Linux KVM and EqualLogic

I was wondering if anyone could help me with an issue with KVM and ISCSI. 

If we restart a controller on our EqualLogic SAN or there are any network interruptions on the storage network (e.g. we move a member out of the pool)

, KVM guests throw a wobbler and their files systems go into read only(centos 5.9 guest with virtio driver).

I have read a few forums that indicate you can set disk timeout values on the guests themselves but this is not possible using the virtio driver, which is what we are currently using.

Is there any way we can instruct KVM to pause the vm's ,if there is a storage failure and resume them when the storage comes back online (I think vmware does this) ?

We are currently running Centos 6.4. There seems to be a werror='stop' and rerror='stop' options to achieve this but if I try to put these in options in the libvirt xml file for a vm, libvirt appears to be removing them.

Thanks