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Are there any reasons to migrate from NAS to iSCSI?

What are the reasons to migrate from NAS to iSCSI? Are there applications that run on iSCSI that can't be used in NAS?
I don't see any reason to migrate from a NAS environment to iSCSI. There are some applications that block I/O directly or that do not support having a NAS attachment (these are few and far between), in which case you can use iSCSI to provide the block I/O. NAS does file I/O using a remote file system, while block I/O is typically done using SCSI commands over Fibre Channel or encapsulated with TCP/IP over Ethernet (iSCSI). You'll need to look at this on an application by application basis.

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