The customer was referred to the hardware and virtualization vendor.
The hardware vendor added several more 10 gigabyte paths to the storage array.
The virtualization vendor increased the network maximum transmission unit (MTU) from 1500 to 9000.
The hardware vendor updated the firmware version of the storage array and the software version used to govern the storage array.
The virtualization vendor altered the write policy used to the storage array from "most recently used" to "round robin".
The iSCSI storage was re-configured to remove "delayed ack".