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CloudBackup Feature Guide

OceanStor Dorado V3 Series V300R002

This document is applicable to OceanStor Dorado3000 V3, Dorado5000 V3, Dorado6000 V3, and Dorado18000 V3. It describes the implementation principles and application scenarios of the CloudBackup feature, and explains how to configure and manage CloudBackup.

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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).
Backup

Backup

Basic Concepts

Table 1-1 Basic concepts

Concept

Description

Read-only snapshot

A copy of the source data at a specific point in time.

Snapshot comparison

Compares the difference between two read-only snapshots. During incremental backup, only differential data is backed up.

Full backup

Backs up all data in the LUN or LUN consistency group. By default, the first backup is a full backup.

Full backup takes a long time and occupies a large space.

Incremental backup

Backs up the differential data since the last backup. After the first backup is complete, incremental backup is performed by default in follow-up tasks.

Only a small amount of data is backed up each time, reducing the backup duration.

Offline storage unit

CloudBackup can perform the first full backup offline by using the Teleport device of Huawei Data Express Service (DES). This greatly reduces the time for the first backup.

The offline storage unit is the storage space for storing the backup data on the Teleport device.

Offline transmission

A data transmission mode for backup to object storage on the cloud. Data is first backed up to a local Teleport device, which will then be shipped to the Huawei data center where the data is imported to the object storage.

Backup storage pool

Composed of a storage unit, which is the basic unit for storing backup data.

Backup storage pools are physically isolated from each other. Failure of any pool does not affect other pools.

Repository

A space in a backup storage pool. Repositories are logically isolated.

Backup plan

Defines the scope of backup. It consists of protected objects (LUNs or LUN consistency groups), a backup policy, and a repository.

The backup plan executes backup tasks for the protected objects according to the specified policy. The generated backup images are stored in the repository.

Backup image

Backup data generated by a backup task. Each backup image is marked with its creation time. When restoring the data, you can select the desired backup image based on the time stamp.

Relationships Between Storage Units, Backup Storage Pools, and Repositories

Figure 1-1 illustrates the relationships between storage units, backup storage pools, and repositories.

Figure 1-1 Relationships between storage units, backup storage pools, and repositories
  1. CloudBackup creates backup storage pools using the storage space provided by the backup storage device. A backup storage pool consists of a storage unit.
  2. CloudBackup divides each backup storage pool into one or more repositories, which save the backup data and provide data sources for restoration.

Backup Process

Figure 1-2 shows how CloudBackup backs up data.

Figure 1-2 Data backup process
  1. Creates a read-only snapshot for the protected object.

    If the protected object is a LUN, a read-only snapshot is created for the LUN; if the protected object is a LUN consistency group, a read-only snapshot consistency group is created.

  2. Obtains the addresses of the data to be backed up.

    If full backup is performed, the system obtains the addresses allocated to the valid data in the LUN or LUN consistency group. If incremental backup is performed, the system compares the snapshots to obtain the addresses of the changed data since the last backup.

  3. Saves data to the backup storage.

    The system reads the data from the read-only snapshot or snapshot consistency group according to the addresses of the data to be backed up, and then transmits the data to the specified NAS shared directory in the local data center or the object storage on the cloud.

  • The system only retains the read-only snapshot (or read-only snapshot consistency group) generated by the latest successful backup. Earlier read-only snapshots (or read-only snapshot consistency groups) were deleted after the latest successful backup.
  • Do not manually delete the read-only snapshot or (or read-only snapshot consistency group) generated by the backup plan. If you delete the read-only snapshot (or read-only snapshot consistency group), the next backup task will be a full backup.
NOTE:

To query the read-only snapshot or snapshot consistency group generated by a backup plan, choose Provisioning > LUN (or Provisioning > LUN > LUN Consistency Group) on DeviceManager. Then select the protected object of the backup plan and click the HyperCDP or HyperCDP Consistency Group tab in the lower pane. The name of the read-only snapshot (or read-only snapshot consistency group) starts with CloudBk.

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Updated: 2019-07-17

Document ID: EDOC1100067320

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