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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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Drive Mirroring

Drive Mirroring

Applicable to RAID 1 and RAID 10, drive mirroring is to write the same data simultaneously into two drives to achieve 100% data redundancy. Since the same data exists on two drives, data does not get lost even when one drive becomes faulty. Moreover, when one drive fails, the other drive can take over its services immediately.

Drive mirroring brings 100% redundancy. However, it is expensive because it requires a backup drive for each drive, as shown in Figure 3-2.

Figure 3-2 Drive mirroring example

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Updated: 2019-11-01

Document ID: EDOC1000004186

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