We have 3 hosts. From 2 hosts i can see the datastore and browse it from the vSphere client or via ssh. On the other host, the one that hosted the VM, i can't see the datastore but i can see the device. When i use vmotion to transfer the VM to a different host, it's also not starting there.
I did a ssh connection to one host that sees the datastore, went into the folder and did a "touch icg4aida-flat.vmdk". That also gives a i/o error. I'm already thinking about deleting the LUN on the storage, remove it from vSphere, create a new LUN, add a new datastore with vSphere and use the backup for the data.