Enabling async IO for an iSCSI LUN
Enabling async IO can improve the performance of a block-based LUN over an iSCSI connection, particularly for LUNs containing dual-actuator HDDs.
QTS enables async IO for the iSCSI LUN.
Note:
If you want to disable async IO later, you must restart iSCSI & Fibre Channel service or restart the NAS in order for the change to take effect.