wrong, dirty bitmap is from qemu process, it works with all formats including zfs, lvmthin, qcow2...
it allow skipping reread all source data.
only changed blocks data will be sent to PBS. it works only when VM is running, not shutdown or reboot.
don't forget PBS datastore is millions of small files so HDD will slowdown before TLS limit.
if already SSD, you can try installing PBS alongside PVE keeping NAS as NFS or cifs datastore.
it's not recommended but if you know what you do, it's works great.
afaik, ifreload -a is recommended.
https://forum.proxmox.com/threads/using-systemctl-restart-networking-bridge-interface-disappeared.144373/post-649718
if you use Proxmox Backup Server, you can restore disk manually :
https://forum.proxmox.com/threads/restore-individual-disk-from-pbs.115024/post-588786
CEPH (and ZFS) require datacenter ssd because they have PLP which allow fast and secure write.
btw, Windows write cache in its device manager need to be turned off to compare to an hypervisor.
you will learn how PVE works when you install the provided iso.
You need to "see" the default network & storage configuration to "understand" them.
once you get the basis, you can install it over a regular debian server.
as think it's expected.
2690 has 3,8 GHz and 135W while 2650 has 3,4 GHz and 95W.
have you tried with mitigations=off ?
have you used iperf3 parallel connections ?
try with iperf2
it'll work, but you need to update /etc/network/interfaces with keyboard & screen physically connected to the new system.
ip a to show interfaces of the new server.
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