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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 50 is a combination of RAID 5 (striping) and RAID 0 (mirroring). RAID 0 allows data to be striped and written to multiple drives simultaneously, and RAID 5 ensures data security by using parity bits evenly distributed on drives.

Troubleshooting Process

Figure A-30 shows how a RAID 50 array works. As shown in the figure, PA is the parity information of A0, A1, and A2; PB is the parity information of B0, B1, and B2; and so on.

As a combination of RAID 5 and RAID 0, a RAID 50 array consists of multiple RAID 5 spans, where data is stored and accessed in RAID 0 mode. With the redundancy function provided by RAID 5, RAID 50 ensures continued operation and rapid data restoration if a member drive in a span is faulty. In addition, the replacement of member drives does not affect services. RAID 50 tolerates a failed drive across multiple spans simultaneously, which cannot be implemented in RAID 5 alone. What is more, as data is distributed on multiple spans, RAID 50 provides high read/write performance.

Figure A-30 RAID 50 data processing
Updated: 2019-11-01

Document ID: EDOC1000004186

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