Should HA be configured before all else?

[kai_f]

Can I configure my 4 node cluster into HA, test it first, and then install Ceph later? Or should these be considered in configuration together from the beginning?

Are 4 subnets enough to separate sync and ceph traffic from VM / Server traffic?

ie.
Corosync
VM / Server Traffic
Ceph Sync
Management

I'd like some example network diagrams / help with design if possible.

Thanks

 

[Dominic]

Can I configure my 4 node cluster into HA, test it first, and then install Ceph later?

You should have some shared storage to set up actual HA?

Are 4 subnets enough to separate sync and ceph traffic from VM / Server traffic?

Only you can decide what "enough" is. If this is a low traffic test cluster then you can also use a single network. Often the main consideration is that your storage traffic must not block packages that require low latency like from Corosync. In this case separating the networks is useful.

 

[kai_f]

I'll set up Ceph first and then a test HA cluster. I guess i'll be back later for help on separating the network / configuring my NICs from proxmox (every node has both a GigE and 10Gig NIC with 2 ports) thanks!