This article provides an overview of Citrix Provisioning components.
The license server is installed within the shared infrastructure or you can use an existing Citrix license server. You select the license server when running the Configuration Wizard for the first time. All Provisioning Servers within the farm must communicate with the license server.
Citrix Provisioning database
The database stores all system configuration settings that exist within a farm. Only one database can exist within a farm and all Provisioning Servers in that farm must be able to communicate with that database. You may choose to use an existing SQL Server database or install SQL Server Express, which is free and available from Microsoft.
The database server is selected when the Configuration Wizard is run on a Provisioning Server.
The Console is a utility that is used to manage your Citrix Provisioning implementation. After logging on to the Console, you select the farm that you want to connect to. Your administrative role determines what you can view in the Console and manage in the farm.
Network services include a DHCP service, Preboot Execution Environment (PXE) service, and a TFTP service. These service options can be used during the boot process to retrieve IP addresses. These options can also be used to locate and download the boot program from the Provisioning Server to the target device. Alternative boot options are also available.
Network services can be installed with the product installation, and then configured using the Configuration Wizard.
A farm represents the top level of a Citrix Provisioning infrastructure. The farm is created when the Configuration Wizard is run on the first Provisioning Server added to that farm.
All sites within a farm share that farm’s Microsoft SQL database.
The Console does not need to be directly associated with the farm because remote administration is supported on any Console that can communicate with that farm’s network.
A farm contains one or more stores. A store is a logical name for a physical or virtual vDisk storage location. The store name is the common name used by all Provisioning Servers within the farm.
One or more sites can exist within a farm. The first site is created with the Configuration Wizard and is run on the first Provisioning Server in the farm.
Sites are represented in the Console as follows:
A Provisioning Server is any server that has Stream Services installed. The Stream Service is used to stream software from vDisks to target devices. In some implementations, vDisks reside directly on the Provisioning Server. In larger implementations, Provisioning Servers may get the vDisk from a shared-storage location on the network.
Provisioning Servers also exchange configuration information with the Citrix Provisioning database. Provisioning Server configuration options are available to ensure high availability and load balancing of target device connections.
vDisks exist as disk image files on a Provisioning Server or on a shared storage device. A vDisk consists of a .vhdx base image file, any associated properties files (.pvp), and if applicable, a chain of referenced VHD differencing disks (.avhdx).
vDisks are assigned to target devices. Target devices boot from and stream software from an assigned vDisk image.
vDisk pools are the collection of all vDisks available to a site. There is only one vDisk pool per site.
vDisk update management
The vDisk Update Management feature is used to configure the automation of vDisk updates using virtual machines. Automated vDisk updates can occur on a scheduled basis, or can be invoked directly from the Console. This feature supports updates detected and delivered from Electronic Software Delivery (ESD) servers, Windows updates, or other pushed updates.
vDisk images are configured for Private Image mode or Standard Image mode. Consider the following when using vDisk images:
- In Private Image mode, a vDisk image is used as a single device supporting read/write characteristics.
- In Standard Image mode, a vDisk image is used by multiple devices, but is read-only when using various caching options.
Any updates to a vDisk base image can be captured in a versioned differencing disk, leaving the original base disk image unchanged.
Each time a vDisk is updated, a new version of the VHDX differencing disk can be created and the file name is numerically incremented, as shown in the following table:
|vDisk image||VHDX Filename|
Booting a vDisk
The following image shows the method used to locate and boot from a vDisk on a server share:
The preceding image illustrates the following steps:
- The target device begins the boot process by communicating with a Provisioning Server and acquiring a license.
- The Provisioning Server checks the vDisk pool for vDisk information, which includes identifying the Provisioning Servers providing the vDisk to the target device. The server also verifies the path information the server uses to get to the vDisk. In this example, the vDisk shows that only one Provisioning Server in this site can provide the target device with the vDisk and that the vDisk physically resides on the Finance Server (shared storage at the farm level.
- The Provisioning Server locates the vDisk on Finance Server, then streams that vDisk, on demand, to the target device.
The following examples provide information about how Citrix Provisioning uses vDisk images.
The physical vDisk for Windows 10 resides on a Provisioning Server local to a site. The logical name that is given to this physical location is the store.
Store name (logical name): bostonwin10
Physical path to the vDisk is: C:\vDisks\
The physical vDisk for Windows 10 resides on a network share (FinancevDisks) at the farm level.
Store name (logical name): FinancevDisks
Physical path to the vDisk for all Provisioning Servers in the farm is: \financeserver\financevdisks\
Device collections are logical groups of target devices. A target device is a device, such as a desktop computer or a server, that boots and gets software from a vDisk on the network. A device collection could represent a physical location, a subnet range, or a logical grouping of target devices. Creating device collections simplifies device management by enabling you to perform actions at the collection level rather than at the target-device level.
Views allow you to quickly manage a group of target devices. Views are typically created according to business needs. For example, a view can represent a physical location, such as a building, or a user type. A target device can be a member of any number of views, although it can be a member of only one device collection.
Views are represented in the Console as follows:
Farm views can include any target device that exists in the farm. Site views include only target devices that exist within a site.