Linus Torvalds wrote:
On Mon, 4 Feb 2008, Matt Mackall wrote:
But ATAoE is boring because it's not IP. Which means no routing,
firewalls, tunnels, congestion control, etc.
The thing is, that's often an advantage. Not just for performance.
NBD and iSCSI (for all its hideous growths) can take advantage of these
things.
.. and all this could equally well be done by a simple bridging protocol
(completely independently of any AoE code).
The thing is, iSCSI does things at the wrong level. It *forces* people to
use the complex protocols, when it's a known that a lot of people don't
want it.
Which is why these AoE and FCoE things keep popping up.
It's easy to bridge ethernet and add a new layer on top of AoE if you need
it. In comparison, it's *impossible* to remove an unnecessary layer from
iSCSI.
This is why "simple and low-level is good". It's always possible to build
on top of low-level protocols, while it's generally never possible to
simplify overly complex ones.
Never discount "easy" and "just works", which is what IP (and TCP) gives
you...
Sure you can use a bridging protocol and all that jazz, but I wager, to
a network admin yet-another-IP-application is easier to evaluate, deploy
and manage on existing networks.
Jeff
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