SAN disk not visible in server if both the 8 gb brocade SAN switch are connected to C7000 Enclos

[pant44]

Hi,

We have two enclosure. both enclosures have two 8gb brocade SAN switch at interconnect Bay 3 & 4. We have configured these SAN switch in a Access Gateway Mode. Thease switches are connected to other CISCO SAN switch. Earlier these switches were working fine but suddenly in a day it happened that all the server that were in these enclosure lost its SAN disk. These SAN disks were not visible or offline in the servers. After some troubleshooting we found that both the enclosure are working fine (SAN disks are visible) if we connect only one Brocade SAN switch into enclosure particulary at Bay 4. every switch is working fine at interconnect Bay 4 but not in interconnect BAy 3. We can not say that the midplane is faulty becuase the issue occoured in two enclosure at the same time and hence less chances to be with the hardware midplane. So what could be the issue.. Is it with the configuration of the CISCO switch that is connected to our Brocade switch or something else?

[Johan Guldmyr]

Is bay 3 in each enclosure going to the same fabric?

Do I understand it correctly that if you have the servers up and running but only the brocade-switch in bay 4 connected all works, but if you put in the one in bay 3 things stop working? What if you only have the switches in bay 3 connected?

Some further details about what happens to the switches in module 3 would be useful. Logs from switches, error leds, are they seen at all from the cisco-side. Etc.

Some details about the SAN configuration would be useful - perhaps a picture.