Open Stack

Hello all,

We are going to deploy Openstack cloud with researchers as primary 
target users. We will have around 100 GPUs with 12-15 servers with 
Infiniband interconnect. We still do not know the exact spec of servers 
nor GPUs but mostly we will have A100s and Intel Xeon processors. What 
sort of RAM and Storage requirements we need for a cluster of this size? 
Of course, this depends a lot on use cases and this cloud will be 
primarily used for HPC and AI. For the storage, we are mainly interested 
in the block storage requirements for provisioning VMs. We will most 
probably have a shared parallel file system as scratch and project spaces.

Is there any rule of thumb to get to the RAM and storage requirement 
numbers based on compute infrastructure we will have? If we can estimate 
a sort of "lower bound" that would be really helpful for us. If anyone 
have clusters of this size at your organizations and if you can share 
the RAM ans storage details of your clouds, that would be very useful 
for us too.

Thanks a lot and have a great day!!

Regards

Mahendra