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

Hot Spare Drives

A hot spare drive is an independent drive in a drive system. It automatically replaces a failed drive in a RAID array to implement fault tolerance.

On RAID controller card management screens or command-line interface (CLI), you can specify an idle drive as the hot spare drive of the RAID array. The idle drive must have at least the capacity of the member drive and is of the same medium type as that of the member drive.

The RAID controller card supports two types of hot spare drives:

  • Global hot spare drive: shared by all RAID arrays of a RAID controller card, which can be configured with one or more global hot spare drives. A global hot spare drive automatically replaces a faulty hard drive in any RAID array.
  • Dedicated hot spare drive: replaces a failed drive only in a specified RAID array, which can be configured with one or more dedicated hot spare drives. The dedicated hot spare drive automatically takes over services of a faulty member drive in the specified RAID array.

Hot spare drives feature the following:

  • They are applicable only to RAID arrays with redundancy, for example, RAID 1, 5, 6, 10, 50, and 60.
  • They can replace only failed drives that are managed by the same RAID controller card as themselves.

Emergency Spare

If no hot spare drive is specified for a RAID array with redundancy, emergency spare allows an idle drive managed by the RAID controller card to automatically replace a failed member drive and rebuild data to avoid data loss.

The idle drive used for emergency spare must be of the same medium type as that of the failed member drive and have at least the capacity of the failed member drive.

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Updated: 2019-11-01

Document ID: EDOC1000004186

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