If you see Hosts that are booting off of usb on 7.0u2 that go Non-Responsive, or where vmotion doesn’t work or they just generally lock up, then updated them to the latest 7.0 release. According to https://kb.vmware.com/s/article/83963 a race condition causes this behavior and was fixed in 7.0U2c
This can also be seen when log listing /vmfs/volumes on an ssh session:
To temporarily fix this issue reboot the host.
Andy's Brain 