I have a server with 2 x 10 G connection, which are combined via a LAGG. The plan was to be able to backup as many devices as possible at the same time. On the server runs the rest server.
However, as soon as I start an inital backup from 50 servers, I have a CPU load of 100% on the backup server and get a maximum throughput of 300 MB/s. - Even with more servers I get a maximum of 300 MB/s.
To exclude the possibility that this is due to limitations of my network setup or the storage, I have already made appropriate tests. Both the hard drives and the network are capable of much more.
Therefore I have the assumption that it is because of the high CPU load.
The specs of the server:
Network: 2 x 10G
CPU: 2 x XEON E5 2620 v4
RAM: 256 GB RAM
Disks: 147 x 1.9 TiB in zraid2
I am grateful for any tips to improve the performance.