Data Availability

Real-time data appears in the performance charts only for hosts and virtual machines when they are connected and powered on. Historical data appears for all supported inventory objects, but might be unavailable during certain circumstances.

Table 5 lists the scenarios in which performance charts are empty with the label "No data available." Each scenario assumes that the default rollup configuration for the vCenter Server system has not changed.

Table 5. Scenarios for Unavailable Performance Data

Chart Time Range	Behavior
Real time	Real-time statistics are not available for disconnected hosts or powered off virtual machines. The charts are empty with the label "No data available."
1 day	The real-time statistics are collected on hosts and aggregated every 5 minutes. After six data points are collected (30 minutes), they are rolled up to the vCenter Server database to create the 1 Day statistics. 1 Day statistics might not be available for 30 minutes after the current time, depending on when the sample period began. The charts are empty with the label "No data available."
1 week	The 1 Day statistics are rolled up to create one data point every 30 minutes. If there is a lag in the rollup operation, the 1 Week statistics might not be available for 1 hour after the current time (30 minutes for the 1 Week collection interval + 30 minutes for the 1 Day collection interval). The charts are empty with the label "No data available."
1 month	The 1 Week statistics are rolled up to create one data point every 2 hours. If there is a lag in the rollup operations, the 1 Month statistics might not be available for 3 hours (2 hours for the 1 Month collection interval + 1 hour for the 1 Week collection interval). The charts are empty with the label "No data available."
1 year	The 1 Month statistics are rolled up to create one data point every day. If there is a lag in the rollup operations, the statistics might not be available for 1 day and 3 hours (1 day for the past year collection interval + 3 hours for the past month collection interval). During this time, the charts are empty with the label "No data available."

Note

If you select a datacenter in the inventory and the datacenter does not yet contain a host or cluster, the overview performance data will not be available. Instead, the following message appears on the Overview tab:

No performance view is available for the given managed object."

 

Related tasks

Set the Time Range for Overview Performance Charts