ESXi High i/o latency

I am running ESXi 5.1.0 - 1065491 with locallly attached storage.

I am getting spikes of high I/O and I get this error in the event logs:


Device
naa.600508b1001030364537433144300a00
performance has deteriorated. I/O latency
increased from average value of 2888
microseconds to 168219 microseconds.
warning

We recently upgrade from ESX 4.0 to ESXi 5.1U1. Where should i be checking to find the culprit for the high IO?

Also I have to try multiple time to login through vsphere, i get the error cannot connect then magically I can authenticate and login.
AllanoreAsked:
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Nick RhodeIT DirectorCommented:
How frequent is the latency, what type of hardware (raid controller and hard drive speeds).  I know its recommended to have a controller with a write cache to prevent the latency and decent hard drives to support the read/write
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Paul SolovyovskySenior IT AdvisorCommented:
I would use esxtop to figure out which process is causing IO issues

http://theithollow.com/2012/07/using-esxtop-and-resxtop-to-obtain-performance-metrics/
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dipopoCommented:
I would look at upgrading drivers and hardware for the host to HCL

http://www.vmware.com/resources/compatibility/search.php?deviceCategory=io
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dipopoCommented:
I would look at upgrading drivers and hardware for the host to HCL

http://www.vmware.com/resources/compatibility/search.php?deviceCategory=io
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Nick RhodeIT DirectorCommented:
Is the server still under warranty?  I had this issue on my Dell server and support pulled logs and told me what would resolve the issue and what is causing it.  You might be able to get some pro support to assist if necessary.
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Completely normal for slow storage.

What storage are you using, RAID type, disk type etc
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