keeping USB disk awake

[Rick Stevens]

On 04/12/2013 04:27 PM, Bill Davidsen issued this missive:
> Sherman Grunewagon wrote:
>> On Wed Apr 10, 2013 at 11:41 AM, Bill Davidsen wrote:
>>> Sherman Grunewagon wrote:
>>>> On Tue Apr 9, 2013, at 06:02:08,  pomo wrote:
>>>>> On 09.04.2013 07:38, Sherman Grunewagon wrote:
>>>>>
>>>>>> I have an external SATA disk in a USB-3 / eSATA docking
>>>>>> station. When I connect using eSATA, the disk stays awake. But when I
>>>>>> connect using the USB-3 port, it goes to sleep after a few
>>>>>> minutes. How do I make it work like the eSATA?
>> <snip>
>>
>>>> Other suggestions?
>>>>
>>> Have you tried just disabling spindown? (hdparm -S0 drive)
>> Thanks. I have now, as well as hdparm -B 255 drive.
>> The disk/docking station still suspends after a few minutes.
>> I'm ready to try recompling the kernel with CONFIG_USB_SUSPEND=n
>> But since
>>
>>      for i in /sys/bus/usb/devices/*/power/autosuspend; do echo -1 >
>> $i; done
>>
>> also has no effect, I think it will be a waste of time.

I believe you should be doing

     for i in /sys/bus/usb/devices/*/power/autosuspend_delay_ms; do echo 
"-1" >$i; done

Or

     for i in /sys/bus/usb/devices/*/power/control; do echo "on" >$i; done

They're supposedly equivalent (according to the kernel docs).
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- Rick Stevens, Systems Engineer, AllDigital    ricks at alldigital.com -
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