Prevent TL-R1600PES connected to TS-h2490FU going into standby mode.

Hi QNAP,

I have connected a TL-R1600PES to a TS-h2490FU using a QXP-3X8PES card. Everything seems great except the expansion bay seems to into standby mode when not accessed for a period of time. I.e. if I go to a shared folder on the TL-R1600PES first thing in the morning, it will take about 20-30 seconds before I see shared folder contents, and Storage and Snapshots says there are no drives in the expansion bay during this time. The NVME based folders in the main unit respond during this time.

I need to disable these drives or the expansion bay spinning down, but there is no option in Control Panel → System → Hardware to enable or disable drive standby mode.

How do I prevent the drives/expansion unit from spinning/powering down? Or is this some other issue?

Firmware: QuTS hero h5.2.9.3499

Expansion drives: 16x ST28000NM003K

Let me know if you need any other details?

Thanks,

Mikey