My HP T620 has a 4 core cpu GX-415GA, 4 GB RAM and 8 GB SSD.
Make shure to get one with its power supply.
I am using Open Media Vault V 6 as the operating-system for the NAS.
It is based on Debian-Linux and fits on the 8 GB SSD.
There is one obstacle that you have to bypass after installation of OMV:
The T620 will not boot, because the HP bios has an issue.
You can find the solution here:
https://forum.openmediavault.org/index.php?thread/28503-no-boot-device-after-initial-install-on-hp-t620/&pageNo=1
Scroll down to the post of the user Frepke dated 12. Dezember 2019.
You will have to remove the plastic case from the HP T620 (flat screwdriver will do).
The panels of the case are laser cut. I used 3 mm black acrylic.
The positions of the printed parts and screws can be seen in the Parts_Assembly.pdf.
The parts are printed with PETG, 0.2 mm layer height, 0.4 mm nozzle, support when noted.
For the nuts that are not in a pocket. i used self-locking nuts. (vibrations from HDDs)
The power supply for the drives is a Meanwell LRS-100-12 (12V 100 W) and a
no name step down converter 9 - 36V down to 5V.
You will also need an adapter from Mini-PCIE to PCIE. You can see the one i used on one of the photos. It was intended for GPU-mining, but also works well for a SATA-card.
You have to connect the power supply to it.
The PCIE-SATA-adapter must be low-profile or it will not fit in. The one i use has the SATA-controller AS Media 1064 and worked without driver installation.
If you have a SATA-connector with a notch on the drive connector (the one with the yellow SATA-cable on the photo), you have to print the parts 1A and 2A for a drive bay.
if you have a SATA-connector with the slots for screwing on the drive connector (the one with the red SATA-cable on the other photo), you have to print parts 1B and 2B for a drive bay.
The fans for the drives are powered by a PWM-Controller with a temperature sensor. (photo)
Fans: 120 mm PWM PST + 60 mm PWM
The display is not necessary, but it is nice to have.
There is also a version of the front panel without display.
It is an 1,3"-OLED-display with 128 x 64 pixel and an i2c-interface.
The driver chip is a SH1106.
It is connected to the T620 by a Raspberry Pico.
On the Raspberry Pico a program is installed, that turns it into an i2c-tiny-usb adapter.
You can find the software here: https://github.com/Nicolai-Electronics/rp2040-i2c-interface
The Raspberry Pico is connected to an internal USB of the T620.
My python program for the display is not completed yet, but i am confident, that i can
finish it the next weeks and release it on github.
The author marked this model as their own original creation.