Configure Volume Dialog (vCD)

To configure the datastore for recovery. If a cluster or resource pool is selected for the host, only datastores that are accessible by every ESX/ESXi host in the cluster or resource pool are displayed.

■ Temp Data disk: If the virtual machine to be replicated includes a temp data disk as part of its configuration, you can specify a mirror disk for replication that is marked as a temp data disk. In this case, data is not replicated to the temp data disk after initial synchronization.

■ Volume Source > vCD Managed Storage policy: Zerto will select a datastore, from the list of available datastores, in the selected Storage Policy in which to place the Volume, unless the datastore is excluded in the Configure Provider vDCs Dialog.

■ Zerto recalculates the datastore available space for each volume sequentially, taking into consideration previously allocated volumes.

■ Volume Source > Preseeded volume: A virtual disk (the VMDK flat file and descriptor) in the recovery site that has been prepared with a copy of the protected data. Zerto recommends using this option particularly for large disks so that the initial synchronization is much faster since a Delta Sync is used to synchronize any changes written to the recovery site after the creation of the preseeded disk. When not using a preseeded disk the initial synchronization phase has to copy the whole disk over the WAN. Browse to the preseed folder configured for the customer and the disk name, of the preseeded disk. In order to use a preseeded VMDK, do the following:

■ Create a folder in vCD to use for the preseeded disks in the datastore you want to use for the customer.

■ To use preseeded disks, a provider datastore must have been specified for preseeded disks in the Configure Provider vDCs Dialog dialog.

■ When using a preseeded VMDK, you specify the exact location, the preseed folder configured for the customer and the disk name, of the preseeded disk. Zerto Virtual Replication takes ownership of the preseeded disk, moving it from its source folder to the folder used by the VRA.

■ If the VPG is defined for a Zerto Organization (ZORG), the location of the preseeded disk must be defined in the Zerto Cloud Manager. For details, see Zerto Cloud Manager Administration Guide.

■ If the virtual machine has more than one preseeded disk, these disks must reside on the same datastore.

■ If the preseeded disk is greater than 1TB on NFS storage, the VPG creation might fail. This is a known VMware problem when the NFS client does not wait for sufficient time for the NFS storage array to initialize the virtual disk after the RPC parameter of the NFS client times out. The timeout default value is 10 seconds. See VMware documentation which describes the configuration option to tune the RPC timeout parameter using the command: http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1027919