I have a freshly installed Ubuntu-server which is ought to be the new backup-server for our VM-storage. The server has 4 nics, 2 of them 10Gbit (in fact an intel x540-T2 with the newest driver available) which are used to connect to the SAN. I have the nfs-share mounted locally and compared speed-differences while copying a directory with ~30 files, around 15 vm-images and corresponding log files. The Images are between 8 GB and 600 GB in size. Using:cp -rf /mnt/nfs-share /backup-storage/bmon shows consequently around 600 MiB/s.Usingrsync -av /mnt/nfs-share /backup-storage/bmon shows some packets in the first seconds, halts for about 30 seconds and than builds up to about 60-75 MiB/s. CPU is around 60%. What should/could I change to use rsync with the same performance as cp?
rsync is very slow (factor 8 to 10) compared to cp on copying files from nfs-share to local dir
ubuntu;rsync;performance;cp