VMware storage shows exclamation point

I have 2 of my NFS volumes showing a yellow exclamation mark (bang) under the configuration storage section. This is on my new vmware 5.5 vcenter box. My old vcenter box, is connected to the same storage with no show of a bang. Any ideas? 7 are fine on the new one, but two show the bang. Space is fine, it's accessible. Rebooting hosts does nothing.
cajxAsked:
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Andrew Hancock (VMware vExpert / EE Fellow)VMware and Virtualization ConsultantCommented:
Could you upload a screenshot of the error?

The storage drivers/APIs in ESXi 5.5 have been updated.

If you connect directly to the ESXi 5.5 hosts, do you still have the yellow warning?

What sizes are the NFS datastores? are there many VMs present?

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compdigit44Commented:
What hardware / storage are you using for the NFS volumes? Is it listed on the ESXi5.5 / vCenter HCL?
cajxAuthor Commented:
As it turned out, our storage was over 75% usage... so the default alarm was triggered on those two volumes. The older vcenter must have had the error ages ago and was acknowledged then cleared, and so we didnt see the error anymore.
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