Hey we are running debian off of an SD card and want to know what's best for /var?

- Plenty of room on 2GB SD card, so do we, make /var as large as possible (everything else is read only) to reduce block overwrites, or do we make /var as small as possible, hopefully reducing the load 'pdflush' places on the 200 Mhz system?

That said, why not ext2? Is there damage that can happen in /var due to insta-crash or power loss that will prevent proper system function? We heard ext4 is more optimized, but ext4 on 2.6.29, not sure.

If we must use a journaled file system for /var, then which is lowest load on system, or "better": jfs, ext3, jffs2 ...

Thank you so very much!

Greetingz!

Gosh, running /var on an SD card?? What read/write speeds are you seeing on it? (I've never seen more than around 1MB/sec, thanks to the SD forum's proprietary "hi speed" access B.S.)

I would recommend JFFS2, as it's been around since 2002, and has been pretty stable in the few embedded-Linux setups I've used it in.

There's also LogFS, which is/was supposed to replace JFFS2. It supports "bigger" devices (64MB to 512MB). It's been "experimental" in the 2.6 kernels as of May 2010.