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Remote Replication Feature Guide for File 04

OceanStor 5300 V3, 5500 V3, 5600 V3, 5800 V3, and 6800 V3 Storage System V300R002

"This document describes the file system remote replication feature, in terms of the implementation principle,application scenario, and explains how to configure and manage this feature."
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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).
Disaster Recovery

Disaster Recovery

If the production center fails, the DR center must take over services to maintain service continuity.

Disaster Recovery Process

After a remote replication relationship is established between the production center and the DR center, the DR center must take over services for disaster recovery if the production center fails.

Figure 3-1 shows the flowchart for switching services to the DR center.
Figure 3-1  Flowchart for switching services to the DR center

The secondary file system can be shared with the host in the DR center through NFS or CIFS. To ensure that the DR center successfully takes over services from the production center, it is recommended that the secondary file system be shared with the host in the DR center through NFS if the primary file system is shared with the host in the production center through NFS. For details about the disaster recovery configuration operations, see . Similarly, if the primary file system is shared with the host in the production center through CIFS, it is recommended that the secondary file system be shared with the host in the DR center through CIFS. For details about the disaster recovery configuration operations, see .

Configuration Operations (NFS)

If the production center fails, the DR center must take over services to maintain service continuity. If the host in the DR center uses the NFS sharing service to access the storage system, you can enable the DR center to take over services as instructed in this section.

Prerequisites

To ensure that the DR center successfully takes over services, it is recommended that the DR center maintain the same configuration information as the production center. Therefore, before performing a service switchover for disaster recovery, you need to collect related configuration information (such as configuration information related to sharing) from the production center in advance. For details about the configuration information that must be collected in the NFS sharing scenario, see the OceanStor 5300 V3&5500 V3&5600 V3&5800 V3&6800 V3 Storage System V300R002 File Access and Protocols Feature Guide.
NOTE:
The configuration information displayed in the following screenshots is an example. You must configure information based on site requirements.

Context

  • NFS shares can be used in a non-domain environment, an LDAP domain environment, and a NIS domain environment. When NFS shares are used in an LDAP domain environment, the storage system must be added to the LDAP domain. When NFS shares are used in a NIS domain environment, the storage system must be added to the NIS domain.
  • If the production center fails before the remote replication completes the initial synchronization, the DR center cannot take over services.

Procedure

  1. Optional: On the storage system in the DR center, split the remote replication pair.

    NOTE:

    You need to split the pair if its Pair Running Status is Normal.

    1. Log in to DeviceManager of the storage system in the DR center.
    2. Choose Data Protection > Remote Replication.
    3. Select the remote replication pair that you want to split.
    4. Choose More > Split.



  2. On the storage system in the DR center, cancel secondary resource protection to make the secondary file system readable and writable.
    1. On the storage system in the DR center, select the remote replication pair for which you want to cancel secondary resource protection.
    2. Choose More > Disable Protection for Secondary Resource.



  3. On the storage system in the DR center, create a logical port and assign an IP address to it. It is required that the logical IP address can be used to communicate with the host in the DR center.
    1. On the storage system in the DR center, choose Provisioning > Port > Logical Ports.
    2. Click Create to create a logical port and assign an IP address to it.



  4. On the storage system in the DR center, enable the NFS service.
    1. Choose Settings > Storage Settings > File Storage Service > NFS Service.
    2. Based on the protocol version used by the host to mount NFS shares, enable the corresponding NFS service.



      NOTE:

      If host applications do not require NFSv4, it is recommended that you only enable NFSv3.

  5. Optional: On the storage system in the DR center, add the storage system to the domain environment.

    • Add the storage system to the LDAP domain environment.
      NOTE:

      If a file system is shared by using the NFS sharing service in an LDAP domain environment, you must add the storage system to the LDAP domain. Otherwise, skip this step.

      Choose Settings > Storage Settings > File Storage Service > Domain authentication > LDAP Domain Settings.

    • Add the storage system to the NIS domain environment.
      NOTE:

      If a file system is shared by using the NFS sharing service in a NIS domain environment, you must add the storage system to the NIS domain. Otherwise, skip this step.

      Choose Settings > Storage Settings > File Storage Service > Domain authentication > NIS Domain Settings.

  6. Use NFS to share the secondary file system with the host in the DR center.
    1. On the storage system in the DR center, choose Provisioning > Share > NFS (Linux/UNIX/MAC).
    2. Click Create and create an NFS share as prompted.



      NOTE:
      The share path and share name must be set to those specified in the production center. Therefore, you must collect the information in advance.

    3. Add a share client (the host in the DR center) and grant the access permission.



  7. On the host in the DR center, use NFS to mount the shared file system. For details, see OceanStor 5300 V3&5500 V3&5600 V3&5800 V3&6800 V3 Storage System V300R002 Basic Storage Service Guide for File.
  8. Run services on the host in the DR center.

Configuration Operations (CIFS)

If the production center fails, the DR center must take over services to maintain service continuity. If the host in the DR center uses the CIFS sharing service to access the storage system, you can enable the DR center to take over services as instructed in this section.

Prerequisites

To ensure that the DR center successfully takes over services, it is recommended that the DR center maintain the same configuration information as the production center. Therefore, before performing a service switchover for disaster recovery, you need to collect related configuration information (such as configuration information related to sharing) from the production center in advance. For details about the configuration information that must be collected in the CIFS sharing scenario, see the OceanStor 5300 V3&5500 V3&5600 V3&5800 V3&6800 V3 Storage System V300R002 File Access and Protocols Feature Guide.
NOTE:
The configuration information displayed in the following screenshots is an example. You must configure information based on site requirements.

Context

  • CIFS shares can be used in a non-domain environment and an AD domain environment. Local authentication users (user groups) must be configured for CIFS shares in a non-domain environment. The storage system must be added to the AD domain for CIFS shares in an AD domain environment.
  • If the production center fails before the remote replication completes the initial synchronization, the DR center cannot take over services.

Procedure

  1. Optional: On the storage system in the DR center, split the remote replication pair.

    NOTE:

    You need to split the pair if its Pair Running Status is Normal.

    1. Log in to DeviceManager of the storage system in the DR center.
    2. Choose Data Protection > Remote Replication.
    3. Select the remote replication pair that you want to split.
    4. Choose More > Split.



  2. On the storage system in the DR center, cancel secondary resource protection to make the secondary file system readable and writable.
    1. On the storage system in the DR center, select the remote replication pair for which you want to cancel secondary resource protection.
    2. Choose More > Disable Protection for Secondary Resource.



  3. On the storage system in the DR center, create a logical port and assign an IP address to it. It is required that the logical IP address can be used to communicate with the host in the DR center.
    1. On the storage system in the DR center, choose Provisioning > Port > Logical Ports.
    2. Click Create to create a logical port and assign an IP address to it.



  4. On the storage system in the DR center, enable the CIFS service.

    Choose Settings > Storage Settings > File Storage Service > NFS Service, select Enable next to CIFS service, and set parameters.

  5. Optional: On the storage system in the DR center, configure local authentication users (user groups).

    NOTE:
    If a file system is shared by using the CIFS sharing service in a non-domain environment, you must configure local authentication users (user groups). Otherwise, skip this step.

    1. Create local authentication users (user groups).

      1. On the storage system in the DR center, choose Provisioning > User Authentication > Local Authentication User Group.
      2. Click Create and create a local authentication user group as prompted.

    2. Create a local authentication user.

      1. On the storage system in the DR center, choose Provisioning > User Authentication > Local Authentication User.
      2. Click Create and create a local authentication user as prompted.

  6. Optional: On the storage system in the DR center, add the storage system to the AD domain.

    NOTE:
    If a file system is shared by using the CIFS sharing service in an AD domain environment, you must add the storage system to the AD domain. Otherwise, skip this step.

    1. Configure the connectivity between the storage system and the DNS server.

      Choose Settings > Basic Inforamtion > DNS Service.

      NOTE:

      Standby DNS IP Address 1 and Standby DNS IP Address 2 are optional. If you want to set them, set Standby DNS IP Address 1 first and then Standby DNS IP Address 2.

    2. Add the storage system to the AD domain.

      Choose Settings > Storage Settings > File Storage Service > Domain authentication > AD Domain Settings.

  7. Use CIFS to share the secondary file system with the host in the DR center.
    1. On the storage system in the DR center, choose Provisioning > Share > CIFS (Windows/MAC).
    2. Click Create and create a CIFS share as prompted.



      NOTE:
      The share path and share name must be set to those specified in the production center. Therefore, you must collect the information in advance.

    3. Grant the CIFS share access permission to the user or user group.



  8. On the host in the DR center, use CIFS to mount the shared file system. For details, see OceanStor 5300 V3&5500 V3&5600 V3&5800 V3&6800 V3 Storage System V300R002 Basic Storage Service Guide for File.
  9. Run services on the host in the DR center.
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Updated: 2019-01-02

Document ID: EDOC1000069276

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