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EMC Fibre Channel Storage System Model FC4700 Configuration Planning Guide
About Fibre Channel FC4700 Storage Systems and Storage Networks
Types of Storage-System Installations
You can use a storage system in any of several types of installation:
• Unshared direct with one server is the simplest and least costly.
• Shared-or-clustered direct, with a limit of two servers, lets two
servers share storage resources with high availability.
• Shared switched, with two switch fabrics, lets two to 15 servers
share the resources of several storage systems in a storage area
network (SAN). Shared switched installations are available in
high-availability versions (two HBAs per server) or with one
HBA per server. Shared switched storage systems can have
multiple paths to each SP, providing multipath I/O for dynamic
load sharing and greater throughput.
Figure 1-7 Types of Storage-System Installation
Storage systems for any shared installation require EMC Access
Logix
TM
software to control server access to the storage-system LUNs.
The Shared-or-clustered direct installation can be either shared (that
is, use Access Logix to control LUN access) or clustered (without
Access Logix, but with operating system cluster software controlling
LUN access), depending on the hardware model. FC4700 storage
systems are shared; they include Access Logix, which means the
servers need not use cluster software to control LUN access.
EMC1809
Unshared Direct
(one or two servers)
Shared or Clustered
Direct (two servers)
Shared Switched (multiple servers,
Multiple P
aths to SPs)
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SP A
SP B
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