I don't have the numbers to back up any kind of %CPU comparison,
but it would be interesting to have that data...
The argument around %CPU is mainly license cost. For example if
you have an Oracle license for that CPU, consuming any % of its
cycles costs you that fraction of the Oracle license in effect.
This is the argument that FC vendors, for example, use against
software based iSCSI and justify the cost of the HBA over a NIC.
-- mark
Rick McNeal wrote:
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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Rick McNeal
"If ignorance is bliss, this lesson would appear to be a
deliberate attempt on your part to deprive me of happiness, the pursuit
of which is my unalienable right according to the Declaration of
Independence. I therefore
assert my patriotic prerogative not to know this material. I'll be out on the playground."
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