I use some Pis for various things in my house including Zeroes through CM4s and 4Bs. The Zeroes run Raspbian configured with the read-only filesystem option. I

I use some Pis for various things in my house including Zeroes through CM4s and 4Bs. The Zeroes run Raspbian configured with the read-only filesystem option. I have found it necessary to uninstall `unattended-upgrades` because the overlayfs employed for read-only root caches disk writes in RAM and the update/upgrade process exhausts RAM. For the same reason I disable swap. It makes no sense to swap to RAM on a 512GB system. Upgrades are tedious since they require disabling overlayfs, rebooting, upgrading, rebooting, and enabling overlayfs. I wrote Ansible playbooks to perform these tasks. (https://github.com/HankB/Ansible/tree/main/Pi https://github.com/HankB/Ansible/tree/main/Pi) I have a Pi 4B performing as a file server and running Debian (not Raspbian) It boots from an SD card so that the entire HDDs can be used for a ZFS pool. To reduce wear and tear on the SD card I have mounted `/var` to a ZFS filesystem. I should probably use `tmpfs` for `/tmp`. I use a Pi CM4 to run HomeAssistant and that boots and runs from an NVME SSD where durability is less an issue.