NAS is similar to an iSCSI storage system in that existing Ethernet ports on servers can be used on existing network...
switches. Where the economics start to change -- and where you need to look beyond networking and connectivity costs -- is when you consider management tools and associated software costs, in conjunction with performance requirements. Consider other costs involved with making storage easier to manage and enabling data protection including backup, snapshots, replication, and volume management and provisioning tools as part of your comparisons between different storage networking interfaces, protocols, and access methods.
Dig Deeper on Storage Area Network (SAN)
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