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NetScaler SDX uses the XenServer hypervisor to partition its acceleration services by carriers and service providers, so that individual accelerators can be created for separate cloud customers.

SDX administrators can assure their cloud customers of uninterrupted acceleration only if they can ensure the high availability of the XenServer that underlies the SDX appliance. For this purpose, administrators can use the SDX XenServer Uptime test.

This test monitors the uptime of the SDX XenServer and promptly alerts administrators if an unscheduled reboot occurred or if a scheduled reboot failed.

Outputs of the test : One set of results for the target NetScaler SDX appliance being monitored.

Measurement	Description	Measurement Unit	Interpretation
Rebooted	Indicates whether the server has been rebooted during the last measurement period or not.	Boolean	If this measure shows 1, it means that the server was rebooted during the last measurement period. By checking the time periods when this metric changes from 0 to 1, an administrator can determine the times when this server was rebooted. The detailed diagnosis of this measure, if enabled, will provide you with the details of the last reboot of the XenServer. Such details will include the shutdown date/time, reboot date/time, the shutdown duration (in minutes), and whether the host has been configured for maintenance or not.
Uptime	Indicates the time period that the system has been up since the last time this test ran.	Seconds	If the server has not been rebooted during the last measurement period and the agent has been running continuously, this value will be equal to the measurement period. If the server was rebooted during the last measurement period, this value will be less than the measurement period of the test. For example, if the measurement period is 300 secs, and if the server was rebooted 120 secs back, this metric will report a value of 120 seconds. The accuracy of this metric is dependent on the measurement period - the smaller the measurement period, greater the accuracy.
Total_uptime	Indicates the total time that the device has been up since its last reboot.	Mins	Administrators may wish to be alerted if a server has been running without a reboot for a very long period. Setting a threshold for this metric allows administrators to determine such conditions.