Hi Home Assistant lovers
After upgrading to Pi4 from SSD Boot, the system becomes unstable.
For example, today I can’t take a Snapshot:
Unknown error, see supervisor
20-11-28 19:52:04 INFO (MainThread) [supervisor.auth] Successful login for ‘mqtt’
/usr/lib/bashio/jq.sh: line 26: cannot create temp file for here-document: Read-only file system
Where should I look for the cause of the phenomenon?
Thank you in advance for the hint.
Hi @tumiro
I have upgraded to Pi 4 with hassos 5.8 and boot/run off SSD (no sd card). After a few days I am seeing the same message and history graphs will no longer load.
Did you find a solution or cause for your problem?
I reluctantly transferred the HA to the NUC. In the meantime, I was doing tests with the new 5.8 hassos installation on my pi4 4gb and the effect was encouraging. I do not rule out that I will return to Pi. Due to lack of time, I have to postpone the project. I have no idea what could have caused the previous problems.
Thank you for the prompt reply.
I remembered the commentary during the home assistant conference earlier this month was that the official recommendation for hassos 5.x on RPi is to boot using SDCard and move only the data to USB/SSD. This doesn’t align with my ideal view of how to use the raspberry pi - I would rather have one storage media instead of two, or I would prefer to run via pxe/network boot. However, I’d like home assistant to be performant. The primary reason I moved to SSD and a Pi 4 was to get the USB 3.0 with SSD speeds for loading history graphs. Facing this issue after already being burnt out on USB disk issues with the RPi 3 and 4… I caved and built a new home assistant instance virtual machine on KVM hypervisor. Definitely a lot faster on an x86_64 machine with Xeon processors and SSD. 
Not sure at this point if I’ll ever go back to RPi. The KVM route was super easy, including USB passthrough. I’m hope the experience with your NUC is similar!
In another location, I have a HA installation on a pi3 + with SSD. 4 months have passed and everything works as it should. I get messages via Telegram. Access via VPN. However, it is a very limited system with low requirements but with minimal power consumption.
Here I have more needs. The system is stable and responsive enough, and I guess I’ll stick to NUC though. Merry Christmas to you and all readers.