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Dell EMC Avamar for VMware 19.7 User Guide

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Instant access

If restoring an entire virtual machine from backups stored on a Data Domain system, a special feature called “instant access” is available.

Instant access is similar to restoring an image backup to a new virtual machine, except that the restored virtual machine can be booted directly from the Data Domain system. This step reduces the amount of time that is required to restore an entire virtual machine.

Instant access comprises the following tasks:

  1. Restoring the virtual machine:
    • Instant access is initiated.
    • Selected VMware backup is copied to temporary NFS share on the Data Domain system.
  2. Performing post-restore migration and clean-up:
    • From the vSphere Client or vSphere Web Client, power on the virtual machine, and then use Storage vMotion to migrate the virtual machine from the Data Domain NFS share to a datastore within the vCenter.
    • When Storage vMotion is complete, the restored virtual machine files no longer exist on the Data Domain system.
    • From Avamar Administrator, ensure that the Data Domain NFS share has been deleted.
  3. The MCS NFS datastore poller automatically unmounts unused Data Domain NFS mounts once daily. Ensure that the NFS mount is unmounted and removed by performing the following:
    • When IA fails due to permission denial for creating VM, DD NFS datastore is mounted in the customer ESXi. The datastore is unmounted automatically every 24 hours. You can also configure unmount time period by changing the following value: 
      <entry key="ddr_nfs_poller_interval_hour" value="24" />
      in /usr/local/avamar/var/mc/server_data/prefs/mcserver.xml
NOTE: When used with Data Domain systems earlier than release 6.0, to minimize operational impact to the Data Domain system, only one instant access is permitted at a time. For Data Domain systems at release 6.0 or greater, 32 instant access processes are permitted at the same time. With DDOS 7.2 and DD 9400, we can support up to 64 instance access at the same time. If you are using the same ESXi host as the target for multiple instant access processes, then to achieve 32 instant access processes, you must increase the values for the following settings on the ESXi host to the maximum supported values:
  • Under NFS, update NFS.MaxVolumes.
  • Under Net, update Net.TcpipHeapSize.
  • Under Net, update Net.TcpipHeapMax.

VMware KB article 2239 contains further information about increasing the limits for these settings. Refer VMware documentation for concurrent Virtual machine migration limits.

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