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Proxmox needs static IPs. You cannot dynamically assign an IP to a Proxmox node.

If you want to lose data, then yes.

With replication size 3 you have a max usable capacity of 5.2 TB as this is the capacity of your smallest host. Your OSDs are very unbalanced across the hosts which is not good for such a small cluster. This is why the OSDs in pve10 reach the nearfull ratio and refuse to take any more data. You...

If you want to use NFS mounts but not for Proxmox storage just put them into /etc/fstab.

Do you run Crph along with the VMs on the same hardware? The load may be too high: osd_scrub_load_threshold Description: The maximum load. Ceph will not scrub when the system load (as defined by the getloadavg() function) is higher than this number. Default is 0.5. Type: Float...

There seems to be no driver support in the Linux kernel at the moment for this combination.

The qlcnic driver module is for a different kind of devices. You can compare the "alias" section in the modinfo output for both.

There is now a kernel patch available: https://lore.kernel.org/io-uring/8b7a8200-f616-46a8-bc44-5af7ce9b081a@kernel.dk/T/#u OCFS2 seems to be unmaintained.

Check the MTU settings of the network interfaces.

qla2xxx is a fibre channel driver. AFAICT it cannot do Ethernet.

Wenn Du nur einen einzelnen Proxmox-Host hast, brauchst Du das Thema SDN nicht. Erzeuge einfach ein eeiteres Bridge-Interface ohne physischen Port und ohne Adresse und nutze es als internes Netz für die VMs.

AFAIK Ceph cannot run dual stack. And the MON addresses are recorded as IPv4 in the cluster map. The same goes for the public_network and cluster_network settings. You would have to manually change the MON map and these settings and then adjust the ceph.conf.

Have you run top?

I am biased but have a look at checkmk: https://checkmk.com/

no, you can link both Proxmox nodes directly

Yes

You should run memtest86 on that machine.

If you directly link both Proxmox nodes with two cables without the hub you can configure normal bonding interfaces between them. There is no "server side" with LACP, just two Ethernet partners talking to each other.

Are there any IO errors shown in the kernel log for this device?

You cannot use a hub to do bonding / link aggregation. The link partner has to support LACP. The only option is to use the active/backup mode (not 802.3ad) and then only utilize one of the two NICs at a time.