Attach ISO share to 2nd datacenter

Hi,

We are running RHEV over 2 datacenters, we would like to attach the ISO share to the 2nd datacenter rather than have 2 shares (connectivity between sites is very good). However we are getting the following error:

"Create Operation failed. Domain ISOS already exists in the system"

Do we need a unique export path for each datacenter or a completely independant ISO share ?   Has anyone had any success with this ?

Many Thanks

Ian