RE: [Xen-users] xen and SAN.

[Jeff Sturm <jeff.sturm@xxxxxxxxxx>]

> -----Original Message-----
> From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx [mailto:xen-users-
> bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of John Madden
> Sent: Monday, September 21, 2009 2:17 PM
> To: William
> Cc: xen-users; Mauro
> Subject: Re: [Xen-users] xen and SAN.
> 
> > What is the best solution : ISCSI (1Gb/s) or Fibre Channel (4Gb/s)?
> 
> That depends on your needs.  I'm personally skittish about passing
disk
> blocks over ethernet and prefer FC, but it's expensive and if you
> believe [some of] the pundits, everything is going to ethernet
> eventually anyway.  I think it's still safe to say though that at this
> time, if you need really reliable disk at theoretically-higher
> performance and you can afford it, go with FC.

FC is actually easier to justify in virtualized environments where the
cost factors are less and the need for performance greater.

Compare the costs of an HBA and switch fabric for 15 small physical
hosts vs. 3 big dom0 hosts.  Ethernet may never outperform FC; it's main
selling point is that it is cheaper and simpler to implement.

-Jeff



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