Chapter 1.3. Switch interoperability
Page 10
10 SAN Volume Controller: Best Practices and Performance Guidelines This is a valid configuration, but you must take certain precautions: As stated in “ Accidentally accessing storage over ISLs” on page 8, zone and mask the SAN/ disks so that you do not access the disk arrays over the ISLs. This means your disk arrays will need connections to both switches. You must have two dedicated ISLs between the two switches on each SAN with no data traffic traveling over them. The reason for this design is because if this link ever becomes congested or lost, you might experience problems with your SVC cluster if there are also issues at the same time on the other SAN. If you can, set a 5% traffic threshold alert ...
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