I've posted before about my Venus DS3R Pro2, specifically in relation to using USB3.

But this a different topic about the same device.

It doesn't seem to do any power-saving on its own, i.e, the drives stay spinning continuosuly, 24X7. Setting the appropriate power-save options in the screen saver or power manager screens doesn't seem to have any effect on these drives.

Wondering if anyone can suggest other ways to approach this?

Normally it is idle for about 23H, 57M per day, as it only runs a short backup session at 00:30, using rsnapshot which doesn't take very long at all.

cat /proc/scsi/scsi reports: Host: scsi6 Channel: 00 Id: 00 Lun: 00 Vendor: ATA Model: JMicron H/W RAID Rev: 0958 Type: Direct-Access ANSI SCSI revision: 05

dmesg reports: sd 0:0:0:0: [sda] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA sda: sdc1 sd 6:0:0:0: [sdc] Attached SCSI disk ... EXT4-fs (sdc1): mounted filesystem with ordered data mode. Opts: SELinux: initialized (dev sdc1, type ext4), uses xattr