There used to be 4 switch modules in Blade Center H chassi: bays 1,2,7,9. Everything worked fine.
Then we installed two more modules in bays 3 and 4. After that we start observing an issue: modules 7 and 9 continue working but lost management ip address connectivity. Modules 3 and 4 are in "no fabric" status, but reachable via mgmt ip address. Switches configuration are identical. No changes in Blade center configuration have been performed.
Then we tried to replace module 3 with module 7. Issue was the same. Bay 3 - "no fabric", Bay 7 - no mgmt reachability
I'd really appreciate any ideas where to look