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Basic Storage Service Guide for File 15

OceanStor 5300 V3, 5500 V3, 5600 V3, 5800 V3, and 6800 V3 Storage System V300R003

"This document describes the basic storage services and explains how to configure and managebasic storage services."
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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

The types of disks in a disk domain decide which storage tiers can be created. The first step for creating a storage pool is to create a disk domain and specify the types and number of member disks.

Context

When creating a disk domain, you can select self-encrypting disks to encrypt the disk domain.

A disk domain consists of the same storage media or different storage media of disks. Disks of the same storage media form a storage tier. The system supports the following storage tiers:
  • The high performance tier, providing the highest performance, consists of SSDs. As the SSD storage media have a high cost and low capacity, this tier is suitable for storing frequently accessed data.
  • The performance tier, providing modest performance, consists of SAS disks. As SAS storage media have a modest cost and large capacity, this tier is suitable for storing data with a modest access frequency.
  • The capacity tier, providing the lowest performance, consists of NL-SAS disks. As NL-SAS storage media have the lowest cost and largest capacity, the capacity tier is suitable for storing a large amount of data with a low access frequency.
To prevent data loss or performance deterioration caused by a member disk failure, the storage system employs hot spare space to take over data from the failed member disk.
  • If the product version is V300R003C00, the following hot spare policies are supported:
    • High

      The capacity of one disk is used as hot spare space if the number of disks at a storage tier equals to or fewer than 12. The hot spare space non-linearly increases as the number of disks increases. When the number of disks at a storage tier reaches 168, the storage tier uses the capacity of one disk in every 96 disks as the hot spare space.

    • Low

      The capacity of one disk is used as hot spare space if the number of disks at a storage tier equals to or fewer than 24. The hot spare space non-linearly increases as the number of disks increases. When the number of disks at a storage tier reaches 168, the storage tier uses the capacity of one disk in every 192 disks as the hot spare space.

    • None

      The system does not provide hot spare space.

    Table 3-2 describes how hot spare space changes with the number of disks. The hot spare space changes at a storage tier are used as an example here. The hot spare space changes at different types of storage tiers are the same.
    Table 3-2  Changes of hot spare space

    Number of Disks

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

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

    (1, 12]

    1

    1

    (12, 24]

    2

    (24, 48]

    3

    2

    (48, 72]

    4

    (72, 120]

    5

    3

    (120, 168]

    6

    (168, 264]

    7

    4

    (264, 360]

    8

    a: Huawei storage systems use RAID 2.0+ virtualization technology. Hot spare capacity is provided by 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 occupies the capacity of one SSD and the capacity is provided by 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 occupies 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 for the current disk domain only.
    • Table 3-2 lists common capacity changes of the hot spare space. The number of disks supported by a storage system and the capacity of their hot spare space are based on actual specifications.
  • If the product version is V300R003C10 or V300R003C20, the following hot spare policies are supported:
    • High

      The capacity of one disk is used as hot spare space if the number of disks at a storage tier equals to or fewer than 12. The hot spare space non-linearly increases as the number of disks increases. When the number of disks at a storage tier reaches 175, the storage tier uses the capacity of one disk in every 100 disks as the hot spare space.

    • Low

      The capacity of one disk is used as hot spare space if the number of disks at a storage tier equals to or fewer than 25. The hot spare space non-linearly increases as the number of disks increases. When the number of disks at a storage tier reaches 175, the storage tier uses the capacity of one disk in every 200 disks as the hot spare space.

    • None

      The system does not provide hot spare space.

    Table 3-3 describes how hot spare space changes with the number of disks. The hot spare space changes at a storage tier are used as an example here. The hot spare space changes at different types of storage tiers are the same.
    Table 3-3  Changes of hot spare space

    Number of Disks

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

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

    (1, 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, 375]

    8

    a: Huawei storage systems use RAID 2.0+ virtualization technology. Hot spare capacity is provided by 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 occupies the capacity of one SSD and the capacity is provided by 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 occupies 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 for the current disk domain only.
    • Table 3-3 lists common capacity changes of the hot spare space. The number of disks supported by a storage system and the capacity of their hot spare space are based on actual specifications.

Procedure

  1. Log in to DeviceManager.
  2. Choose Provisioning > Disk Domain.
  3. Click Create.

    The Create Disk Domain dialog box is displayed.

  4. 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 value contains 1 to 31 characters.

    2. In Description, enter the function and properties of the disk domain. The descriptive information helps identify the disk domain.
  5. In Encryption Type, select a type to determine whether the disk domain is created by using self-encrypting disks.

    Encryption types include:

    • Non-Encrypting Disk: create a unencrypted disk domain.
    • Self-Encrypting Disk: create an encrypted disk domain.
    NOTE:
    • Self-Encrypting Disk: When data is written into or read from a disk, the data is encrypted or decrypted using the hardware circuit and internal encryption key of the disk. The self-encrypting disk is a special type of disk.

      Before using an encrypted disk, you must configure a server (encryption key management server) to manage the encryption key of the encrypted disk and set the information about the certificate used for encryption.

    • None-Encrypting Disk: Non-encrypting disks are common disks that do not support the encryption function.
    • Self-encrypting and non-encrypting disks cannot exist in the same disk domain.

  6. Select the disks that comprise the disk domain. There are three ways to select the disks:
    • Select All available disks.

      You only need to configure the hot spare policy for storage tier.

      NOTE:

      It is recommended that you create a disk domain by Manually select disks, ensure that all disks are from the same engine, so that disk domain on one engine reduces the disk failure probability and improve the read and write performance of disks.

    • Select Specify disk type.
      1. Select the storage tier according to the storage media of disks.
      2. Configure the number of disks for each storage tier.
      3. Configure the hot spare policy for each storage tier.
    • Select Manually select.
      1. Click Select.
      2. In Select Disk dialog box, select the disks you need and click .
      3. Click OK to finish selecting disks.
      4. Configure the hot spare policy for each storage tier.

    NOTE:

    If you plan to create a RAID 10 storage pool in the disk domain that you are creating, you are advised to manually select an even number of disks owned by each engine for each storage tier in the disk domain to ensure the reliability of RAID 10.

    Storage system provides hot spare space by configuring hot space policy, so that the hot spare space can take over data from failed member disks.

    You are advised to configure a maximum of 100 disks for each tier in a disk domain. For example, if the number of disks on a tier is D (divide D by 100 and then round off the result to N and the remainder is M), you can refer to the following configurations:
    • If D ≤ 100, configure all disks on this tier in one disk domain.
    • If D > 100, create N+1 disk domains and evenly distribute all disks to the N+1 disk domains. That is, the number of disks in each disk domain is D/(N+1). In addition, it is recommended that disk enclosures be fully configured.
    • For SmartTier, it is recommended that a maximum of 100 disks be configured for each tier in a disk domain. The configuration of disks on each tier is the same as the preceding principle.

    Example 1: The total number of SSDs in the storage system is 328, which is the value of D. (Divide 328 by 100. Round off the result to 3, which is the value of N. The remainder is 28, which is the value of M). You are advised to configure four disk domains, each of which contains 328/4 = 82 SSDs.

    Example 2: If the total number of SSDs in the storage system is 223, which is the value of D. (Divide 223 by 100. Round off the result to 2, which is the value of N. The remainder is 23, which is the value of M). You are advised to configure three disk domains, each of which contains 223/3 = 74.3 disks. In this case, two disk domains are configured with 74 disks respectively and the other disk domain is configured with 75 disks.

    Example 3: If a disk domain consists of SSDs, SAS disks, and NL-SAS disks, for SmartTier, the number of disks of each type cannot exceed 100.

    If the project requires a disk domain containing over 100 disks to meet capacity and service planning requirements, contact Huawei technical engineers to evaluate.

  7. Click OK.

    A message is displayed, indicating that the operation succeeded.

  8. Click OK. The disk domain has been created. To view basic information about disks in the current disk domain, choose Provisioning > Disk Domain . The disk information is displayed in the information display area. To view the engine to which a disk belongs, click.

Follow-up Procedure

After a disk domain is created, you are advised to configure host services after the disk domain is formatted. Method for viewing the progress of disk formatting:

After a disk domain is created, choose Provisioning > Disk Domain. In the function pane, click the disk domain that you have created. Click Properties and view the disk formatting progress in Progress.

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Updated: 2019-02-01

Document ID: EDOC1000084198

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