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It doesn't necessarily have to be a local device. Start the host in single mode You can look at the entries in /etc/fstab and the logs journalctl -u sys-fs-fuse-connection.mount

I don't have much experience with slog. On my nvme disks when testing via fio, the maximum slog capacity was 8GB, I don't have this pool in production yet. Large slog sizes will never be used. If some of your disks are platter disks, it would be better if you could reduce the slog and add vdev...

In my opinion, for slog this vdev is too big. With 10Gbit network 16GB should be enough. Read the ZFS paper that TrueNAS prepared. There are two parts. https://www.truenas.com/blog/zfs-pool-performance-1/

Lexar NM790 1TB is enterprise? Are you satisfied with this series of disks? Do you have them running under ZFS in some raidz or mirror configuration? I'm looking for some drives with the size M.2 2280 max.

Try mountpoints pct set 100 --mp[n] [volume=]<volume> ,mp=<Path> [,acl=<1|0>] [,backup=<1|0>] [,mountoptions=<opt[;opt...]>] [,quota=<1|0>] [,replicate=<1|0>] [,ro=<1|0>] [,shared=<1|0>] [,size=<DiskSize>]

Show us the configuration of the faulty machine and the working machine. You can call it with the command qm config 103. And additionally how storage cat /etc/pve/storage.cfg is configured. Maybe something could be deduced by comparing.

The messages indicate that the machine's disk is located on a shared NFS share. Is the storage on this NFS visible and accessible from the node on which you are making the backup?

your ssd is at /dev/nvme0n1 smart 4 Start_Stop_Count 0x0012 098 098 000 Old_age Always - 3247 Maybe a bit too many start/stop events. Unless it's some kind of energy saving. Possibly check the cables and power supply of this disk. It's possible that there are...

Where virtual machine images are stored is defined by the configuration in the /etc/pve/storage.cfg file and you probably have local-zfs content images,rootdir there. Your command looks correct to me.

Linux bridge

no it is /dev/sda, only at this disk is ext4. check S.M.A.R.T. smartctl -a /dev/sda

I don't know, maybe I'm wrong. Do you have snapshots on this machine and are there many of them?

https://forum.proxmox.com/threads/does-dir-storage-support-thin-provisioning.48950/

Please revmove fingerprint from you answer, at forum, it you security. Yor machine are at local-lvm, type thinpool. Example VM declare 200G, data on this 1G. Real data is 1G If you transfer from local-lvm to VMS (storage directory type) real data is 200G /vms what mount at this? You need to...

The directory storage do not support thin provisioning. Look at this https://pve.proxmox.com/wiki/Storage Show your configuration of storage cat /etc/pve/storage.cfg

Bridge is not running. try this, check log journalctl -rb -u networking.service

Show us here. Text or photo

enter to the console and ip a cat /etc/network/interfaces cat /etc/hosts

Yes, my reply was to bixnandy, not you. We were writing at the same time.

bond on 1 interface? https://pve.proxmox.com/wiki/Network_Configuration#sysadmin_network_bond