Filesystem for custom app usage

[EG]

I want to store a small sqlite db to use in my custom app. Which filesystems are available for me to do so? Which would not be wiped at boot and/or firmware upgrade?

I can use /var/config, but I see there is much more space in some of the others, I just don’t know if they are appropriate for this use.

Filesystem                Size      Used Available Use% Mounted on
/dev/root               232.0M    176.3M     55.7M  76% /
devtmpfs                115.2M      8.0K    115.2M   0% /dev
proc                         0         0         0   0% /proc
sysfs                        0         0         0   0% /sys
debugfs                      0         0         0   0% /sys/kernel/debug
tmpfs                   123.3M    784.0K    122.6M   1% /run
tmpfs                   123.3M      3.7M    119.6M   3% /var/volatile
configfs                     0         0         0   0% /sys/kernel/config
/dev/mtdblock6            8.0M      3.5M      4.5M  44% /var/config
/dev/mtdblock7            8.0M    512.0K      7.5M   6% /var/oem
cgroup                       0         0         0   0% /sys/fs/cgroup
devpts                       0         0         0   0% /dev/pts

Thanks,
EG

[Jason Reiss]

How much space do you need?

The /var/oem partition is 8MB and survives reboot and firmware upgrades.
It is only used if you back-up settings to be used as custom factory default settings.

Only /var/config/ and /var/oem will survive a firmware upgrade.

[EG]

Hmmm. I just tried to create a directory on /var/oem both with and without sudo and it said it’s a read-only filesystem. I could change /var/oem, but then I worry about it reverting in a firmware upgrade.

/dev/mtdblock6 on /var/config type jffs2 (rw,relatime)
/dev/mtdblock7 on /var/oem type jffs2 (ro,relatime)

[Jason Reiss]

Only /var/config/ and /var/oem will survive a firmware upgrade.
You will need to test if either will work for your requirements.

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