On 27/10/17 20:46, Pat Riehecky wrote:
> 
> 
> On 10/27/2017 02:17 PM, D Greig wrote:
>> On 27/10/17 17:24, D Greig wrote:
>>> Hi,
>>>
>>> I am looking for help on how to stop/disable the HDD spin down option
>>>
>>
>> I should add that the laptop has a fresh(yesterday) install of SL7.4.
>>
>> "hdparm" was not present on the system, so I installed it from SL repo.
>>
>> Now I am unsure as to the safest way to use it for the task.
>>
>> In the past spindown is disabled by default.
>>
> 
> This should probably get you going: 
> https://wiki.archlinux.org/index.php/hdparm#Persistent_configuration_using_udev_rule 
> 
> 

Hi Pat,

That led to a fix.

Many thanks.

hdparm -B 255 /dev/sda
Sorted it.

now:
[root@mu dg]# hdparm -B /dev/sda

/dev/sda:
  APM_level	= off
[root@mu dg]# hdparm -B /dev/sda

/dev/sda:
  APM_level	= off

I can understand spindown might be useful on battery, quite dangerous on AC.

There used to be an option in "power manager", but not on SL7.4.

-- 
Best Regards,
D Greig