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Dell NetWorker 19.9 Administration Guide

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Determining the storage node for recovering cloned data

The storage node from which clone data is recovered depends on whether the source volume is mounted or unmounted, as well as environment variable settings.

To control the storage node from which cloned data is recovered, ensure that the source volume is mounted on the device for the storage node. Alternatively, list the storage node in the Recover storage nodes attribute of the Client resource that is being recovered and in the Read Hostname attribute for the Library resource, if the source volume is in a media library. You must select View > Diagnostic Mode in the Administration interface to access the Recover storage nodes and Read Hostname attributes in the Client Properties dialog box.

-J SNhost, source storage node, is a forced volume location from which the NetWorker Server attempts to read a selected volume. To read the selected volume, either the volume must already be mounted on that forced volume location or the forced volume location must have a device that can mount the selected volume. If -b pool_name is mentioned, the pool selection is restricted.

Recovery operation logic for selecting the storage node from which to recover cloned data

The recovery operation uses the following logic to determine the storage node from which to recover cloned data:

  1. If the source volume is mounted, then the storage node of the device on which the volume is mounted is used as the read source except in the following scenarios:

    • If the FORCE_REC_AFFINITY environment variable is set to Yes.
    • In a Virtual Tape Library (VTL) environment such as a CLARiiON Disk Library (CDL).

    In these scenarios, the NetWorker software ignores whether the source volume is mounted and behaves as though the volume is not mounted.

    NOTE: If -S ssid/cloneid is used then the recovery operation picks up the exact copy. If only -S ssid or the save set path is used, any valid copy can be read.

  2. If the source volume is not mounted, or the FORCE_REC_AFFINITY environment variable is set to Yes, then the NetWorker software creates a list of eligible storage nodes, based on the following criteria:

    • The storage node is listed in the Recover storage nodes attribute of the NetWorker Client resource that is being recovered.

      If there are no storage nodes in the list and the Autoselect storage node checkbox in the Client resource is clear, then the clone operation uses the value in the Storage Nodes attribute for the Client resource.

      If there are no storage nodes in the list and the Autoselect storage node checkbox in the Client resource is selected, then the recovery operation uses autoselect logic to choose the storage node.

    • If the requested volume is in a media library, then the storage node is listed in the Read Hostname attribute for the Library resource is used.

      If the Read Hostname attribute for the Library resource is not set, then all storage nodes on which any device in the library is configured are added to the list of eligible storage nodes.

      NOTE:If the volume is not in a media library, then the list of storage nodes is based only on the criterion for storage node settings in the NetWorker server Client resource.

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