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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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Huawei uses machine translation combined with human proofreading to translate this document to different languages in order to help you better understand the content of this document. Note: Even the most advanced machine translation cannot match the quality of professional translators. Huawei shall not bear any responsibility for translation accuracy and it is recommended that you refer to the English document (a link for which has been provided).
Creating a Disk Domain

Creating a Disk Domain

This section describes how to create a disk domain.

Context

A storage system provides hot spare space to take over data from failed member disks. The following hot spare policies are supported:

  • High

    The capacity of one disk is used as hot spare space if the number of disks in a storage system is less than or equal to 12. The hot spare space increases non-linearly with the number of disks.

  • Low

    The capacity of one disk is used as hot spare space if the number of disks in a storage system is less than or equal to 25. The hot spare space increases non-linearly with the number of disks.

  • None

    The storage system does not provide any hot spare space. In the event a member disk in a disk domain fails, the storage system uses the free capacity in the disk domain for reconstruction. If the free capacity in the disk domain is insufficient, the storage system uses the unused capacity in the storage pool for reconstruction. If reconstruction fails, the disk domain will change to the Degrade state, which will cause the read/write performance to deteriorate, affecting the storage system reliability.

Table 4-4 describes how hot spare space of each pair of controllers changes with the number of disks in V300R002C00.

Table 4-4 Changes of hot spare space

Number of Disks

Number of Disks Whose Capacity Is Used as Hot Spare Space in a High Hot Spare Policya

Number of Disks Whose Capacity Is Used as Hot Spare Space in a Low Hot Spare Policya

[8, 12]

1

1

(12, 25]

2

(25, 50]

3

2

(50, 75]

4

(75, 125]

5

3

(125, 175]

6

(175, 275]

7

4

(275, 300]

8

4

a: Storage systems use RAID 2.0+ virtualization technology. Hot spare capacity is provided by all member disks in each disk domain. Therefore, the hot spare capacity is expressed in number of disks in this table.

For example, if a disk domain is composed of 12 SSDs and the high hot spare policy is used, the hot spare space is equal to the capacity of one SSD and the capacity is provided by all member disks in the disk domain. If a disk domain is composed of 13 SSDs and the high hot spare policy is used, the hot spare space is equal to the capacity of two SSDs.

NOTE:
  • When you are creating a disk domain, ensure that the disks used to provide hot spare space are sufficient.
  • Hot spare space can be used to rebuild data of failed disks only within the disk domain where the hot spare space resides.
  • Table 4-4 lists common capacity changes of hot spare space. The number of disks supported by a storage system and the capacity of their hot spare space depend on actual specifications.

Table 4-5 describes how hot spare space of each pair of controllers changes with the number of disks in V300R002C10 or later.

Table 4-5 Changes of hot spare space

Number of Disks

Number of Disks Whose Capacity Is Used as Hot Spare Space in a High Hot Spare Policya

Number of Disks Whose Capacity Is Used as Hot Spare Space in a Low Hot Spare Policya

[8, 12]

1

1

(12, 25]

2

(25, 75]

3

2

(75, 300]

3

a: Storage systems use RAID 2.0+ virtualization technology. Hot spare capacity is provided by all member disks in each disk domain. Therefore, the hot spare capacity is expressed in number of disks in this table.

For example, if a disk domain is composed of 12 SSDs and the high hot spare policy is used, the hot spare space is equal to the capacity of one SSD and the capacity is provided by all member disks in the disk domain. If a disk domain is composed of 13 SSDs and the high hot spare policy is used, the hot spare space is equal to the capacity of two SSDs.

NOTE:
  • When you are creating a disk domain, ensure that the disks used to provide hot spare space are sufficient.
  • Hot spare space can be used to rebuild data of failed disks only within the disk domain where the hot spare space resides.
  • Table 4-5 lists common capacity changes of hot spare space. The number of disks supported by a storage system and the capacity of their hot spare space depend on actual specifications.
  • If a storage system is upgraded to V300R002C10 or later, the hot spare space of the disk domains created before the upgrade is calculated in accordance with the rules in the source version. Similarly, the hot spare space of disk domains created after the upgrade is calculated in accordance with the rules in the target version.

Precautions

You must configure the key service before using self-encrypting disks to create a self-encrypting disk domain. For details, see the Disk Encryption User Guide corresponding to your product model and version.

Procedure

  1. Choose Provisioning > Disk Domain.
  2. Click Create.

    The Create Disk Domain dialog box is displayed.

    NOTE:

    GUIs may vary with product versions and models. The actual GUIs prevail.

  3. Name and describe the disk domain.

    1. In Name, enter a name for the disk domain.
      NOTE:
      • The name must be unique.
      • The name can contain only letters, digits, periods (.), underscores (_), and hyphens (-).
      • The name must contain 1 to 31 characters.
    2. In Description, enter the function and properties of the disk domain. The descriptive information helps identify the disk domain.

  4. In Encryption Type, select a disk domain type.

    The following disk domain types are available:

    • Standard disk domain: create an unencrypted disk domain.
    • Self-encrypting disk domain: create an encrypted disk domain. All disks in the selected controller enclosure must be self-encrypting disks.
    NOTE:

    If Self-encrypting disk domain is selected, the system will automatically check whether the key service is configured. If the key service is not configured, the system will prompt you to configure it first. Some device models do not support Self-Encrypting Disk, For details about device models that support this feature, see Product Description published in the support website or consult the product provider.

  5. In Select controller enclosures, select a controller enclosure to create a disk domain.

    1. Set Controller Enclosure (Controller):
      • You can click to add an option for Controller Enclosure (Controller). A maximum of two options can be selected.
      • You can click to remove an option for Controller Enclosure (Controller). At least one option must be selected.
      NOTE:

      If a disk domain is created on controllers that already have a disk domain, the type (disks owned by two or four controllers) of the new disk domain must be the same as that of the existing disk domain.

    2. Set Disk Type and Quantity.
      1. Select the required disk types.
        NOTE:
        • You can select only one disk type for each disk domain.
        • You can select two disk capacity specifications for each disk domain.
        • If Encryption Type of a disk domain is set to Standard disk domain, you can select an ordinary disk or a self-encrypting disk. If Encryption Type of a disk domain is set to Self-encrypting disk domain, you can only select a self-encrypting disk.
      2. Set Required Disks.
        NOTE:
        • When you set one value in Controller Enclosure (Controller), the number of required disks must be 8 or more.
        • When you set two values in Controller Enclosure (Controller), the number of required disks must be 16 or more and the entered number must be an even number.

  6. In the Hot Spare Policy area, configure the hot spare policy for the disk domain to be created.
  7. Click OK.

    The Execution Result dialog box is displayed, indicating that the operation succeeded.

    NOTE:

    You can click Create Storage Pool to go to the page for creating a storage pool.

  8. Click Close.

    NOTE:
    • You can click to set the information items to be displayed.
    • To view basic information about disks in a disk domain, select the disk domain and click the Disk tab in the information display area below.

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Updated: 2019-07-17

Document ID: EDOC1100049139

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