID) is designed to improve read/write performance and fault tolerance. A RAID array offers faster transfer than a single disk, thus significantly increasing the data throughput of the storage system.
Redundant Array of Independent Disks (RAID) can improve I/O performance and fault tolerance. Compared with a single disk, RAID delivers high transmission rate and significantly increases data throughput of a storage system.
You can manage a RAID array in the way of managing independent disks or logical storage units. You can also set the RAID level when you purchase a GEPC instance or when you reinstall the system based on business demands.
|RAID level||Description||Required disks||Disk space utilization|
|Single-disk RAID 0||The earliest RAID mode, which employs data stripping to allow blocks of data from a file to be stored across all the disks. The data blocks on each disk are accessed independently and concurrently.
This RAID level provides the highest I/O performance, but it does not provide redundancy or fault tolerance. It applies to scenarios with low requirements on data security.
|RAID 1||Employs data mirroring which replicates data to at least two disks. RAID1 ensures system reliability and fault recovery capability without affecting the system performance.
When one disk fails, the system uses another disk. RAID 1 provides high data redundancy and is typically used to store mission-critical data.
|RAID 5||Combines parity with data striping. Blocks of data are stored across all the disks. RAID 5 does not provide data backup. Instead, RAID 5 writes data and the parity information to each disk. In case of a disk failure, RAID 5 uses the data and parity information on the remaining disks to restore the data.
RAID 5 provides high reliability because the parity information is stored across different disks. RAID 5 features high read performance and is suitable for scenarios where you have more reads and fewer writes.
|RAID 10||Combines data stripping of RAID 0 with data mirroring of RAID 1. RAID 10 offers a high read/write speed, implements mirroring-based data protection, and provides storage utilization of 50%. RAID 10 is the commonly used method.||n≥4||50%|
|RAID 50||Combines parity of RAID 5 with data striping of RAID 0. RAID 50 can provide high data security while ensuring storage I/O performance.||2n, n≥3||(n-2)/n%|
When you purchase a GEPC instance, you must set the Data Disk RAID parameter in the Select Image step. For more information, see Create an EPC instance.
When you reinstall the system for a GEPC instance, you can set the Data Disk RAID parameter. Note that this operation will format the disk. You must back up the data in advance.
For more information about system reinstallation, see Install an operating system.
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