HawaiianPi wrote: ↑
Wed Jun 05, 2019 7:52 pm
More than one power efficient SSD could work, but power requirements for SSD varies a lot, so it would depend on the drive models.
and the used USB-SATA adapter..
LTolledo wrote: ↑
Wed Jun 05, 2019 10:12 pm
One-HDD + one SSD is a "hit or miss"
yeah.. let's add more cause more is better.. more data corruption due to things go worse over time on the other hand is.. not as funny.
josephchrzempiec wrote: ↑
Wed Jun 05, 2019 10:34 pm
The only problem i have is that i have to manually solder wires to the usb to sata adapter or cut the usb wires and power like that. And still share a common ground.
likely that powering over GPIO header skips the 2.6A diode (didn't check the snippet of schematics which are open accessible), probably not recommended by the people here.. But often done on SBCs which have too much consumption for a badly chosen powering solution (e.g. microUSB). But no experience on the RPi.. Mine runs headless without anything except camera so I don't have powering issues at all.. All 'NAS boxes' are different SBCs with reliable powering for such an use-case.
PhatFil wrote: ↑
Thu Jun 06, 2019 2:38 am
Perhaps its wise to consider using 2x psu's ...
fwiw my approach was to use a seperate pc psu to supply 5v needed for the usb hub and 12v needed for the 6x external HDDs i need rare and infrequent access to. this allowed me to turn power on/off to the disks via the pi on demand when the data on the disks is required (using a mqtt enabled smart switch).
and to stop back powering the pi from the usb hubs 5v supply i only needed to snip the +5v wire connecting the slave USB connector to the hub PCB.
Node Red issues the mqtt command to power on the disks waits 60 seconds and then triggers a shell script to mount the drives, when finished with the disks another flowette calls an unmount scrip before issuing the mqtt to power of the hub/hdd psu. Thanks to the alexa-local node i can issue the disks on/off commands verbally which still tickles me a bit
sounds funny and insane at the same time..
josephchrzempiec wrote: ↑
Thu Jun 06, 2019 9:52 am
Just a update. I did order some of these. But i had a old USB extension that my cat chewed up a while back i shorted up and sense i only had one I can power one drive off of it and two drives by the raspberry pi so that makes three i can power up with no problem. that is good thank you all for the help. Now i just have to wait into the other ones come in to power the forth one up.
I would suggest to test the setup for reliability (e.g. data corruption) before I would run such a setup 'productive'...
If for whatever reason it has to be a RPi I would opt for a 'power sombrero'.. There are a few out for the "RPi formfactor". One of them even provides two USB A receptacle for proper powering with y cable solutions..
At least two 'competitors' provide boards with 'SATA hats' (over PCIe) with a sane powering solution for up to 4 discs (12 and 5V) on ARM based SBCs.