[asterisk-users] No-mobo PC for USB Drives Enclosure?

[Atis Lezdins]

On Wed, May 14, 2008 at 10:41 AM, Stelios Koroneos
<skoroneos at digital-opsis.com> wrote:
> As people have sugested the ATX power supplies can work without a mobo
>  One thing to watch out for your setup is the actual ampere requirments for
>  your disks
>  i.e Your power supply provides 300W but this is "partitioned" to different
>  voltages (+5, +12, etc) with different amp charecteristics
>  Disks need 2 voltages. One for the logic (+5V) and one for the motors (+12V)
>  and have different current requirments.
>  Most disk (if not all) mention these ratings on the labels they have
>  What you must do, is to see if by adding the current requirments seperatly
>  for +5V and +12V, does not exceed the power supply's amp rating *for that
>  voltage*, allowing also for a 15% -20% margin, as power consumption will be
>  higher than the nomimal mentioned during disk startup (and you will be
>  starting all your disks at the same time)
>  Also make sure your box has sufficient cooling and there is some short of
>  airflow over the disks, as the number 1 enemy of disks is high temperature
>  and stacking so many disks in a box will create large amounts of heat.
>
>  I would suggest you to get a good (aka expensive) 500W power supply and use
>  10-12 disks with it to avoid problems in the long run,
>  Also keep in mind that MTBF specs of SATA disks does not make them an ideal
>  candidate for 24/7/365 operations

Another thing is voltage feedback. The Gray wire should be grounded
when +5 and +3.3 V is ok for m/b. As +5 is shared also for disk
connectors, there could be some problems.

Also be advised that you should buy good power supply, as the
difference is in voltage stability, and hard disks don't like floating
voltages much.

I would suggest you to go better for some network oriented setup, use
NFS ir CURL for configs, etc. Imagine what will happen if that one PSU
will fail.

Regards,
Atis

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Atis Lezdins,
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