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If you are using zfs it also by default uses up to 50% memory. Search for ARC limit usage. And don't forget that PVE itself also needs some memory

First of all try a simple user with password. I do recall some issues when connecting as guest in such case. When doing a restore make sure the guest hw matches something the is has drivers for. E.g. - e1000 nic - data disk - known chipset (should not be a problem as q35 and i440 is well supported)

You are doing this by adding the PVE repository. It will replace everything necessary. No custom kernel build or compilation necessary. Just follow the guide here: https://pve.proxmox.com/wiki/Install_Proxmox_VE_on_Debian_Buster

Old installer maybe?

This isn't something which is limited py PVE. It is your guest operating system and its capabilities. Install another VM (or Container) which provides File Shares. Don't waste your time trying to achieve something which will not work!

A True-Nas VM is no dedicated File-Server / File Service?

As @LnxBil already stated: technically it might work but do yourself a favour and don't do it. Intelligence on top of intelligence usually leads to some interesting side effects. The HBA passthroughmode of the controller does disable the raid engine completely. You can identify it being...

Thats considered a custom disk setup which is not possible with the PVE installer. It is a software appliance trying to make install as simple as possible. This is the reason I have Used a Debian installation and converted it into a PVE install. Works great since years and even through multiple...

Probably. Do you have still access to the console? A mount is something during runtime. I'd just unmount it and see if things come back. If that does not work i'd try a reboot to get to a clean state

You are passing the same disk to two guest. This can't work. You need a cluster filesystem to be able to do that and even then this filesystem will not work across two different OS. If you want to share data between the two guests either create a dedicated file server or create a share from one...

Check in the guest is (windows) powershell if the disk is read-only. E.g. issue a "get-disk | select *" You should see an attribute which says "is read-only" - should be false

I expressed my opinion, this is hours. If I can't rely on data consistency it is not worth it. So your application needs to make sure to detect bit issues and then what? Can it recover? ZFS needs resources as it provides benefits through them. Imho this is a fair trade off. There are less...

If you have the right skills its doable. But don't expect anyone to provide a step by step, detailed instruction book. There are too many things that could pop up

Another Option would be to build two discrete clusters which can migrate within online and cross-cluster migrate offline (if you have enough nodes). Might in the end be a much better solution from a performance and usability perspective.

Jep. Between 5-30% according to my experience and measurements. So your milage may vary. Just consider how likely an attack is in your environment and if you can loose 30% performance. On my own system it did not really bother me, as I have no specific requirements. So I installed all the...

I am using luks encrypted disks below a volume group (LVM). AFAIK VGs can create a simple mirror, so technically that should be an alternative around your ZFS mirror. I don't like any of the ideas though because it really adds multiple layers of complexity. Anyways. Maybe this idea helps ;)

I don't get your problem mate. Your nvme pool is online. Are you concerned about the smart values the system can't read? To me this reads as if the devices are too new to be in the smart-database You can contact Kingston support - these guys are very fast and helpful from my experience

I'd expect it to break. The hardware is completely different. While it might boot and even might import your VM config it latest will drop out on the network if you ask me. So without some Linux CLI skills this is not doable IMHO. Just be aware that you are operating at an open heart when doing this

Technically you can use live migration between and and Intel. What it does though: it disables everything that leads to performance. This is exactly what you are dong with qemu64 architecture. You are emulating your CPU throwing all performance out of the window. I have not made any tests but I...

I'd try VMware converter first. However I have not used it for a long time and in the end you might run into the same issues as with clonezilla. The biggest point here is the virtual hardware. You need to make sure that your windows installation will have the right drivers included for disk and...