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Huawei V2 and V3 Server RAID Controller Card User Guide 36

This document describes the appearances and features of the redundant array of independent disks (RAID) controller cards, how to configure properties for the RAID controller cards, and how to install drivers. The RAID controller cards include the LSI SAS2208, LSI SAS2308, LSI SAS3008, LSI SAS3108, LSI SoftRAID, PM8060, and PM8068.
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I/O Performance

I/O Performance

A RAID array can be used as an independent storage unit or multiple virtual units. The I/O read/write speed for a RAID array is higher than that for a common drive because a RAID array allows concurrent access to multiple drives.

RAID 0: Provides excellent performance. In RAID 0, data is divided into smaller data blocks and written into different drives. RAID 0 improves I/O performance because it allows concurrent read and write of multiple drives.

RAID 1: Hard drives in a RAID array exist in pairs. When data is written, the data is written into the two hard drives in the same RAID array. This method requires more time and resources, affecting performance.

RAID 5: Provides relatively high data throughput capabilities. Each member drive stores both common data and check data concurrently. Therefore, each member drive can be read or written separately. In addition, RAID 5 adopts a comprehensive cache algorithm. All these features make RAID 5 ideal for many scenarios.

RAID 6: RAID 6 is ideal for scenarios that demand high reliability, response rate, and transmission rate. It provides high data throughput, redundancy, and I/O performance. However, RAID 6 requires two sets of check data to be written into each member drive, leading to low performance during write operations.

RAID 10: The RAID 0 spans of RAID 10 provide high data transmission rates. In addition, RAID 10 provides excellent data storage capabilities. The I/O performance of RAID 10 improves as the number of its spans increases.

RAID 50: RAID 50 delivers the best performance in scenarios that require high reliability, response rate, and transmission rate. The I/O performance of RAID 50 improves as the number of its spans increases.

RAID 60: The suited application scenarios of RAID 60 are similar to those of RAID 50. However, RAID 60 is not suited for large-volume write tasks because it requires two sets of parity check data to be written into each member drive, which affects performance during write operations.

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Updated: 2019-11-01

Document ID: EDOC1000004186

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