Linux-Fan wrote:

>> So the conclusion is to take the SATA extention/expansion board.
>> I saw some of them (4 ports) are coming with external power supply. IMO
>> it doesn't matter what "regular" system you take, cause the disk has the
>> same power consumption be it on the "regular" or on the rpi.
> 
> I said "regular" so unspecifically, because for most people, RPI / ARM SBC
> style computers are not "regular". From my experience, it is more
> difficult to install Debian on them and even then less software is
> comptabile -- mostly if you need proprietary stuff, but this can include
> self-written┬╣...
> 

Well ... the subject here is for Rpi

> Consider my "regular" system: An amd64 PC with a "regular" tower-style
> case: It has a single ATX PSU (only one power connector needed, attaches
> problemlessly to any UPS) and offers space for at least two 3.5" internal
> HDD drives -- all neatly organized, single PSU solution.
> 
> Consider a Raspberry PI: External PSU for the Raspberry PI, two external
> PSU for two external HDDs. It gets easier with the SATA hat, but even then
> you need to somehow power the whole system. A single PSU at the USB input
> for the RPI is likely not to be sufficient etc. Much more thinking about
> electricity and the case to embody all those components. And then you have
> not solved the software side yet.
> 

https://shop.allnetchina.cn/products/dual-sata-hat-open-frame-for-raspberry-pi-4

> Also, never underestimate the OS disk: RPIs boot off a microSD card. I am
> surprised that my Banana Pi M2+EDU still runs on its first card after more
> than two years, so it seems to be possible to get some reliability out of
> the cards. Still, if thinking about a RAID1 of HDDs, to comploete the
> reliability consideration, one would possibly like to boot the OS off a
> RAID1 as well; impossible with RPI AFAICT...
>
Here it boots off tftp and has no card at all. The first RPi has one 512mb
(may be 15y/o) with only the boot stuff there.
 
>> I don't understand how power consumption can raise significantly because
>> of the board? Do you mean that processing the data demands more power on
>> the CPU?
> 
> Processing data on ARM may even be more efficient than on amd64. I meant
> the relation between the board's operating power and the disks'. If you
> calculate 4W for each disk and 4W for the board you already spend two
> times the power on disks than on the board. I know that there are amd64
> systems available with ~15W idle power consumption. Add two disks: ~23W --
> still maybe twice as much as for an equivalent RPI system, but much easier
> to setup and from my personal point of view it is more the kind of
> technolgoy to which I am used (i.e. simplified maintenance).
> 

But those disks have equal power consumption independent if it is on RPi
or "regular" system. The regular consumes more power because of the CPU and
board. I prefer smaller like the RPi with about 10-15W is OK

>> Look here exactly for the purpose:
>>
https://shop.allnetchina.cn/products/dual-sata-hat-open-frame-for-raspberry-pi-4
> 
> They seem to recommend using an ATX PSU for 3.5" HDDs, so it is getting
> more similar to a "regular" PC and finding a case for all this is getting
> more difficult? :)

No because the regular PC would consume more power because of the CPU and
other stuff on it.

Regarding the case - you can usually put anything smaller in something
bigger - there are even boxes for nas that a RPi and few disks will fit.

> 
> ┬╣) Yes, I was already bitten by this; details available for interested
> parties

Perhaps not the only one - especially when you are not that familiar with
electricity.

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