I have the exact same issue on 5.0 U2. I am pretty sure it is a bug with SDRS clusters and I haven't found a way around it other than restarting the vCenter service. I have seen it several times and the latest was on a LUN that still had 630GB out of 800GB free on a VMAX 20K array. I have not had time to open a support case, but maybe someone with VMware will chime in and tell what is wrong.
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