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-written¹... >
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. > > ¹) 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.
