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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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Fault Tolerance

Fault Tolerance

Fault tolerance is the capability to ensure data integrity and data processing performance when a drive error or fault occurs in a subsystem. The RAID controller card uses redundant drive arrays to implement fault tolerance for RAID 1, 5, 6, 10, 50, and 60.

In RAID 1, data images are stored on a pair of drives, and errors or faults on one of the drives do not cause data loss. Employing the same working principle, RAID 5 allows one faulty drive, and RAID 6 allows two faulty drives.

Consisting of multiple spans, RAID 10 and RAID 50 allow the number of faulty drives to be the same as the number of spans but require each span to contain only one faulty drive. RAID 60 allows the number of faulty drives to be twice that of spans and requires each span to contain a maximum of two faulty drives.

RAID 0 does not support fault tolerance. When a drive in RAID 0 becomes faulty, the RAID array fails and data gets lost.

The fault tolerance feature improves the system availability. When a drive becomes faulty, the system can still work properly. Fault tolerance is of great importance for fault recovering.

Updated: 2019-11-01

Document ID: EDOC1000004186

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