Hi all,
i'm faced with the same issue:
TestVM (redfour)
Snapshot
Start: Jan 13, 2020, 10:13:51 PM
End: Jan 13, 2020, 10:13:56 PM
Local iSCSI
transfer
Start: Jan 13, 2020, 10:13:56 PM
End: Jan 13, 2020, 10:17:18 PM
Duration: 3 minutes
Size: 813.17 MiB
Speed: 4.03 MiB/s
Start: Jan 13, 2020, 10:13:56 PM
End: Jan 13, 2020, 10:17:18 PM
Duration: 3 minutes
Start: Jan 13, 2020, 10:13:51 PM
End: Jan 13, 2020, 10:17:19 PM
Duration: 3 minutes
where the backup volume is served on iscsi by a machine having raid5 over 1 Gbps back to back connection to the hypervisor.
Mouting that volume in the hypervisor and doing some transfers, traffic easily goes up and beyond 800 Mbps whereas the backups takes forever to execute.
I am uzing zstd as compression and xcp-ng 8.0 on the hypervisor
One thing i noticed is that xo-server takes 100-130% cpu when the backup is executing.
The vm above is about 2gb uncompressed, however larger VMs take over 8 hours to complete a normal backup, nothing fancy.
Thanks,
Viorel