High-Availability Example - EMC Connectrix EC-1200 Planning Manual

How to Design a Solution
A
Connectrix v6.02 Planning Guide
A-4
Sun Server
with
PowerPath
HBA-A
HBA-B

High-Availability Example

Figure A-2
In a consolidation topology, the storage links are spread evenly across
port cards. This minimizes the impact of interruption if a port card
needs to be replaced. For example, if a physical topology is composed
of sixteen servers and four Symmetrix links, and the logical topology
is four 4:1 fan-outs, the four storage links should not be connected
into one port card. Repair of this port card would interrupt all I/O
access in an environment without PowerPath, and would significantly
degrade bandwidth in an environment with PowerPath.
An example of spreading the storage links across port cards without
PowerPath is developed in Appendix B.
Connectrix Director
Port Card Port Card
1 10
Port Card Port Card
2 11
Symmetrix
FA-1A
FA-5A