[ovirt-users] Disaster recovery active-active question

Hi, On the active-active DR, in the documentation it is said : "You require replicated storage that is writeable on both sites to allow virtual machines to migrate between sites and continue running on the site’s storage." I know that it's not a direct oVirt question, but if someone has implemented this ... Which type of storage that can offer both real time synchronization and read/write on both ends on the replicated volumes? Regards.