Client - side deduplication backup process

Article:HOWTO70546  |  Created: 2012-02-07  |  Updated: 2012-02-07  |  Article URL http://www.symantec.com/docs/HOWTO70546
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Client - side deduplication backup process

Figure: Deduplication client backup to a media server deduplication pool shows the backup process of a client that deduplicates its own data. The destination is a media server deduplication pool. A description follows.

Figure: Deduplication client backup to a media server deduplication pool

Deduplication client backup to a media server deduplication pool

The following list describes the backup process for a deduplication client to a media server deduplication pool:

  • The NetBackup Job Manager (nbjm) starts the Backup/Restore Manager (bpbrm) on a media server.

  • The Backup/Restore Manager probes the client to determine if it is configured and ready for deduplication.

  • If the client is ready, the Backup/Restore Manager starts the following processes: The OpenStorage proxy server (nbostpxy) on the client and the data moving processes (bpbkar) on the client and bptm on the media server).

    NetBackup uses the proxy plug-in on the media server to route control information from bptm to nbostpxy.

  • The Backup/Archive Manager (bpbkar) generates the backup images and moves them to the client nbostpxy process by shared memory.

    The Backup/Archive Manager also sends the information about files within the image to the Backup/Restore Manager (bpbrm). The Backup/Restore Manager sends the file information to the bpdbm process on the master server for the NetBackup database.

  • The client nbostpxy process moves the data to the deduplication plug-in.

  • The deduplication plug-in retrieves a list of fingerprints from the last full backup for the client from the NetBackup Deduplication Engine. The list is used as a cache so the plug-in does not have to request each fingerprint from the engine.

  • The deduplication plug-in performs file fingerprinting calculations.

  • The deduplication plug-in sends only unique data segments to the storage server, which writes the data to the media server deduplication pool.

Figure: Deduplication client backup to a PureDisk storage pool shows the backup process of a client that deduplicates its own data. The destination is a PureDisk storage pool. A description follows.

Figure: Deduplication client backup to a PureDisk storage pool

Deduplication client backup to a PureDisk storage pool

The following list describes the backup process for a deduplication client to a media server deduplication pool:

  • The NetBackup Job Manager (nbjm) starts the Backup/Restore Manager (bpbrm) on a media server.

  • The Backup / Restore Manager probes the client to determine if it is configured and ready for deduplication.

  • If the client is ready, the Backup/Restore Manager starts the following processes: The OpenStorage proxy server (nbostpxy) on the client and the data moving processes (bpbkar on the client and bptm on the media server).

    NetBackup uses the proxy plug-in on the media server to route control information from bptm to nbostpxy.

  • The Backup/Archive Manager (bpbkar) generates the backup images and moves them to the client nbostpxy process by shared memory.

    The Backup/Archive Manager also sends the information about files within the image to the Backup/Restore Manager (bpbrm). The Backup/Restore Manager sends the file information to the bpdbm process on the master server for the NetBackup database.

  • The client nbostpxy process moves the data to the deduplication plug-in.

  • The deduplication plug-in retrieves a list of fingerprints from the last full backup for the client from the NetBackup Deduplication Engine. The list is used as a cache so the plug-in does not have to request each fingerprint from the engine.

  • The deduplication plug-in performs file fingerprinting calculations.

  • The deduplication plug-in sends only unique data segments to the PureDisk storage pool.

See About the NetBackup Media Server Deduplication Option

See Deduplication storage server components

See Media server deduplication process

See Deduplication client components

See About deduplication fingerprinting

See Data removal process


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