Re: [Xen-users] Xen and iSCSI

[Daniel Goertzen <goertzen@xxxxxxxx>]

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."
Regards,
Dan.


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