I'm working on NFSv4+KRB and came across the NetApp simulator. It's pretty easy to setup, and allows for dorking around with almost everything (clustering, iscsi, snapmirror, ...). It's helpful for someone like me who a.) first needs to get acquainted with managing a netapp filler without breaking anything, and b.) wants to test filer kerberos configuration. (Ultimately I'll need a physical filer for further performance and stability testing, but it's a handy start.)
To read about what the simulator is, what it's limitations, strenghts, and requirements are, check out this: http://www.unitek.com/training/netapp/blog/2008/05/strengths-and-weaknesses-of-your-netapp-simulator/
Other useful links:
Download Simulator: (NOW account required)
http://now.netapp.com/NOW/cgi-bin/simulator
A tutorial series on using the Netapp Simulator:
http://www.unitek.com/training/netapp/blog/category/uncategorized/page/2/
Netapp Simulator 7.3 -- Installing the Simulator
http://tendam.files.wordpress.com/2008/12/simulator7_3.pdf
Netapp Simulator Forum:
http://communities.netapp.com/community/technet/interfaces_and_tools/simulator?view=discussions
Useful Netapp Commands:
http://unixfoo.blogspot.com/2007/10/untitled.html
Netapp Snapvault guide:
http://www.geekyfacts.com/index.php?option=com_content&view=article&id=64:snapvault&catid=38:netapp&Itemid=58
Netapp ONTAP SDK:
http://communities.netapp.com/docs/DOC-1110
Netapp Technical Reports:
http://www.netapp.com/us/library/technical-reports/15619132.html?&letter=&sortBy=partNumber&pageSize=400
Learning Oracle RAC with the NetApp Simulator:
http://www.oracle.com/technology/pub/articles/garg-netapp-simulator.html