03-30-2007 01:20 PM
Our SAN was originally designed as a two switch fabric in a two room environment on a manufacturing campus. We have added IBM blade centers with a Brocade 4020 switch and have added that switch to the fabric via one connection from the 4020 to one the local switch.
03-31-2007 03:08 AM
Stuart, i am not sure if i understand wath you mean:If yes, you can connect the SW4020 trough ISL with a External Switch to create a Fabric, but this not will create any Failover, because the SW4020 connectivity with the Blade's Server / HBA is only available trough the Backplane. To Create a Failover beetwen the Blade Center you must insert 2x "TWO" SW4020. I hope this help, otherview explain here the Config.
06-13-2007 12:02 AM
for having redundancy with the switches you are correct.the most common approach would be to have all switches redundant (2x4020, 2x3800) and set them up in a dual fabric design (4020_1 and 3800_1 in one fabric and 4020_2 and 3800_2 as seperate fabric)