On Jan 18, 2007, at 12:00 PM, Mark A. Carlson wrote:
I would imagine the argument is that of software drivers
for the storage stack consume much less overhead by
cutting out the IP part - less CPU consumed, perhaps
better throughput. As far as cost, it leverages the NIC
commodity pricing curve without requiring TCP offload.
The amount of CPU speed being consumed is really only valid for
underpowered machines. Any modern desktop has more then enough
horsepower to completely fill a 1GbE link with traffic at 4KB packet
sizes. If the storage array can't handle that level of network load
then an TOE is a viable solution since the price point of TOEs for a
big array would be acceptable. So, loosing the ability to route
packets and lack of security is bad enough, but there's an overlooked
fact that the ATAoE protocol still has to deal with packet loss and
retransmission. So, is the protocol overhead really that much less?
-- mark
Adam Leventhal wrote:
On Thu, Jan 18, 2007 at 03:13:51PM +0000, Darren J Moffat wrote:
As a security person one of the things that interests in
comparing ATA
over Ethernet with iSCSI is that with the later you get to use
IPsec to
provide transport layer security and that seems like a big plus
to me.
I think the idea of AoE is that you don't have IP, you're not
routable,
and you're necessarily on a dedicated network. Frankly, I don't
see the
utility over iSCSI.
Adam
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