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iSCSI Targets

The savings are even greater if you're planning for disaster recovery by linking storage from multiple locations. You can send iSCSI traffic across your WAN links--assuming you've got sufficient bandwidth--by just routing the traffic. In contrast, sending Fibre Channel traffic across a WAN would call for Fibre Channel to IP routers or switches, sending your cost well into five figures.

Because iSCSI uses standard Gigabit Ethernet, you may want to implement access controls so only authorized servers can access an iSCSI logical drive. Typically, iSCSI devices can limit access to logical drives by IP address, IQN (iSCSI qualified name) and/or CHAP (Challenge Handshake Authentication Protocol).

Of course, a SAN is nothing without storage, so you'll need to hook up a disk array or three. Since most vendors figure iSCSI customers are looking for more bang for the buck, today's iSCSI disk arrays use SATA (Serial Advanced Technology Attachment) drives to take advantage of their lower cost and higher capacity. Before you reject SATA as for server storage, take a look at how the disk-drive industry has changed in the past few years.

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