Hi guys, I was wondering if someone experienced would be kind to share their opinion on folowing subject - since I'm 95% clear with design/ho stuff works, but again missing some info - after I have done my RTFM many times, and I had also check in details ShapeBlue's diagrams on Networking Deep Dive etc.
Subject: Management vs Secondary Storage connectivity dependencies Current setup: - We start with 1 POD, 1 Cluster - All KVM hosts are directly attached to mgmt, primary storage, and secondary storage networks/vlans (via 3 dedicated NICs/vlans - each one on a separate/non-overlapping /16 network), so no rouing required for any KVM host to reach any resource on all of these 3 networks... - Zone-wide Primary Storage (CEPH) - again, directly attached to all KVM hosts - this means all future PODs will be also directly attached to CEPH/Primary Storage Net - no routing... - NFS Zone-Wide Secondary Storage (of course) For Primary Storage traffic/network I dont have any questions - I understand how stuff works (thx for latest docs and ShapeBlue blogs) - except possible zone-wide vs cluster-wide discussion... Questions that I have - Secondary Storage network...: 1. Since all KVM hosts are directly attached (via dedicated interface) to both MGMT and SEC storage network - is there any routing that needs to be done on the L3 switch ? My understanding not, but some confirmation would be nice please. 2. What about when we have multiple PODs/Clusters - does it make any difference versus 1 single POD/Cluster? I understand there needs to be routing connectivity over L3 switch between different Management networks of each POD, but what about storage? I expect I would need to attach/trunk Secondary Storage Net to all KVM hosts in all PODs... ? 3. What other networks (except MGMT) does Management server needs to be connected to ? I understand there needs to be eather routed or dirrect (dedicated NIC) connection to Secondary Storage network - at least during ACS deployment, during sys template preseed on NFS ? 4. Is Secondary Storage network required for anything else on MGMT servers, after the ACS template preseed/provisioning ? I understand not, but again would benefit some confirmation please. 5. Finally - in terms of pure ACS aspect - is there a difference between KVM hosts being connected directly to Secondary Stor Net (via dedicated NIC/trunked) or using routing - in other words, can we say that something like folowing is true: If the KVM host doesnt have direct attached network to it self (primary, secondary) = it will used Management Net gateway to try to reach its destination (Pimary/Secondary storage for example) meaning it will use routing for this. 6. What is really Secondary Storage Network Gateway used for in ACS ? I apologize for having long questions - I just try to understand connectivity dependencies between Sec and Mgmt networks and will be really thankfull for clarifying these... Regards, -- Andrija Panić
