{"id":3849,"date":"2015-09-04T11:33:18","date_gmt":"2015-09-04T11:33:18","guid":{"rendered":"http:\/\/evolphin.com\/help\/?p=3849"},"modified":"2020-05-18T10:50:59","modified_gmt":"2020-05-18T14:50:59","slug":"understanding-hadr-archive","status":"publish","type":"post","link":"https:\/\/evolphin.com\/help\/administration-server\/hadr\/understanding-hadr-archive\/","title":{"rendered":"Understanding HADR Archive"},"content":{"rendered":"\n

Minimum Zoom version supported: 5.5<\/span>
 
Archive module can be configured by following this article:  HADR Archive Configuration<\/a>.<\/p>\n\n\n\n

Features<\/h2>\n\n\n\n
  1. HADR Archive<\/span> brings the functionality of Archiving assets in a distributed manner.<\/li>
  2. Multiple OR Single Zoom server can be configured to archive the assets.<\/li>
  3. Multiple OR Single Zoom server can be configured to run the archive\/restore scripts.<\/li>
  4. HADR Archive can be done on Multiple Zoom servers with shared database.<\/li><\/ol>\n\n\n\n

    Archive Process<\/h2>\n\n\n\n
    1. Archive request received by Zoom server are submitted for execution. Clients will get a notification that archive request is submitted.<\/li>
    2. Archive request will be aborted, if none of the Zoom servers have valid archive location. Archive location should be given and exist on disk.<\/li>
    3. Pre-Archive Script will be executed if provided. Archive operation will be aborted if script returns non zero status.\n
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      1. If emails are configured, then failure notifications will be triggered via email.<\/li>\n<\/ol>\n<\/li>
      2. If assets are eligible for Archiving, they will be marked as Archive. At this level, no data has moved out of database to archive location.<\/li>
      3. When Zoom database writer<\/a> server restarts, it will compute the checksum of assets and eventually will mark them as fully archived.\n
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        1. At this stage it is not possible to restore the assets until server is restarted again and transfers the files to Archive Location.<\/span><\/strong><\/li>\n<\/ol>\n<\/li>
        2. Now when Zoom database writer server restarts again, files will be transferred to Archive location.\n
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          1. Once file transfer finish, Zoom server will run the post archive scripts.<\/li>\n
          2. And mail notifications are sent out.<\/li>\n<\/ol>\n<\/li><\/ol>\n\n\n\n

            Restore Process<\/h2>\n\n\n\n
            1. Restore request can only be accepted on archived assets.<\/li>
            2. HADR restore is done in three phases.\n
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              1. First phase: Run pre-restore scripts if configured.\n
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                1. Note: If script returns exit status zero, then only restore process will move forward, else it would be aborted.<\/li>\n<\/ol>\n<\/li>\n
                2. Second phase: Copy\/download the archived files to Zoom database location.\n
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                  1. Note: This process might be time consuming and depends on number of files and their size.<\/li>\n
                  2. At least one of the Zoom server must have access to archive location and archive location must contain valid archived files.<\/li>\n<\/ol>\n<\/li>\n
                  3. Third phase: Marking the files as restored in Zoom database. Only after the successful completion of this this process files would be restored and available to users.<\/li>\n<\/ol>\n<\/li>
                  4. Emails are sent out if case of success or failures.<\/li><\/ol>\n\n\n\n

                    Example<\/h2>\n\n\n\n

                    All Zoom servers with shared database<\/h2>\n\n\n\n

                    In this example we assume there are three Zoom servers with shared database. All Zoom servers are configured to use single database location.
                    Our example servers are:<\/p>\n\n\n\n

                    1. http:\/\/acme-server1<\/strong>:8880 (*database writer)<\/strong>\n
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                      1. http:\/\/acme-server1<\/strong>:8443<\/li>\n<\/ol>\n<\/li>
                      2. http:\/\/acme-server2<\/strong>:8880\n
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                        1. http:\/\/acme-server2<\/strong>:8443<\/li>\n<\/ol>\n<\/li>
                        2. http:\/\/acme-server3<\/strong>:8880\n
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                          1. http:\/\/acme-server3<\/strong>:8443<\/li>\n<\/ol>\n<\/li><\/ol>\n\n\n\n

                            All above three servers are configured to use database location: “\/acme-network-storage\/zoom-database”. <\/strong>This location is present on Network attached storage and shared to each server via\u00a0NFS.<\/p>\n\n\n\n