[SOLVED] cp --reflink=auto between ZFS subvols uses all CPU

[ccj47]

It was a cp --reflink=auto operation on the PVE 9.0 host. I wanted to move some files between ZFS subvols with cp --reflink=auto and then delete the source (I think it's faster than mv or rsync). However, operation took all the host CPU usage and then all LXC / VM stopped working due to the lack of CPU cycle. The zfs pool is 2x HDD mirror plus 2x SSD special device mirror, and the host is proxmox-ve: 9.0.0 (running kernel: 6.14.11-4-pve).

Any idea why the cp operation took all the CPU cycles? TIA.

 

[LnxBil]

As far as I read in the openzfs issues list, this may still not be that stable at the moment. There are some issues with cp --reflink, so may want to do it just the old way without the --reflink.