Hyper-V cluster: Connections advice
I'm looking at virtualising our server rack, and seeing as we have an SAS SAN, using a failover cluster as well, all using current hardware. We are a split site school, fibre-optic joining the two sites, with one network / AD, approx. 3400 students and 450 staff.
Currently the SAN is connected to one of the x3550 M3 via both controllers for redundancy.
3 x IBM x3650 (2 NICs, 1 x E5430, 4GB)
2 x IBM x3550 M2 (2 NICs, 1 x E5540, 10GB)
1 x IBM x3550 M3 (2 NICs, 1 x E5620, 16GB)
1 x IBM x3550 M3 (2 NICs, 2 x E5620, 16GB)
1 x IBM DS3512 5TB SAN with dual controllers (4 SAS ports & 2 NICs per controller)
At a high level I'm thinking the following:
The cluster will contain the main DC (inc. DNS & DHCP), MS-SQL / application server, Print server, file server, SIMS server, SharePoint server.
2 x3650 as backup DCs (1 on each site)
1 x3650 with a 12TB NAS for backups (on the other site to the main server room)
4 node fail-over Hyper-V 2012 cluster on the 2 x3550 M2 and 2 x3550 M3
Anyway, I think the upgrades I need are as follows:
My questions are:
6 extra SAS controller cards and cables for the 3 x3550 not currently connected to the SAN
4 additional twin NIC modules for the 4 x3550 (to bring each one up to 4 NICs each)
More RAM to bring all x3550 to a minimum of 16GB
- How does the SAN connect to all 4 nodes? I think run 1 SAS cable from each node to each SAN controller (so 2 per node for redundancy)
- How does the SAN connect on the network? 1 NIC per controller is currently plugged in, but I haven't traced where they go yet
- How do the nodes wire up together for the cluster network / failover? I think each node will connect to each other node (3 NICs per node) or use a dedicated switch (1 NIC per node, or 2 teamed)
- How do the nodes connect to the main network? Here I'm thinking that the 4th NIC on each node connects to the main backbone / network switch (or 2 teamed if using a node switch for Q3)
How am I doing? Can anyone offer any advice on the above?
Although my investigation is into a 4 node cluster, I actually suspect a 2 node cluster would suffice, on the two x3550 M3, but if I can get the budget I may as well make it a 4 node. The IT budget here is a very strange affair, so it wouldn't be as though I could use the unspent money on another project. If the 'budget' isn't approved, then I will look to the 2 node cluster and possibly stretch to an additional E5620 CPU.
Many thanks for any comments!