You’ve really got two questions here. The first is if I like iSCSI for SQL, and the second is if I like NAS for SQL. NAS doesn’t support iSCSI as iSCSI is a SAN technology.
iSCSI is just fine for SQL Server as long as the server and the storage are on the same subnet, and the network has enough bandwidth available to support the data transfer.
NAS isn’t supported for SQL Server, unless the NAS has a SAN head and the SAN head is used for access to the storage.
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