I have 6 NFS Mounts (1GbE) on a RHEL 5.7 system with 10GbE.
Iperf shows full link saturation to all 6 interfaces simultaneously.
There is a bottleneck somewhere within the nfs client system, but I cannot find it.
It can write to 3 of the mount points simultaneously with full link saturation, but when this number is increased to 6, each point only writes at about half of link speed.
I am suspicious about the number of nfsiod threads, but cannot find this option/setting anywhere.
The problem also appears to exist on Ubuntu, but manifests differently - it completes several transfers at full speed, and some with degraded performance. On RHEL, the performance of all transfers is degraded.
How can I troubleshoot further? Thanks.