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Basic Storage Service Configuration Guide for Block

OceanStor Dorado V3 Series V300R002

This document is applicable to OceanStor Dorado3000 V3, Dorado5000 V3, Dorado6000 V3, and Dorado18000 V3. It describes the basic storage services and explains how to configure and manage them.
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Planning the Available Capacity

Planning the Available Capacity

The available capacity of storage systems must be properly planned to ensure sufficient capacity for service data.

For details about the available capacity and purchased capacity, contact your local Huawei representative office or Huawei authorized distributor.

When planning the available capacity, you must consider the nominal disk capacity, hot spare capacity, coffer disk capacity, and RAID level.

  • Nominal disk capacity

    The disk capacity defined by disk manufacturers is different from that calculated by operating systems. As a result, the nominal capacity of a disk is different from that displayed in the operating system.

    • Disk capacity defined by disk manufactures: 1 GB = 1,000 MB, 1 MB = 1,000 KB, 1 KB = 1,000 bytes
    • Disk capacity calculated by operating systems: 1 GB = 1,024 MB, 1 MB = 1,024 KB, 1 KB = 1,024 bytes
  • Capacity used by coffer disks

    The first four disks in the first disk enclosure are configured as coffer disks. If a controller enclosure has integrated disks, the first four disks on the controller enclosure are configured as coffer disks. Part of the coffer disks' capacity is used to save important system data, including configuration data and system logs. The rest of their capacity is used to store service data.

  • Hot spare capacity

    The storage system provides hot spare space to take over data from any failed disk.

  • RAID

    The capacity used by parity data varies with the RAID level.

The evaluation results of the local Huawei representative office or Huawei authorized distributor supersede the considerations in this section.

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Updated: 2019-07-17

Document ID: EDOC1100049139

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