We have a 2 host cluster with hyper-V based on Windows 2016 patched
We have a Fujitsu DX SAN 10 Gb iSCSI SAN as the primary storage, connected using 10 Gb SFP+ DAC connections to the servers
Both iSCSI networks are isolated from the rest of the environment.
We are using MPIO and 2 connections for the iSCSI configuration on each host
When the iSCSI volumes are configured and mapped with a network drive on a single host we get good performance moving things in and out of mapped drive, anything between 5-8 Gbps
The moment we add the same volume as a CSV to the cluster, performance drops drastically to 1 Gbps
We have been testing different configurations, disabling unnecessary protocols on the NICs and others.
Had a remote session with Fujitsu and they are pointing the finger at Microsoft
Is there any particular necessary configuration to get the full performance out of the CSV?