Majority of my datastores disk space issues incorrectly

Hi Guys,

I am using isilon storage and most of my datastores are reporting the following errors:

0 days of usable Disk Space Usage capacity remaining

is Over VM Capacity by 14 VMs because of Disk I/O

The above errors are being reported even though I have close to 600TB of free space on these datastores.  So this is definitely a false alarm, but I can't seem to figure out what is causing this problem.  Has anyone run into similar issues?  Any recommendations on what I should be checking for?

Also, I am running the most recent 5.7.0 release and all my esx hosts are running 5.1.

Thanks,

-Simran