Loading...

HotAdd Scenarios

Backup of NFS Datastores

You can perform backups even when VMware datastores are configured on NFS volumes. The Virtual Server Agent and MediaAgent are configured on a Windows virtual machine. During backup, the VSA mounts the VMDKs of the source VMs to itself, using a process called HotAdd. The source VMDKs then appear as a local disk to the VSA. The VSA module reads the VMDK locally, performs deduplication, and sends the data to the MediaAgent module on the same VM to be written to the disk library.

While not as efficient as SAN mode, this configuration ensures that no data is transferred over the IP network during backup.  VM restores are also performed locally. In this mode, a single VSA and deduplication node running on a virtual machine with the recommended resources can provide end-to-end protection for up to 30 TB of VM data.

HotAdd Installations - Virtualized Agent and Virtualized MediaAgent

In this configuration, the Virtual Server Agent and MediaAgent are both installed in HotAdd mode. The backup destination is typically network based (CIFS/NFS) or another VMFS datastore and tape out options are very limited. Shared storage is required for HotAdd backups of virtual machines living on other ESX hosts.

When To Use

  • All virtual environment where physical servers are not preferred.
  • Datastores are configured on NFS.
  • Each MediaAgent can write directly to a mount point presented to the virtual machine.
  • Able to segregate backup and production traffic on the network.

When Not To Use

  • Direct backup to tape is required.
  • Backup traffic cannot be segregated from production traffic.

HotAdd Installations - Virtualized Agent and Physical MediaAgent

In this configuration, the Virtual Server Agent is installed in HotAdd mode while the MediaAgent is installed on a physical computer. Data is transferred over the LAN to the physical MediaAgent. This model also allows for the use of a centralized Windows MediaAgent and Linux MediaAgents. Shared storage is required for HotAdd mode backups of virtual machines living on other ESX hosts.

When To Use

  • Direct backup to tape or SILO to cloud is required.
  • Segregation of backup and production data is possible.
  • Physical MediaAgent is required for other protection tasks and secondary operations.

When Not To Use

  • Segregation of backup and production data is not possible.
  • SAN-based datastores on Fibre Channel or iSCSI are in use. Use an all physical configuration instead.

Last modified: 1/15/2019 10:29:33 PM