I recently installed OpenWrt 18.06.4 on my router, and root partition has 12M available while /temp has over 60M
Filesystem Size Used Available Use% Mounted on
/dev/root 2.5M 2.5M 0 100% /rom
tmpfs 61.0M 752.0K 60.3M 1% /tmp
/dev/ubi0_1 14.0M 876.0K 12.4M 6% /overlay
overlayfs:/overlay 14.0M 876.0K 12.4M 6% /
tmpfs 512.0K 0 512.0K 0% /dev
Since I'm new to openwrt can someone help me to understand how can I add more space to root.
Thanks in advance
You will notice that /tmp is tmpfs filesystem which resides in RAM. You can't use that for permanent storage. Data is lost after every reboot.
You will notice that / and /overlay are similar and are the overlayfs which reside in flash. You can read about overlayfs in the wiki
You can run
dmesg to see the partition layout. Don't think you can do much as a user to change size
If your looking to increase storage size read this