A volume manager can present multiple SSD devices as one larger volume. Use the Automatic Storage Management (ASM) volume manager or other volume manager to concatenate multiple flash memory domains. For example, a volume manager can be used to concatenate four 1.6 TB domains into a single 6.4 TB volume.
Refer to the documentation for more information at http://docs.oracle.com/cd/B28359_01/server.111/b31107/asmcon.htm.