Why all tape devices are not getting listed in RHEL 6?

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Issue

NetApp VTL ( virtual tape device ) attached via FC HBA to a RHEL 6.3 server running on an HP BL460c blade. The VTL has 40 virtual tape devices, but only the first 7 show up as valid tape devices. Why?
The VTL has 40 virtual tape devices, but only the first 7 show up as valid tape devices. Why all tape devices are not getting listed in RHEL 6 server?

Environment

Red Hat Enterprise Linux (RHEL) 6

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