Re: profiles - a way to simplify iSCSI

["Matt Wakeley" <matt_wakeley@agilent.com>]

Somesh Gupta wrote:

> > Mutliple
> > connections per session is there to take advantage of the 10GBE
> > link with the shortcomings of TCP,
> 
> How? By skipping around the congestion control algorithms? What
> about the other flows in the network?

Nobody said anything about skipping around congestion control.
TCP was not designed for the fast links that are available today, so
you'll probably need more than 1 connection to attain link rate.
Whether you have 1 or a thousand connections, congestion control
will still work (or else it's fundamentally broken anyway).

> > and markers are there to eliminate the cost of memory
> > subsystems required to buffer out of order TCP frames.
> 
> Framing has other benefit but not having a fast memory
> system cannot be avoided (especially if the inrastructure
> is to be common.) Also markers and CRCs do not mix well
> together.

How do they not mix well?

> > Eliminate
> > these, and
> > you've you'll capitulate to Fibre Channel for anything but slow storage
> > connects.
> 
> I don't think so. The pull of a common infrastructure will
> be too strong. And in case you have not looked lately,
> memory is getting fast enough and cheap enough. The GigaHz
> PCs are driving this.

Until memory becomes "free", iSCSI implementations will always cost more than
FC implementations that do not require memory

-Matt