Daylight savings changes this weekend allow many folks to get an extra hour of sleep.  However, a VMware vSphere 4.1 bug has surfaced which may spoil the fun. 

VMware has published KB 1030305 (Performance charts fail after Daylight Savings changes are applied) which serves as a reminder that the pitfalls and treachery of mixing daylight savings changes and million dollar datacenters are not behind us yet.  Those who are on vSphere 4.1 and observe the weekend time change will run into problems come Sunday morning:

After Daylight Savings settings are applied:

• Performance charts do not display data
• Past week, month, and year performance overview charts are not displayed
• Datastore performance/space data charts are not displayed
• You receive the error: The chart could not be loaded
• This occurs when clocks are set back 1 hour from Daylight Savings Time to Standard Time

VMware offers the following workaround:

Use Advanced Chart Options:

1. Click Performance
2. Click Advanced
3. Click Chart Options and then choose the chart you want to review

Use a custom time range when viewing performance charts after clocks are set back:

1. Click Performance
2. Click the Time Range dropdown
3. Choose Custom
4. Specify From and To options that exclude the hours for when the time change occurred

For example:

If Standard Time settings were applied on November 7, at 01:00 AM, you could use these ranges:
Before the time change:
From 1/11/2010 12:00 AM To 7/11/2010 12:00 AM
After the time change:
From 7/11/2010 03:00 AM To 8/11/2010 15:00 PM

Have a great weekend!

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