R&M Data Center Handbook
R&M Data Center Handbook
R&M Data Center Handbook
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www.datacenter.rdm.com<br />
3.7.2. Converged Networks, Effect on Cabling<br />
Classic LANs and SANs use different transmission protocols,<br />
typically Ethernet for LAN and Fibre Channel for<br />
SAN.<br />
LAN aggregation<br />
& core switch<br />
However, LANs, as communication networks and SANs<br />
as storage networks are merging (converging) more and<br />
more.<br />
Current transmission protocols under continuous development<br />
support this standardization and are paving the<br />
way for a structure with FCoE, Fibre Channel over<br />
Ethernet.<br />
LAN<br />
access<br />
switch<br />
Ethernet<br />
Ethernet<br />
FC<br />
FC<br />
FC SAN<br />
switch<br />
The following 3-Stage Migration Path per the Fibre<br />
Channel Industry Association (FCIA: www.fibrechannel.org)<br />
is presented below. This process is based on hardware<br />
reusability and the life cycles of the individual components.<br />
Server<br />
FO<br />
Copper<br />
FC Storage<br />
Stage 1<br />
The introduction of a new switch, a so-called<br />
Converged Network Switch, allows existing hardware<br />
to be reused.<br />
LAN aggregation<br />
& core switch<br />
Ethernet<br />
It is recommended in smaller data centers that<br />
storage systems be directly connected via this<br />
Converged Switch. A dedicated SAN switch would<br />
be required in larger structures so as to avoid<br />
bottlenecks. Converged Adapters are required for<br />
the server connection.<br />
10G converged<br />
network switch<br />
FCoE<br />
FC<br />
FC<br />
FC<br />
FC SAN<br />
switch<br />
FCIA recommends SFP+ as its transceiver interface<br />
of choice (fiber optic & copper). Since a<br />
copper solution is possible only over 10 meters<br />
using Twinax cables, fiber optic cables must<br />
replace copper ones in these “converging” networks.<br />
Stage 2 Stage 3<br />
Server<br />
FO<br />
SFP+: Twinax or FO<br />
FC Storage<br />
The Converged Switch is upgraded with an FCoE<br />
uplink in a second migration stage and connected<br />
to FCoE in the backbone.<br />
LAN aggregation<br />
& core switch<br />
The final FCoE solution is connected directly to the<br />
core network. FC as an independent protocol has disappeared<br />
from the network.<br />
LAN aggregation<br />
& core switch<br />
10G LAN<br />
access switch<br />
FCoE<br />
FCoE<br />
FCoE<br />
SAN<br />
switch<br />
10G LAN<br />
access switch<br />
FCoE<br />
FCoE<br />
FCoE<br />
FC<br />
FCoE<br />
Server<br />
FC Storage<br />
Server<br />
FCoE Storage<br />
FO<br />
Copper<br />
FO<br />
Copper<br />
R&M <strong>Data</strong> <strong>Center</strong> <strong>Handbook</strong> V2.0 © 08/2011 Reichle & De-Massari AG Page 93 of 156
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