If you have not seen this, please review the technote below that discussed how to configure NAS devices using BE 12.5 DLO.
http://support.veritas.com/docs/310230
There has also been issues seen with NAS devices that cannot have Drive Letters assigned. Although not shown as supported, this is covered in the following Technote which provides a workaround to using these NAS devices with DLO;
support.veritas.com/docs/298956
Hope this helps.
Paul
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