I have two SANs (Dell Equallogic PS6100E, though not necessarily an eql. question). I have a NAS that connects to them (FS7600). That NAS is on the regular network lan, but has it's storage on the SAN.
I can make the SANs one giant NAS reserve (Dell parlance), so that my entire SAN is NAS space, assuming I made one giant array/member to begin with. This means no separate pool or members separate from the big reserve.
Why might I want to provision block iSCSI targets? All the file systems are the same, the RAID configs will always be the same and so on. Are there special applications where iSCSI applies; even homogeneous OS and file systems? When might I require iSCSI?