You will need to establish a SAN. If you are using the UltraStor units in a Fibre Channel configuration, you can add a switch, we would recommend QLogic SB 5600 Series and MetaSAN from Tiger Technology. Using the MetaSAN client software you can manage and share out the storage between your Axio systems pretty easily. If the UltraStors are SCSI attached units you can purchase an Atto Fibre Channel-to-SCSI Bridge 4Gb FC and dual UltraSCSI connections and share out the storage by attaching to the QLogic SAN switch.
If you have questions or we can be of additional help, plesae get in touch.