NetApp FAS
While most large-storage systems are implemented with commodity computers with an operating system such as Microsoft Windows Server , VxWorks or tuned Linux , ONTAP-based hardware appliances use highly customized hardware and the proprietary Data ONTAP operating system with WAFL file system , all originally designed by NetApp founders David Hitz and James Lau specifically for storage-serving purposes . 
<triplet> Microsoft Windows Server <subj> operating system <obj> instance of <triplet> VxWorks <subj> operating system <obj> instance of <triplet> Data ONTAP <subj> operating system <obj> instance of <triplet> WAFL <subj> proprietary <obj> instance of