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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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Initialization

Initialization

Virtual Drive Initialization

After creating a virtual drive (VD), you must initialize it so that it can be used by an operating system. After a VD with the redundancy function is initialized, the data relationships between the member drives of the VD meet the corresponding RAID level requirements. The LSI SAS3108 provides the following VD initialization modes:

  • Fast initialization: This is a foreground initialization mode. In fast initialization, the firmware writes zeros to the first 100 MB space of the virtual drive. The virtual drive changes to the Optimal state after initialization.
  • Slow initialization: This is a foreground initialization mode. To initialize a VD in this mode, the firmware needs to write zeros to the entire VD. During the initialization, the VD status is Optimal.
  • Background initialization: ensures that the number of member drives in a VD meets the requirements of the related RAID level.
    • For RAID 1 and RAID 10: When the data is inconsistent between master and slave member drives, data will be copied from the master drive to the slave drive during background initialization to overwrite the original data on the slave drive.
    • For RAID 5, RAID 6, RAID 50, and RAID 60: Background initialization reads data on all member drives and performs parity check. If the calculation result is inconsistent with the data on the parity drive, the newly generated data will overwrite the original data on the parity drive.

Generally, consistency checks and background initialization affect system performance.

Both consistency checks and background initialization implement a function similar to parity error correction. During a consistency check, the system records the areas with data inconsistency and can resolve the inconsistency, but background initialization does not provide this function. Besides, a consistency check can be started manually, but background initialization can only be started automatically.

Hard Drive Initialization

The two types of initialization are:

  • Drive initialization: Writes zeros to the first 100 MB.
  • Drive erasure: Writes zeros to the entire space.
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Updated: 2019-11-01

Document ID: EDOC1000004186

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