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Sun Ray is a stateless thin-client solution from Sun Microsystems, Inc., that is aimed at corporate environments. The Sun Ray architecture consists of two components: the Sun Ray thin client DTU (desktop unit) and the Sun Ray Server Software. The Sun Ray DTU is typically a display device that requires no desktop administration yet provides the experience users expect from a high-end workstation. With the Sun Ray smart card interface, a user simply inserts a smart card into any available Sun Ray thin client and instantaneously accesses an existing session. The Sun Ray Server Software provides user authentication and encryption between server and client as well as user session management. It not only enhances security, but also helps reduce the complexity and administration of the IT environment. The Leostream Connection Broker can be configured to interact with the Sun Ray server software, so that users connecting via the Sun Ray thin client DTU are provided with easy and instant access to remote VMs.

Once a user inserts his smart card into the Sun Ray DTU, the DTU reads the card and sends the unique card token to the Sun Ray Server Software (SRSS) component on the Sun Ray server via the highly efficient Sun Appliance Link Protocol (ALP). Upon receipt of the token, the Sun Ray server automatically launches Leostream Connect for Linux, where the users enter their authentication credentials. Leostream Connect then passes the user credentials to the Leostream Connection Broker which looks up the user in the authentication server, determines which policies to apply, and offers desktops. Using Leostream Connect, the user selects which desktop to log in to. Leostream Connect passes this information to the Connection Broker. The Connection Broker also sends Leostream Connect the list of Sun Ray servers associated with the VirtualCenter cluster on which the selected desktop sits. If a switch is needed, the Connection Broker picks a random Sun Ray server from the list and redirects the DTU to this host. The client launches one or more RDP sessions using the Sun Ray Connector for Windows. Using this setup, the high-latency link to the SRSS is traversed using ALP and the low latency link between the SRSS server and the desktop is crossed using RDP, with the SRSS server acts as a proxy. In the end, each user has his/her own DTU connected to a Sun Ray server, and the Sun Ray Connector for Windows connects them to a desktop using the RDP protocol.

This test monitors the SunRay servers that the Connection Broker has discovered from VC clusters, and reports the status of each server.

Measurement	Description	Measurement Unit	Interpretation
Is_alive	Indicates whether the SunRay server is currently available for use or not.	boolean	If the Sun Ray host is free, then this measure will report the value 1. If the Sun Ray host is not available, then the measure will report the value 0.
Is_active	Indicates whether the Sun Ray server is currently active or not.	boolean	If the Sun Ray host is being actively used, then this measure will report the value 1. If the Sun Ray host is available but not actively used, then the measure will report the value 0.