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OceanStor 2600 V3 Video Surveillance Edition V300R006 Basic Storage Service Configuration Guide for File

This document is applicable to OceanStor OceanStor 2600 V3 Video Surveillance Edition. This document describes the basic storage services and explains how to configure and manage basic storage services for storage system.
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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).
Planning Disk Domains

Planning Disk Domains

A disk domain provides storage space for storage pools. The available capacities of storage pools depend on the capacity and hot spare policy of the disk domain.

Planning Capacity for a Disk Domain

The space of a storage pool originates from a disk domain. Therefore, the capacity of the disk domain determines the available capacity of the storage pool. The capacity of the disk domain must be properly planned to ensure full utilization of storage space.

Planning Hot Spare Policies for a Disk Domain

To prevent data loss or performance deterioration caused by a member disk failure, a storage system uses hot spare space to take over data from the failed member disk. 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 is equal to or fewer than 12. The hot spare space non-linearly increases as the number of disks increases.

  • Low

    The capacity of one disk is used as hot spare space if the number of disks at a storage tier is equal to or fewer than 25. The hot spare space non-linearly increases as the number of disks increases.

    Number of disks of which capacity is used as hot spare space in a low hot spare policy = Number of disks of which capacity is used as hot spare space in a high hot spare policy/2 (rounded up)

  • 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 unallocated capacity in storage pools 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 2-4 describes how hot spare space changes for a single engine with the number of disks in V300R006C50 and earlier. The hot spare space changes at a storage tier are used as an example here. The hot spare space changes at different storage tiers are the same.

Table 2-4 Changes of hot spare space for a single engine

Number of Disks

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

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

(1, 12]

1

1

(12, 25]

2

(25, 50]

3

2

(50, 75]

4

(75, 125]

5

3

(125, 175]b

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 the 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.

b: When the number of disks at a storage tier reaches 175, the storage tier uses the capacity of one disk in every 100 additional disks as the hot spare space in a high hot spare policy.

Table 2-5 describes how hot spare space changes for a single engine with the number of disks in V300R006C60 and later. The hot spare space changes at a storage tier are used as an example here. The hot spare space changes at different storage tiers are the same.

Table 2-5 Changes of hot spare space for a single engine

Number of Disks

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

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

(1, 12]

1

1

(12, 25]

2

(25, 125]b

3

2

(125, 325]

4

……

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 the 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.

b: When the number of disks at a storage tier reaches 125, the storage tier uses the capacity of one disk in every 200 additional disks as the hot spare space in a high hot spare policy.

NOTE:
  • After a storage system is upgraded to V300R006C60 or later, hot spare space in the disk domains created before the upgrade will be re-calculated according to the rules in Table 2-5.
  • Number of Disks in the above tables refers to the number of same-type disks owned by a same engine. If you select disks from multiple engines to create a disk domain, calculate the number of disks used for hot spare space on each engine and sum up the values.
  • 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 a specific disk domain only.
  • Common capacity changes of the hot spare space are listed in this section. The number of disks supported by a storage system and the capacity of hot spare space are based on actual specifications.
  • You are advised to use disks of the same type, capacity and rotating speed at the same storage tier in a disk domain. If disk capacities are not the same, disks with large capacities may not be used effectively. If disk rotating speeds are different, performance may deteriorate.
  • You are advised to use different disk domains to create storage pools for the block storage service and file storage service.
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Updated: 2019-07-12

Document ID: EDOC1100021203

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