Enhancement: Suggestion to use jffs2 Filesystem

[Michael]

I'd like to suggest using nilfs2 as Filesystem for / during installation.
I'm used to flagging the bug type as enhancement for suggestions... found no such possibility though...

[Michael (smart-s)]

Correction... sorry.
Certainly meant to suggest jffs2
http://en.wikipedia.org/wiki/JFFS2

[Gordan Bobic (gordan)]

JFFS2 is for unmanaged flash without wear leveling. SD cards and eMMC inside the AC100 have firmware that handles wear leveling. JFFS2 would not be suitable for this appliction. nilfs2, however, is - I'm using it, but there area few hacks needed to get good performance out of it by managing when nilfs2_cleanerd runs to collect garbage.

[Jani Monoses (jani)]

JFFS2 is meant to run on raw flash block devices, not on SD/MMC which have some firmware already to do wear leveling.
I think your original NILFS suggestion is better. Testing it is pending on nilfs utils with resize support getting a stable release and stabilization of NILFS as a whole.

[Oliver Grawert (ogra)]

nilfs2 is unstable (see the big capitalized warning in dmesg if you load the module), it is in flux and there is no guarantee for backwards compatibility between nilfs2 versions. while it might be fine if you never upgrade, from kernel 2.6.37 on our kernels are packaged and upgradeable in ubuntu, nobody can guarantee that i.e. a switch to 3.0 wont break nilfs2 compatibility.

jffs2 is really old and obsolete, even if we would run our rootfs from NAND there is ubifs for such cases nowadays.