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The search function on this forum is handy. https://forum.proxmox.com/threads/cant-backup-ct-cannot-stat-structure-needs-cleaning.31426/

Did you see this? https://forum.proxmox.com/threads/pve-pvestatd-could-not-activate-storage-zfs-error-import-by-numeric-id-instead.34655/

1. Fine, though the ZFS option is good too. 2. It will increase your performance. 3. Check under each node->Networking. It has the ability to create many different types of networks. 4. Proxmox has built-in backup capability that works very well. You just need to verify the backup storage...

Turn off KVM Hardware Virtualization on your VM options.

Just for reference, I have this installed on my Win 7 client. VirtViewer 0.5.7 SPICE Guest Tools 0.132

Do you have Spice as your video configuration?

They are trying to tell you that 2 node HA is not supported with Proxmox now.

Yeah, different kernels.

You can try some of the ideas here for a cheaper 3rd node. Note what was was written by t.lamprecht https://forum.proxmox.com/threads/two-node-high-availability-cluster-on-proxmox-4-x.23828/

What does this show? zpool status -v

Please make sure you verify your backups of all VM's. You do not want any checksum errors after the fact due to bad backup storage. Example: https://forum.proxmox.com/threads/very-serious-backup-restore-issue-in-pve-5-0.37520/ Very detailed procedure...

You are going to want 3 nodes at each datacenter.

No, the names could be something like this: pve1.local pve2.local pve3.local

You have the same hostname on all the nodes. Try something like pve1, pve2, pve3, etc. https://forum.proxmox.com/threads/proxmox-node-name-change.14327/

Well, the mirror would contain your guest hard drive images. Just make sure you have a copy of the guest configuration files and you should be fine.

Just set up a test environment and check it out. The instructions: http://docs.ceph.com/docs/master/rbd/rbd-mirroring/

Just like Alwin wrote, use either Ceph or ZFS; do not mix them. There is no need. I have no idea how ZFS is related to Bluestore/Filestore in regards to Arnaudd's post. Twilight Zone. Bluestore has its own filesystem and Filestore uses XFS.

Did you see this? https://forum.proxmox.com/threads/ceph-erasure-coded-pools-planned.34251/

For starters, the contents of your /etc/hosts file.

You mentioned that the backups were sent over NFS. What was the storage on that end?