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Newly created zvol do not resolve this problem. I think this is not problem with zfs.

So you suggest to test it on newly created zvol?

I have tryed limiting bandwith even by hardware (configured other interface to run live migration with hardware 100 Mbps ports). This not helped because there was not too much network traffic while zeroing disk. While it zeroing htop show max usage of disk IO write which cause the problem...

Hello, the problem still exist and I found same issue here: https://forum.proxmox.com/threads/vm-live-migration-using-lvm-thin-with-discard-results-in-high-i-o.97647 Sadly I didn't find there fix for this problem. Do anyone know is there and option to start live migration on destination node...

Both nodes have same zfs storage configured. Changing one option - discard - on source VM hdd make this problem. When on then IO killing other VM's on destination node before "data" start transfer (it's take about 10 mins). If I disable this option then "data" transfer start immediately and not...

At this moment I know what causing this problem. It begin at 1st phase of live migration, while destination machine allocating disk space for migrated machine. When source VM hard disk has enabled discard flag then allocating probably fill all space with zeroes (very big use of Disk Write...

I made backup from other VM to this node and 240G system disk was backed up in 8 min. 109: 2022-02-23 12:45:11 INFO: backup is sparse: 119.36 GiB (49%) total zero data 109: 2022-02-23 12:45:11 INFO: transferred 240.00 GiB in 529 seconds (464.6 MiB/s) 109: 2022-02-23 12:45:12 INFO: archive file...

balloon: 0 boot: order=scsi1 cores: 4 ide2: none,media=cdrom memory: 4096 name: testing net0: virtio=7A:0C:56:0B:5B:48,bridge=vmbr1 net1: virtio=36:0B:39:C0:DB:C5,bridge=vmbr1,tag=126 ostype: l26 scsi0: ssd2:vm-101-disk-4,cache=writeback,discard=on,format=raw,size=100G,ssd=1 scsi1...

Hello. I have problem with IO delay while live migration. Two nodes are Supermicro 2U servers connected with 10G link and proxmox verson 7.1-10. Now 1st node is in test stage without VM's. It's 40 x Intel(R) Xeon(R) Silver 4114 CPU @ 2.20GHz (2 Sockets) witch 187.58 GiB RAM. Both nodes have same...