[mythtv-users] Backend Hardware Questions

[Hika van den Hoven]

Hoi Henk,

Friday, January 16, 2015, 8:14:41 PM, you wrote:


> On 16 Jan 2015, at 19:47, Henk D. Schoneveld <belcampo at zonnet.nl> wrote:

>> 
>> On 16 Jan 2015, at 19:03, Jan Ceuleers <jan.ceuleers at gmail.com> wrote:
>> 
>>> On 16/01/15 11:36, Henk D. Schoneveld wrote:
>>>> I would suggest check power-consumption first with a Kill-Watt device,
>>>> most PSUs are way to big and are most efficient when loaded at > 75% of
>>>> max capacity. HD’s don’t use that much power.
>>> 
>>> Power supplies need to be dimensioned not for average load but peak
>>> load. Which occurs at boot when the disks all spin up at more or less
>>> the same time.
>>> 
>>> So unless you have a fancy controller that spins the disks up one by one
>>> you need a lot of headroom on top of the system's average load after boot.
>> You can watch what booting needs, you’ll probably surprised how low it is. Of course you can also encode multithreaded and see how high it goes.
> MAX TDP of X4 B50 =95W 
> Under max. load with 5 - 8 drives it will < 150W
>>> 

You made your point. But, running stationary to close to max can
decrease live expectancy and increase chances of instability, where
the latter also goes for running to low. Plus not leaving space for
incidental peak loads.
So a save bet in my estimation is to take twice or a little more than
the stationary use.
While maybe not optimal in power consumption, it ensures maximum
stability. Which I think is the main objective.


Tot mails,
  Hika                            mailto:hikavdh at gmail.com

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