System hanging when trying to spin-up from HD idle

[cmrho]

So there is no wakeup with STOP@135W.
I guess values 2 and 3 are what you've set up with sdparm anyway itself...

https://manpages.ubuntu.com/manpages/xenial/man8/sg_start.8.html
sg_start --start /dev/sdX vs sg_start --stop /dev/sdX

I think a SCSI/SAS STOP mode is a special mode and only meant for maintenance*.

Edit:
*https://www.t10.org/ftp/t10/document.08/08-126r0.pdf
page3

I'm going to call off any further work on this. I've never had so much difficulty putting drives into standby, lol. SATA disks are way easier. I got a fantastic deal on these relatively new drives, but I might be paying for it in the long run (in electricity). Thanks again for all of your assistance!

 

[tconnors]

Have you tried any of:

````
sg_start -r --pc=2 --mod=1 /dev/sdm
sg_start -r --pc=2 --mod=2 /dev/sdm
sg_start -r --pc=3 /dev/sdm
````

Per eg https://www.seagate.com/files/docs/pdf/en-GB/whitepaper/tp608-powerchoice-tech-provides-gb.pdf p7, power condition value 2, modifier 1 is idle_b (recovery time might be 0.5sec for some devices), pc2, mod2 is idle_c (heads unloaded, "reduced RPM" -- never seen that actually happen, mind you, recovery time 1sec for some devices)), and pc3 is standby_z, or spun down, recovery time 8sec for some devices.