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Yes, as ZFS is quite memory hungry. Fact you will already be running the VM's and the two OSD proccesses on the RAM of each 3 servers id sugest trying to keep as much memory available for them two and not add any extra resource requirements. And I don't see how ZFS would add much extra useful...

Sorry I don't get what your question is there.

Not really possible, and with you limited bandwidth I'd not recomend any further replication. Just stick to local LVM / Raid.

I'd suggest 100% not to use ZFS and just use mdadm Raid 1 which can be setup using hetzner installimage.

No need :) donate to a local charity or something. If you need any help with the setup my Skype is in my profile feel free to fire me any questions glad to help as when I can.

Yeah no problems there, you can add disk from multiple storage pools/locations in Proxmox to the same VM.

Each 3 server cluster if you use 6 * 3TB disk will give you a 100% max full cluster size of raw 18TB and useable 6TB, however ideally id say keep it less than 4TB used, as CEPH should never be run near full.

That would help, would give you some protection against a single SSD failure (still backups are good for any files you really do care about), as long as the VM OS disk requirements can fit on 240GB along with 20-30GB for Proxmox and other OS files then the above 3 servers look fine.

Just making you aware, hopefully, your not expected that external 500mbps source to be from CEPH filesystem, as with the 1Gbps total you won't have the network for this. I would suggest hosting the VM OS on the SSD (with external backups due to single SSD) and only storing slower / larger files...

Then this will work, I am guessing you're be using their vSwitch? This will mean your CEPH network will be limited to 1Gbps, so don't expect crazy performance.

So to confirm you're looking at running CEPH on a single host with 2 OSD's? this is really not possible, as a min you want 3 OSD's for 3 way replication. But yes run Proxmox on the SSD and leave the two disks for OSD's, but your really better off just using one of their current lines that have...

CEPH shows free space worked out on the most full OSD's. As you can see from your OSD tree you have some in the high 70% / 80%, therefore, ceph df showing a used of 70%~ is correct. If your able to rebalance your OSDs better you would see your available space become slightly more, however...

So your be running Proxmox on a laptop? But anyway the license is per a socket your CPU is only one socket so you only require 1 license. Also just noticed your not the OP, you should be opening a separate topic or contacting the sales with your question and not jumping onto someone else topic :)

Do you want to know just VM -> Outside world or any traffic leaving the VM Interface even if locally?

LVM does support expanding an LVM over multiple disks (a bit like RAID0), however, if one disk fails you lose all the data not just 50%, as your be running VM disks onto of the LVM you're almost guaranteed a total data loss. Is the 6TB drive the only drive you have in the system or will you...

1) Yes as the storage never exists on any particular node, Proxmox will sync across the RAM and the VM will move across with only a small blip seen. The speed it takes depends on how much changes are being made to the ram. 3) It is possible however will make growing to extra nodes much harder in...

Is perfectly normal, and I would suggest its just part of a bot scanning IP ranges instead of targeting your specifically. You just need to make sure you have a strong password set and/or change to using SSH Cert based login and disable password auth all together.

Are you running VMs on the same hardware as CEPH OSD's? Are the VMs making use of CEPH RBD, are you using KRBD or LibRBD?

CEPH uses a very particular set of I/O when writing to disks, therefore certain non-enterprise drives will really suffer https://www.sebastien-han.fr/blog/2014/10/10/ceph-how-to-test-if-your-ssd-is-suitable-as-a-journal-device/ Is fairly old but will give you a good example of the large...

Are you connecting to the VM via the console in Promox or RDP? I think the console may be limiting the screen size, if you connect via RDP you should be able to access the full 1080p