Cluster and DRBD

[adamb]

Hey all! New to Proxmox.

I am currently working on setting up a production virtual environment for my place of work. The original plan was to use our native OS (CentOS6)+KVM until I came across proxmox. I was going to have 3 hosts and 1 backup host. The backup host is built to handle all the VM's of 2 hosts if they were to fail. I would like to stick with this plan but use DRBD. My question is, is it possible to setup DRBD on each host to replicate to a single backup server? I would prefer not to have a backup server for each host. I appreciate the input on the subject, I am also open to any ideas or suggestions on the subject. I look forward to hearing what the community has to say.

Thanks,
Adam

 

[adamb]

Doing some more reading it looks like I would need a raid volume for each individual VM.

 

[e100]

If you had three servers (A, B and C) you can setup one DRBD volume that replicates between A and B and another that replicates between B and C.

DRBD is a good solution for High Availability and works well with Proxmox.
You can find lots of info in the Proxmox wiki.

 

[udo]

Doing some more reading it looks like I would need a raid volume for each individual VM.

no!
much to complicated. Use an raid volume for the active VMs on each server.

Udo

 

[adamb]

no!
much to complicated. Use an raid volume for the active VMs on each server.

Udo

Ahh ok, so we would have 1 physical partition for the OS, 1 parition for the active VM's on the host, and 1 partition for the VM's being backed up. The 3 node cluster is this the typicaly setup most go with out of the box? I really appreciate the input!

Another question I have. As DRBD will be backing these up in real time. How do most of you handle reboots? 60% of our issues come after a reboot. We would like to take snapshot/backup after reboots for a weekly backup. This way if there are issues after a reboot we have a backup to fall on.