I don't see any attachments on your post.
Please give us more information:
- What is the output of following command during the performance reduction?
::> set advanced
::> dashboard performance show
node shell: "sysstat -x 1", "sysstat -m 1" and "sysconfig -r"
::> statistics show-periodic -node -object nfsv3 -instance -counter nfsv3_ops| nfsv3_read_ops| nfsv3_write_ops| nfsv3_throughput| write_avg_latency| read_avg_latency| write_percent| read_percent
--- change nfsv3 to nfsv4 if you use nfsv4
- Do you have one lif per node ?
- How much volumes and aggregates do you use for the test ? (disk type, disk count)
- Any flash accelerator in use ?
- FIO config files