I have 2 KVM nodes, no shared storage
The VM disks are stored locally on the servers, which is fine for our purpose.
I noticed that during VM migration, the network speed is capped at 33MByte/sec (around 280Mbit/sec)
Same result with a scp between nodes
I’ve checked with iperf (1Gbit - good), I’ve checked disks with dd (over 350MByte/sec - good)
Finally I find the culprit: it’s the ssh encryption
I’m using CentOS 8. I changed the cipher, and I had best results using firstname.lastname@example.org
scp -c email@example.com bigfile.iso node2: 105.8MB/s
There is a way to force OpenNebula to use a specific cipher during migration tasks?