Hi,  i guess you confused SAN to NAS. You can make all cluster capacity available to your Server by using cifs (smb). you have no maximum limitations.  Keep in mind: to restrict the acces to this host only, you have to set the ACLs that way. You can limit the amount of "shared space" with SmartQuota. Server 2003 does only use smb1. if you want to write 250TB with smb1 you will need a lot of patience. Also i guess you will only utilize one connection to the isilon thus using only one network port  to do: (configure AD) create a share configure a accessrights on this share / the folderstructure which do only allow your server to connect there. "mount" have fun
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how is the limitation of share folder from Isilon to client ( windows cifs )