Disaster recovery

[EcoStruxureIT]

You can configure an up-to-date backup recovery server in a remote location for resuming operation in the event of a disaster.

You can add one disaster recovery node to a stand-alone IT Advisor (ITA) server. Licensing for a disaster recovery node (DR) is part of the base IT Advisor license.

PostgresSQL streaming replication is used to move data to the disaster recovery node. Communication is necessary through ports 22, 80 and 5432. The disaster recovery node also needs to able to 'ping' the IP address that it gets attached to.

The connection between the ITA server and the disaster recovery node must be stable and quick enough to transfer a full backup.

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Configuring disaster recovery

1. Allow the Disaster Recovery node to connect to the ITA server.
   
   1. Selecting Administration > Webmin in the ITA web client to open the Webmin web interface on theITA server.
      Alternatively, type the address of your ITA server in a Web browser followed by :10000, <https://>:10000.
   2. Log into Webmin and select EcoStruxure IT Advisor > Disaster Recovery.
   3. Select the option Allow another node to connect to this node. Enter the IP to allow as disaster recovery node. Push Attach. And then Accept the fingerprint and allow the Disaster Recovery node (.53 in the example) to connect to this node (.52 in the example). Figure 1.
2. Configure the Disaster Recovery node.
   1. Install ITA on a dedicated remote server with stand-alone Disaster Recovery configuration (.53 in the example). See how.
   2. Open the Webmin interface on the Disaster Recovery server.
      1. Type the Disaster Recovery server's IP address in a Web browser.
      2. On the download page, click Server Configuration.
         This opens the Webmin server configuration interface on the Disaster Recovery server.
      3. Log into Webmin using the user credentials created during installation (step 2a). Select EcoStruxure IT Advisor > Disaster Recovery.
   3. Select the option Attach this node as a disaster recovery node to another node. Enter the IP address of server to be attached to. Attach. And then, Accept the fingerprint and attach this node as Disaster Recovery node. Figure 2.

You have now configured Disaster Recovery. In case of a disaster and shutdown of the ITA server, you can promote the Disaster Recovery to a stand-alone ITA server.

Note

If the Disaster Recovery node is monitored, for example by DCE via SNMP, it is important to set the device scan timeout in DCE high enough for the Disaster Recovery to respond. Otherwise, it will return 'communication lost'.

How you set the device scan timeout depends on the network speed between the Disaster Recovery and the ITA server.

Figure 1

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Figure 2

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Promoting disaster recovery

1. Open the Webmin interface on the Disaster Recovery server (.53 in the example).
   1. Type the Disaster Recovery server's IP address in a Web browser.
   2. On the download page, click Server Configuration.
      This opens the Webmin server configuration interface on the Disaster Recovery server.
   3. Log into Webmin and select EcoStruxure IT Advisor > Disaster Recovery.
2. Verify the data shown is correct, and select Promote disaster recovery node. You have now restored a copy of your ITA server.

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Re-enabling after disaster recovery

Reconfigure your main server as it was before the disaster occurred, and then follow the steps below to re-enable the disaster recovery node:

1. Create a backup of the disaster recovery server.
2. Restore the backup on your main ITA server(s).
3. Repeat the steps in Configuring disaster recovery to reconfigure your setup as it was before promoting disaster recovery.

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