if you want your users to share files then go with NAS
If you want to create a playpen for each of your user to access then go iSCSI
iSCSI is block based and if you have multiple users accessing the same file, then changes made by user 1 will not be seen by user 2, unless you have filesharing software.
That is the way all iSCSI works.
If you need both then go with DSS, you can have both iSCSI and NAS volumes running at the same time. (like going both ways)
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