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Re: [Xen-users] Xen and iSCSI

To: Javier Guerra <javier@xxxxxxxxxxx>
Subject: Re: [Xen-users] Xen and iSCSI
From: Daniel Goertzen <goertzen@xxxxxxxx>
Date: Sat, 28 Jan 2006 14:45:49 -0600
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Javier Guerra wrote:

(snip) iSCSI is a complex protocol, and t needs a lot of help from the NIC to be competitive with other forms of SAN. that's why you see iSCSI cards from Adaptec and Intel. those cards look like regular SCSI hardware (i think the Adaptec cards might even use the same driver for SCSI and iSCSI)

There are dissenting opinions on this. Excerpt from http://en.wikipedia.org/wiki/ISCSI :

"In fact, in modern high-performance servers, a plain NIC with efficient network driver code can outperform a TOE card because fewer interrupts <http://en.wikipedia.org/wiki/Interrupt> and DMA <http://en.wikipedia.org/wiki/Direct_memory_access> memory transfers are required."


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