The device Type is selected on the Target Device Properties General tab, unless it is an Update device, which is created automatically when the managed vDisk is created. Device types include:
Maintenance devices can access any available version of a vDisk. A Maintenance device's primary role is update a vDisk manually. To do this, a new version is requested from the vDisk Versions Dialog, which creates a new read/write differencing disk and places that newly created version in Maintenance Access mode. While in Maintenance mode, this version of the vDisk can only be accessed by a single maintenance device (the first maintenance device that accesses it). Using that device, the vDisk is booted and any updates that are made are captured in the new differencing disk version. After updates are complete, the maintenance version can be promoted to Test mode or directly to Production mode.
In Maintenance Mode, a new version can also be created by merging existing versions into a new version or new base disk image. For additional information on merging vDisks, refer to Merging VHDX Differencing Disks
While in Test mode, this version of the vDisk can only be streamed to Test or Maintenance devices to which it is assigned. This allows the new version to be tested before being released into the production environment, and permits Production devices to continue to stream from the previous version without interruption. If issues are found, this version can be reverted back into Maintenance mode.
If you are testing a device that uses a personal vDisk, use the assigned PvD Test device to test vDisk updates.
After successfully testing the new version, that version can be promoted to Production mode and made available to Product, Test, and Maintenance devices to which it is assigned. If issues are found, this version can be reverted back into either Test or Maintenance mode after any booted devices accessing this version are shut down.
If a device is assigned a personal vDisk, after the updated vDisk is tested using a PvD Test device, you can change the device to be a PvD production device, which allows you to continue testing for compatibility within your production environment.
Update devices are used to update a Managed vDisk. Update Devices are created automatically when the Managed vDisk Setup Wizard is run. Only one Update device exists for each managed vDisk, and that vDisk and Update device are given the same name. For more information on Managed vDisks, refer to vDisk Update Management.