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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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Compared with RAID 5, RAID 6 adds a second independent parity block. In RAID 6, two independent parity systems use different algorithms to ensure high reliability. Data processing is not affected even if two hard drives fail at the same time. However, RAID 6 requires larger drive space for storing parity information and has worse "write hole" effect compared with RAID 5. Therefore, RAID 6 provides lower write performance than RAID 5.

Troubleshooting Process

Figure A-27 shows how data is stored on a RAID 6 array consisting of five drives. PA and QA are the first and second parity blocks for data blocks A0, A1, and A2; PB and QB are the first and second parity blocks for data blocks B0, B1, and B2; and so on.

Data blocks and parity blocks are distributed to each RAID 6 member drive. If one or two member drives fail, the controller card restores or regenerates the lost data by using data on other normal member drives.

Figure A-27 RAID 6 data processing
Updated: 2019-11-01

Document ID: EDOC1000004186

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