Hello,
we run two (small) fat tree IB networks in our datacenter. Now we would like to merge the two into a single IB fabric - but we don't want to create a single fat tree. All we need is the bandwidth of 2-3 IB connections between the two fabrics. Is this possible?
Details:
Each existing fabric has two layer of switches: Two upper layer switches and 3-4 lower layer switches. Most clients connect to the lower layer switches. Some central fileserver connect to the top layer switches. We use Up/Down routing.
Can we just connect the top layer switches of each fabric to one upper layer switch on the on the other fabric - would this work with Up/Down or some other routing?
The two fabrics are not close and we weed fibre cabling between them, hence we would like to keep them independent fat tree topologies with just a few connections between to get access to storage local to each fabric.
Kind regards,
Heiner Billich