As far as I know, still it is not possible to have 2x WIndows 2008 servers in cluster plus 2x iSCSI Open-E storages in iSCSI failover.
ONE Windows 2008 plus 2x iSCSI Open-E storages in iSCSI failover is possible.
Someone from Open-E said that for now, iSCSI failover (2x DSS storages) is working in mode "Active-Passive".
But Windows 2008 cluster needs iSCSI failover (2x DSS storages) to work in mode "Active-Active"
Known issue from Open-E:
When using DSS V6 in windows 2008 cluster environment a failover event on DSS V6 will break i/o operation performed on the DSS V6 iSCSI target e.g. copying of files