Nutanix has reported that there is a performance issue with NX-8K and NX-9K series nodes after upgrading to NOX 4.1.1 (Nutanix Field Advisory #27). Nutanix engineering is working on the problem. Mean while the customers are advised not to upgrade to NOS 4.1.1 when running on NX-8K and NX-9K nodes. More information about the problem will be published on 9th of February.
IO performance issues with NOS 4.1.1 on NX-8K and NX-9K series nodes