Ethernet: The Datacenter's Unifying Foundation
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Susan Fogarty
Susan Fogarty,
User Rank: Author
1/2/2014 | 12:57:20 PM
Ethernet everywhere
Patrick, thanks for all of this information about Ethernet and its development. I'm sure Bob Metcalfe never imagined it would become so important to so many people! Are there any additional technologies or applications you predict will begin using Ethernet that have not traditionally been transported over the protocol in the past?
Lorna Garey
Lorna Garey,
User Rank: Author
1/2/2014 | 4:30:57 PM
Skip 40?
Do you see datacenter engineers jumping direct from 10Mbps Ethernet to 100 Mbps, skipping 40? Seems like the price delta is small enough that it will make sense in some instances.
User Rank: Apprentice
1/6/2014 | 1:12:05 PM
Two versions of RDMA over Ethenet: iWARP and RoCE
Patrick, very nice overview!  I know you were trying to be concise, but if you mention the capability of running Remote Data Memory Access (RDMA) protocols over Ethernet, you should note there are two software-compatible, but competing technologies that offer that capability, iWARP and RoCE.  Both are in production today.  In a nutshell, iWARP is built on top of TCP/IP and is thus inherently routable.  RoCE uses an InfiniBand transport over an Ethernet wire.  It cannot take advantage of TCP/IP capabilities like congestion management and in its current incarnation is resticted to an an L2 subnet in a singe data center, i.e., not routable.  There is no inherent reason in the protocols why either should have a significant performance advantage over the other.

David Fair, Intel
User Rank: Apprentice
1/7/2014 | 10:59:14 AM
Re: Two versions of RDMA over Ethenet: iWARP and RoCE
Thank you David. I did not intend to leave one out in favor of the other and appreciate you filling in the gaps on them both for us!

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