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What's good about iSCSI?

I have very limited knowledge and experience with external storage solutions. All my experience is to setup NAS devices. I do not know SAN or things like that.

Recently we will need to purchase one more Buffalo TeraStation III, I see they have an iSCSI version of TeraStation III, and it is not much more expensive at all. Who would be able to explain to me in plain language regarding the following questions?
1. What is good about iSCSI? Why I should use iSCSI as opposed to a NAS?
2. Does iSCSI have to be "attached" to a server? If so, we have a Dell PE2900, would this server work with iSCSI?

Thanks in advance
jack
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SterlingMcClung

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Thanks. but what is " iSCSI initators"? I saw it in the bios of Dell T610
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Thanks. but what is " iSCSI initators"? I saw it in the bios of Dell T610

iSCSI initiators can be implemented either in hardware or software.  I cannot specifically say for the Del model in question but it would then seem that the server would be able to connect to the iSCSI target even before the OS loads.  In the way the OS would not even know about iSCSI.  As far as the OS will be concerned, there will be harddrives it can use, and it would be oblivious of the fact of whether the drives are directly attached or iSCSI attached.
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Thank you all!!
I got a much better picture of iSCSI now.
Jack