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Why you use LVM in VM and then XFS? Maybe that makes bugs.

/etc/rc.local is very old startup script. And I like it.

Does your HBA shows disks? Can you boot from cdrom/usb/(disk attached to motherboard)?

Are you sure you need dedup? It require RAM .... a lot.

If you will set dedup for pool it will be inherited for lowers levels of fs/volumes. Except if you set for everyone manually.

Another solution is to use single ZFS file system with dedup and use it as directory mount point in Proxmox. Use VM disk as images (raw,qcow2,vmdk)

You can change ARC size live with: #echo 2147483648 > /sys/module/zfs/parameters/zfs_arc_max and #echo 2147483648 > /sys/module/zfs/parameters/zfs_arc_min if you want fixed ARC size. I use /etc/rc.local for custom tuning the system.at startup.

You know ashift is immutable so Proxmox is not invented nothing with it. edit: This named blocks is more closer to VM filesystem block naming.

No point. It will effect only single fs/volume with no effecting children data`s

You made some mistakes. If you want to change VM ID you need. 1. Turn off VM. 2. Rename VM config file. 3. Change VM disks location ( in ZFS rename ) 4. Change config disk location inside VM config file. 5. Start VM p.s. why a lot of people do server restart? Do you use windows or what?

Why reboot? This setting activate online.

Change the strategy of backup. Use bareos inside VM to do increment backups.

Better solution

I hope Proxmox team will correct me. /lib/systemd/system/pvestatd.service After=pve-cluster.service zfs-mount.service

It is old know issue. Check startup order and make ZFS start before pvestatd.

As i know - ZFS have no tools for it.

As I know - impossible.

If you did not know ZFS have its own mechanism to control HDD queue.

Just don`t forget sync=disabled in the machine crash you can lose some data.

Specter Meltdown?