Probably. The thing about the ODA is the odd setup of the shared storage between the nodes. I can't remember exactly how it's exposed to the OS, but it's possible the internal storage is not really supported. You can't use ACFS or cloudfs for Splunk. So, can the internal disks be configured so at least one of the nodes can see them as one of the supported file systems listed here:
http://docs.splunk.com/Documentation/Splunk/7.1.2/Installation/Systemrequirements#Supported_file_systems ?
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