How to power down WD RED drives on Linux manually?

[Revan]

Does anyone know how to power down WD Red drives on Linux to be able to remove them from the drive bay while the PC is running?

If i unmount all partitions of the drive i am not really sure if the drive is still spinning.
I assume it still does do spinning.

When i use the following command to turn the drive in sleep mode to enforce the spinning of the drive:

Code:

sudo hdparm -Y /dev/sdc

The /var/log/kern.log shows that the drive is automatically waking up again:

Code:

Jan 27 ... kernel: [...] ata6.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x6
Jan 27 ... kernel: [...] ata6.00: waking up from sleep
Jan 27 ... kernel: [...] ata6: hard resetting link
Jan 27 ... kernel: [...] ata6: SATA link up 6.0 Gbps (SStatus 133 Scontrol 300)
Jan 27 ... kernel: [...] ata6.00: configured for UDMA/133
Jan 27 ... kernel: [...] ata6: EH complete

The following command gives the following output:

Code:

sudo hdparm -c /dev/sdc

/dev/sdc
IO_support=1   (32-bit)

There is no reliable info about the status of the spinning of the drive.
Only the temperature might be a hint, it is showing 26 °C while another drive in the bay which data is written to shows 30°C.
Is it safe to just remove the drive from the drive bay?

 

[Johnnie Black]

This usually works for, you can hear the disk spinning down:

echo 1 > /sys/block/sdX/device/delete

 

[Revan]

Thanks a lot. That works perfectly.

EDIT:
Btw, what i found out.
If i use the lowercase option -y instead of -Y the drive at least goes into standby mode.

Code:

sudo hdparm -Y /dev/sdc

That's at least what the command

Code:

sudo smartctl -i -n standby /dev/c

says.

It gives the following output

Code:

smartctl 6.6 ..
Copyright ...

Device is in STANDBY mode, exit(2)