The following table 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. Metrics introduced in ESXi 5.0 are not available for hosts running earlier versions; "No data available" will be displayed when users attempt to view new metrics on older hosts.

Table 1. 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."