Attaching a Disk to an Existing VM for VMware

From VMware virtual machine backups, you can restore a virtual machine disk and attach it to an existing VM.

Before You Begin


  1. From the navigation pane, go to Protect > Virtualization.

    The Virtual machines page appears.

  2. Click the VM groups tab.

    The VM group page appears. The VM groups area displays summary information for any existing VM groups.

  3. In the VM groups area, click Restore for the VM group that contains the virtual machine.

    The Select restore type page appears.

  4. Select Attach disk to disk existing VM to restore individual VMDK files and attach VMDKs to an existing virtual machine.

    The Restore page appears.

  5. To choose a different MediaAgent or source copy for the restore, do the following:

    1. In the upper-right corner of the page, click Settings.

      The Settings dialog box appears.

    2. For MediaAgent, decide whether to have the Commvault software automatically select the MediaAgent or to specify a MediaAgent:

      • Automatic: By default, the Commvault software selects the MediaAgent for the restore operation based on availability and environment.

      • To restore data using a specific MediaAgent, from the list, select a MediaAgent.

    3. For Source, decide whether to have the Commvault software automatically select the copy of backup data or to specify the copy:

      • Automatic: By default, the restore operation searches for the requested data in the primary copy and selects a different copy if the data is not found in the primary copy.

      • To restore from a specific copy of backup data, from the list, select a backup copy.

    4. Click Save.

  6. On the left, expand the tree and select the objects to be restored on the right. Select an item or click on an entry in the Name column to browse within an item. For hierarchical data such as files, folders, and disks, you can click an entry in the path listing above the right pane to return to a higher level of the hierarchy.

    In the top right corner of the page, a "Showing" message indicates what backup data is being displayed. You can click the down arrow beside this message and select any of the following options:

    • Show latest backups: Only display data for the most recent backups.

    • Show backups as of a specific date: Only display data up to the date you specify.

    • Show backups for a date range: Only display data within the data range you specify.

  7. Click Restore.

  8. The Restore options dialog box displays as follows:

    • For Admin users, both the Other Virtual Machine and the My Virtual Machine tabs display. Admin Users should choose one of the tabs and continue either to the Other Virtual Machine Tab or the My Virtual Machine Tab sections that follow.

    • For End Users, the My Virtual Machine tab appears alone. End Users should continue to the My Virtual Machine Tab section that follows.

Other Virtual Machine Tab

Complete this tab as directed at the end of the procedure at the beginning of this topic.

  1. To restore to a VM on a different hypervisor, select the hypervisor name from the Destination hypervisor list.

  2. From the Access node list, select the access node or the access node group to use for the restore operation.

    If you select Automatic, the Commvault software performs the restore operation using the most suitable access node from the VMware destination hypervisor.

    If you select an access node group, the Commvault software performs the restore operation using the most suitable access node that is available in the access node group.

    For access node selection, the Commvault software checks through the same host and the same datastore. If no host or datastore match is found, then any of the available access nodes from the selected destination hypervisor or access node group is used.

  3. To select a destination VM, click Browse and select the virtual machine to which the restored disk should be attached.

  4. To delete an existing virtual disk file and replace it with the restored file, select Overwrite if it already exists.

  5. For Disk Provisioning, use the default value (Original) to retain the provisioning method used at the time of backup. Select a value from the Disk Provisioning list to force a specific disk provisioning method: Thick Lazy Zero, Thin, or Thick Eager Zero.

  6. For Transport mode for VMware, select one of the following options:

    • Auto: The transport mode is selected automatically based on the backup environment:

    • If the datastore is accessible to a physical proxy, SAN is used.

    • If the datastore is accessible to the ESX server for a virtual proxy, HotAdd is used.

    • Otherwise, NBD is used.

    • SAN: For directly connected storage using Fibre Channel (FC) or Internet SCCI (iSCSI) protocols. The Virtual Server Agent must have access to the datastore LUNs (logical drives) that provide storage for virtual machine disks. Data is read directly from the storage where virtual machines reside, without going through the ESX host or transferring data over the local area network (LAN). The ESX host is contacted only to coordinate access to the LUN. SAN transport mode cannot be used if the proxy computer is a virtual machine.

    • Hot Add: The Virtual Server Agent is installed on a virtual machine residing on an ESX server. In HotAdd mode, the data volumes containing the virtual machines to be backed up are automatically mounted to the proxy, so they can be accessed by the proxy as a local disk. The ESX host the proxy is running on must have access to all datastores for the virtual machine. If the virtual machine and the proxy are not on the same host, all datastores must be shared between the hosts.

    • NBD: Data is transferred using the TCP/IP connection between the ESX server and the proxy computer. The local area network (LAN) can be the production network or a dedicated backup network.

    • NBD SSL: Similar to NBD mode, but data transfer between the proxy computer and the ESX server is encrypted. Encryption should be used for sensitive information, even within a private network.

    • NAS: NAS (network attached storage) transport mode enables the virtual server agent (VSA) proxy computer to read data directly from the network file server (NFS), without going through an ESX host or transferring data over the local area network (LAN).

  7. To use a different datastore for the restored VM disk, select the new datastore from the Datastore list.

  8. Click Submit to run the restore job.

My Virtual Machine Tab

Complete this tab as directed at the end of the procedure at the beginning of this topic.

  1. From the Select destination VM list, select the existing VM where you want to attach the disk.

  2. You can rename the disk while it is attached for the restore. If you want to rename the disk, select the disk you want to attach, and in the Disk Name field, enter the name of the disk.

  3. Select the Unconditionally overwrite if it already exists toggle to overwrite an existing disk.

  4. If you do not want to receive an email when the backup job completes, unselect the When the job completes, notify me via email checkbox.

  5. Click Submit to run the restore job.