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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 5 is a storage solution that balances storage performance, data security, and storage costs. To ensure data reliability, RAID 5 uses the distributed redundancy check mode and distributes parity data to every member drive. If a drive in a RAID 5 array is faulty, data on the failed drive can be rebuilt from the data on other member drives in the array. RAID 5 can be used to process a large or small amount of data. It features high speed, large capacity, and fault tolerance distribution.

Troubleshooting Process

Figure A-26 shows how a RAID 5 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.

RAID 5 does not back up the data stored. Instead, data and its parity information are stored on different member drives in the array. If data on a member drive is damaged, the data can be restored from the remaining data and its parity information. If data on a RAID 5 member drive is damaged, RAID 5 can use the remaining data and the corresponding parity information to restore the damaged data.

RAID 5 can be considered as a compromise between RAID 0 and RAID 1.

  • RAID 5 provides lower data security level than RAID 1. However, it offers higher drive space utilization and lower storage costs because multiple data records share the same parity information.
  • RAID 5 provides slightly lower data read/write speed than RAID 0. However, its read performance is higher than the single-drive write performance.
Figure A-26 RAID 5 data processing
Updated: 2019-11-01

Document ID: EDOC1000004186

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