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Here's our scenario:

Site 1 has 3 hosts, and our vCenter server is here.

Site 2 has 3 hosts.

All hosts are ESXi 4.1 update 1.

If I view the Performance tab for any host in Site 1, I can view realtime, 1 Day, etc., i.e. all the views give me graph data.

For the hosts in Site 2, I can view the realtime graphs, 1 Day and 1 Week both say "No data available". 1 Month had mostly nothing, 1 Year shows that it was working fine for a long time and then started breaking.

1 Month view:

1 Month view

1 Year view:

1 Year view

What would cause this loss of performance data?

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3 Answers

up vote 2 down vote accepted

I see this very often, basically it's lack of data collection; could be anything, could be the VC was down/busy, the host/s were down/busy, link loss etc. Essentially data collection is a very low priority thing from a VMWare perspective and it handles lost data well so I see the same thing all the time. Sorry this doesn't actually fix anything.

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That explains it to a degree, but overnight the usage on the hosts and the WAN link drops to nearly nothing, I can't imagine that its collecting nothing at all overnight as well. :-/ –  ThatGraemeGuy Jul 21 '11 at 11:12
    
Ok, maybe setup a ping-loop>file at the same time, see if you get link drop-outs, then maybe a perfmon log on the VC? –  Chopper3 Jul 21 '11 at 11:23
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Connectivity issues between Site 1 and Site 2? –  joeqwerty Jul 21 '11 at 11:24
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Here are 2 VMware KB articles that discuss possible issues and solutions related to missing performance data:

http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1030819

http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=2009532

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While this may answer the question, we prefer to avoid link-only answers here, as links change and break over time. Please include at least a summary, or the most important parts of the information at the links in your post. –  HopelessN00b Oct 11 '12 at 5:46
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If the issue is intermittent, it can normally be resolved by the restarting the vCenter Server. However, there are a number of other issues that could be related specifically if there are issues on the SQL, in vCenter, or if an upgrade of vCenter was recently done. These points are well documented in the VMware Support Knowledge Base and release notes.

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