R&M Data Center Handbook
R&M Data Center Handbook
R&M Data Center Handbook
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www.datacenter.rdm.com<br />
New ToR switches sometimes support <strong>Data</strong> <strong>Center</strong> Bridging (DCB), and therefore Lossless Ethernet and<br />
Converged Enhanced Ethernet (CEE). The operation and significance of <strong>Data</strong> <strong>Center</strong> Bridging is explained in<br />
section 3.8.7.<br />
If one limits the ToR<br />
concept to LAN<br />
communication, the<br />
result is the cabling<br />
architecture shown on<br />
the right side, where the<br />
SAN and KVM<br />
connections are designned<br />
as in EoR<br />
architecture and an<br />
additional rack is therefore<br />
required to house<br />
them. Additional space<br />
for other servers is<br />
provided for this purpose<br />
in individual racks.<br />
........<br />
PATCH<br />
PATCH<br />
PATCH<br />
PATCH<br />
PATCH<br />
PATCH<br />
PATCH<br />
PATCH<br />
PATCH<br />
PATCH<br />
PATCH<br />
PATCH<br />
PATCH<br />
PATCH<br />
Aggregation<br />
& Core<br />
PATCH<br />
SAN<br />
The port assignment of<br />
SAN switches is optimized,<br />
which can mean<br />
that fewer SAN switches<br />
are needed.<br />
Application Server or Storage Library<br />
SAN Connection<br />
LAN Connection<br />
KVM Connection<br />
Redunancy<br />
Uplink<br />
SAN Switch<br />
LAN Switch<br />
KVM Switch<br />
The Cisco version, as<br />
also shown in the<br />
image on the right side,<br />
represents another<br />
example of a ToR<br />
architecture. LAN fabric<br />
extenders are used<br />
here in place of ToR<br />
switches and can also<br />
support Fibre Channel<br />
over Ethernet (FCoE) in<br />
addition to 10 gigabit<br />
Ethernet connectivity.<br />
By using these extenders<br />
of the Unified<br />
Computing System architecture<br />
(UCS), Cisco<br />
provides standardization<br />
in the LAN/SAN networks<br />
also known as<br />
I/O consolidation.<br />
........<br />
PATCH<br />
PATCH<br />
PATCH<br />
PATCH<br />
PATCH<br />
PATCH<br />
PATCH<br />
PATCH<br />
PATCH<br />
Application Server or Storage Library<br />
SAN Connection<br />
LAN Connection<br />
KVM Connection<br />
PATCH<br />
PATCH<br />
PATCH<br />
PATCH<br />
PATCH<br />
Uplink<br />
PATCH<br />
Aggregation<br />
& Core<br />
PATCH<br />
SAN<br />
LAN<br />
Fabric<br />
Extender<br />
SAN Switch<br />
LAN Switch<br />
KVM Switch<br />
Though these various ToR concepts appear to be different, they nevertheless have common features.<br />
Advantages:<br />
• Smaller cable volume (space savings in<br />
horizontal cabling and reduced installation<br />
costs)<br />
• Suitable for high server density (blade<br />
servers)<br />
• Easy to add additional servers<br />
Disadvantages:<br />
• No optimal assignment of LAN ports (no efficient use<br />
of all switch ports, possibly unnecessary additional<br />
switches)<br />
• Inflexible relation between Access and Aggregation,<br />
which leads to problems with increased server performance<br />
and aggregation of blade servers, as well as<br />
the introduction of 100 GbE<br />
>>> scalability, future-proof!<br />
R&M <strong>Data</strong> <strong>Center</strong> <strong>Handbook</strong> V2.0 © 08/2011 Reichle & De-Massari AG Page 59 of 156
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