08-05-2011 10:23 AM
This is a theoretical question so please bear with the simplicity since there are better ways to create a redundant dual switch topology.
Here is the scenario:
Hosts connect to Switch A.
Switch A connects to Switch B via one FC channel connection
Switch B connects to a storage device with one processor but two ports via two FC channel connections.
what can I do to increase the redunancy between Switch A and Switch B
08-05-2011 10:45 AM
1.) You can add an additional link (ISL) between A and B
2.) You create a trunk with two or more lines between the switches but this requires the trunking license on both switches. In addition all ports have to run on the same speed and on each switch the ports have to be on the same port group.
Best way is if all servers have two FC ports and you create a dual fabric design which provides best redundancy.
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If you need further information please let me know,
08-05-2011 12:31 PM
ISL = Inter Switch Link can be creat as a Single or DUAL ISL Connection called
Exchange Based Routing, aka Dynamic Path Selection
This is a Free feature by Brocade and work like the Trunking License methode, with the difference
- ISL Trunking send the date Frame in same dimension over TWO or more ISL Connection
- Exchange based routing send Data Frame first over ONE ISL, is this by 100% off the traffic switch to the Second ISL.
Pro and Contra for Exchange based routing vs. Trunking
+ LOW COST
- By difference of distance or difference of Speed, Example Read/Write to Disk or Read/Write to TAPE, Exchange Based Routing get a risk to collaps and the completed Tunnellig is blocked down.
08-05-2011 01:18 PM
If I decide to use the dual ISL link, how many paths will the host see? Also, where can I learn more about dual ISL links... Thanks a million for your insightful comments.
08-05-2011 08:54 PM
--->>>...how many paths will the host see?
your have to work with any MultiPath Software.
--->>>Also, where can I learn more about dual ISL links.
see attachment, this Guide describes general SAN Design.
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