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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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RAID 1

RAID 1

RAID 1 is also referred to as mirroring. In a RAID 1 array, each operating drive has a mirrored drive. Data is written to and read from both operating and mirrored drives simultaneously. After a failed drive is replaced, data can be rebuilt from the mirrored drive. RAID 1 provides high reliability, but only half of the total capacity is available. It applies to scenarios where high fault tolerance is required, such as finance.

Troubleshooting Process

Figure A-25 shows how data is processed on a RAID 1 array consisting of two physical hard drives.

  • When writing data into drive 0, the system also automatically copies the data to drive 1.
  • When reading data, the system obtains data from drive 0 and drive 1 simultaneously.
Figure A-25 RAID 1 data processing
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Updated: 2019-11-01

Document ID: EDOC1000004186

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