[LEDE-DEV] Advice on filesystem for x86 (CF card)

[Sebastian Fleer]

On 11.04.2018 14:48, txt.file wrote:
> There is no need to create a bigger squashfs as squashfs is read-only.
> With squashfs you get two file systems. squashfs for the files in the
> image and jffs2 for changed/added files. During the first boot the jffs2
> is created. It starts after the end of the squashfs until the end of
> device. The good point is that you have some failsafe mode where you
> ignore the jffs2 and only load the squashfs. Then your device has the
> same behavior as directly after flashing.
> 
> With ext4 you get a single read-write file system (which makes failsafe
> difficult).
> 
> This is how ar71xx works and I expect x86 does the same. If I am wrong
> correct me, please.

I have an APU2 with OpenWrt (build from git master) installed on a 16GB 
mSATA drive. The overlayFS is only the size of TARGET_ROOTFS_PARTSIZE 
(256 MB in my case).

# df -h
Filesystem                Size      Used Available Use% Mounted on
/dev/root                 7.0M      7.0M         0 100% /rom
tmpfs                     1.9G    560.0K      1.9G   0% /tmp
/dev/loop0              247.0M     15.3M    161.7M   9% /overlay
overlayfs:/overlay      247.0M     15.3M    161.7M   9% /
/dev/sda1                15.7M      3.2M     12.2M  21% /boot
/dev/sda1                15.7M      3.2M     12.2M  21% /boot
tmpfs                   512.0K         0    512.0K   0% /dev

So it does seem to work differently on x86.