R&M Data Center Handbook
R&M Data Center Handbook
R&M Data Center Handbook
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www.datacenter.rdm.com<br />
Classic Structure<br />
The adjacent graphic shows an example<br />
of a classic server and storage<br />
structure in a data center with separate<br />
networks.<br />
Each server is connected physically to<br />
two networks, the LAN for communication<br />
and the SAN for storage<br />
media.<br />
LAN aggregation<br />
& core switch<br />
LAN<br />
access<br />
switch<br />
Ethernet<br />
This leads to an inefficient use of all<br />
available storage capacities, since<br />
each storage of an application is<br />
handled separately and its reserved<br />
resources must be made available.<br />
Server<br />
…..<br />
…..<br />
Servers are typically networked together<br />
via copper cables in the<br />
LAN/access area in the data center.<br />
Glass fibers are the future-proof cable<br />
of choice in the area of aggregation<br />
and cores.<br />
…..<br />
FC<br />
…..<br />
Fibre Channel is the typical application<br />
for data center storage.<br />
Storage<br />
…..<br />
…..<br />
FO<br />
Copper<br />
LAN aggregation<br />
& core switch<br />
LAN<br />
access<br />
switch<br />
Ethernet<br />
SAN Structure<br />
A network with SAN switches can<br />
greatly increase the efficiency of<br />
storage space in the network.<br />
<strong>Data</strong> can be brought together into<br />
fewer systems, which perform better<br />
and are better utilized.<br />
Server<br />
…..<br />
…..<br />
This behavior in the LAN, or more<br />
precisely SAN, is like that of the<br />
Internet, where storage space exists in<br />
a “cloud” whose actual locality is unimportant.<br />
FC SAN<br />
switch<br />
Virtual<br />
Storage<br />
FC<br />
Storage consolidation and storage<br />
virtualization are often terms that come<br />
up in this context.<br />
The advantage of Fibre Channel is that<br />
it optimizes the transfer of mass data,<br />
i.e. a block-oriented data transfer. This<br />
advantage over the Ethernet has led to<br />
Fibre Channel being the most<br />
commonly used transmission protocol<br />
in SANs.<br />
FO<br />
Copper<br />
Page 92 of 156 © 08/2011 Reichle & De-Massari AG R&M <strong>Data</strong> <strong>Center</strong> <strong>Handbook</strong> V2.0
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