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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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Hot Spares

Hot Spares

The controller card supports two types of hot spares: hot spare and emergency spare.

Hot Spare Drives

After RAID configuration of the hard drives of a server, configuration of hot spare drives increases security and reduces impact on services from hard drive faults. The controller card supports two types of hot spare drives:

  • Global hot spare drive: shared by all RAID arrays of a controller, which can be configured with one or more global hot spare drives. A global hot spare drive automatically replaces a failed hard drive of the same type as the hot spare drive in any RAID array.

    For details, see Configuring a Global Hot Spare Drive.

  • Dedicated hot spare drive: replaces a failed hard drive of the same type as the hot spare drive only in a specified RAID array, which can be configured with one or more dedicated hot spare drives.

    For details, see Configuring a Dedicated Hot Spare Drive.

A hot spare drive must have at least the capacity of a member drive.

  • The HDDs and SSDs cannot be used as the hot spare drives of each other.
  • The HDDs include SAS HDDs and SATA HDDS. If the member drives of a RAID array are SAS drives, the SATA drives can be used as dedicated hot spare drives. If the member drives are SATA drives, the SAS drives cannot be used as dedicated hot spare drives.

Emergency Spares

If no hot spare drive is specified for a RAID array with redundancy, emergency spare allows a drive in the Unconfigured Good state to automatically replace a failed or prefail member drive to rebuild data to avoid data loss. Note that the drive must be of the same type as the member drive to be replaced.

The capacity of the idle drive used to rebuild data must be greater than or equal to that of a member drive.

Emergency spare involves two scenarios:

  • A drive in the Unconfigured Good state replaces a failed member drive.
  • A drive in the Unconfigured Good state replaces a member drive in the prefail state.
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Updated: 2019-11-01

Document ID: EDOC1000004186

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