If you are talking about connecting Internet facing servers to the SAN, then good SAN security practices should be put in place, such as hard zoning, etc. Also, since Internet facing servers can be compromised, those servers should also be hardened and protected from viruses and attacks. If you want to connect NAS storage in the DMZ, using a separate storage device in that space would provide the best protection.
Dig Deeper on SAN technology and arrays
Related Q&A from Christopher Poelker
SAN expert Chris Poelker compares connecting a SAN with wavelength cabling and dark fiber and discusses the pros and cons of each. Continue Reading
SAN expert Chris Poelker discusses how to change the size of a LUN in a Microsoft cluster server environment. Continue Reading
Storage expert Chris Poelker outlines WWN basics in order to answer the question: "Why do HBAs in a SAN have same base?" Continue Reading