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Any tips, please?

Using ZFS 0.6.4.1-1 and Proxmox as VE for my KVM ~32 machines powered with cache=writeback (cache=none not starting) Deduplication disabled, primarycache/secondarycache=all, checksum/compression ON. compressratio 1.71X, sync standard. When I start copying heavy files (~1G) inside the guest...

It's direct ZFS install on PVE host with raid controller using ZFSOnLinux. Pretty stable configuration and i'm loving it. Nothing strange. You are using ZFS over network transfer, i'm having direct ZFS install on PVE host. So that first performs the network and actually write to disk occurs...

Problem fixed after switching from QCOW2 disk image to RAW.

Using ZFS 0.6.2 on RAID10 and Proxmox as VE for my KVM machines powered with cache=writeback (cache=none not starting) Deduplication disabled, primarycache/secondarycache=all, checksum/compression ON. compressratio 1.71X, sync standard. in KVM (qcow2) ++++++++++++++ $ dd bs=1M count=512...