ESX 4.x losing statistics

Just noticed some weird behaviour on ESXi 4.1 U1 (build 348481) statistics while rescanning datastores. Wanted to share my findings and maybe also find an explanation or a fix for this problem.

I started “rescan for datastores” on a cluster that has two ESXi’s in it and noticed that while the scan was on the realtime statistics wasn’t showing any graph. Same issue with both hosts when using Virtual Center and also when connected directly to the ESXi. Also no graph on VM’s during the rescan. I did some tests with ESX/ESXi 4.1 (build 260247) using different storages and got the problem reproduced on those too.

Gaps on the graph while rescanning:

I also noticed that all of ESXi’s CPU was consumed during the rescan.

During the scan:

After the scan:

One host was showing zero CPU usage while rescanning:

Don’t know if this is a bug or what but I hope I can find a fix for this soon.

Has anyone seen this happen before?

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