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:

performance has deteriorated. I/O latency
increased from average value of 2888
microseconds to 168219 microseconds.

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.
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

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
Paul SolovyovskySenior IT AdvisorCommented:
I would use esxtop to figure out which process is causing IO issues

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
I would look at upgrading drivers and hardware for the host to HCL
Newly released Acronis True Image 2019

In announcing the release of the 15th Anniversary Edition of Acronis True Image 2019, the company revealed that its artificial intelligence-based anti-ransomware technology – stopped more than 200,000 ransomware attacks on 150,000 customers last year.

I would look at upgrading drivers and hardware for the host to HCL
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.
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
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today

From novice to tech pro — start learning today.