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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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Virtual Drive Initialization

After you create a virtual drive (VD), initialize it for use with an OS. After a VD with the redundancy function is initialized, the data relationships between its member drives comply with their RAID level requirements. The three types of initialization are:

  • Fast initialization: In this foreground process, the firmware writes zeros to the first 100 MB of the VD, which changes to Optimal status once initialized.
  • Slow initialization: In this foreground process, the firmware writes zeros to the entire VD, during which the VD is in initialization status.
  • Background initialization:
    • For RAID 1 and RAID 10: When the data is inconsistent between master and slave member drives, data is copied from the master drive and overwrites the original data on the slave drive.
    • For RAID 5: Reads and checks parity of data on all member drives. If the result is inconsistent with the parity drive, the newly generated data will overwrite the original data on the parity drive.

Consistency checks and background initialization may affect system performance.

While consistency checks and background initialization both function as parity error correction, a consistency check also records and resolves data inconsistencies. It also can be started manually, while background initialization must be started automatically.

Hard Drive Initialization

Hard drive initialization is a process of formatting a hard drive by repeatedly writing zeros to it.

Updated: 2019-11-01

Document ID: EDOC1000004186

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