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I have same problem on pve-manager/7.0-11/63d82f4e (running kernel: 5.11.22-4-pve). I have two nodes in cluster. Each node have ext4 FS mounted in "/Proxmox/cfs-ext4" on their SSD. When i try live migration VM that have EFI disk: 2021-09-22 02:00:55 starting migration of VM 102 to node 'pve-01'...

Network is virtio. Hdd is Virtio SCSI and also Virtio Block.

@Vladimir Bulgaru This is no one file 30Gb size - this is 6 ISO-images from 4 to 6 Gb each. Again, I don't see any performance trouble on XFS or EXT4 filesystems on this disks (SSD, SAS or clear SATA without any RAID). I see trouble with speed on 6 different PC (5 servers and one desktop PC from...

On Linux hosts same trouble with performance :( I added one SSD kingston 120Gb on my server as log device for ZPOOL from 6 disks HWraid6 - nothing change, speed down after copy around 1-2 Gb ISO. But, if I do zpool from this one SSD - speed down after around 30Gb copy. On two SSD with ZFS...

Vladimir, thanks for reply. 1) Raid0 from LSI controller build with these param: Current Cache Policy: WriteThrough, ReadAhead, Cached, No Write Cache if Bad BBU. I have not BBU. I do not thing, that trouble with cache of HW Raid controller - on ext4 do not have speed trouble. 2) Virtio Drivers...

Good day to all. I have five servers with Proxmox version 5 installed and all have the same problem with the performance of hard drives inside the guest VMs. Problem with ZFS and LVM. The ZFS problem is the following: inside virtual machines that are located on the ZFS storage, when copying...