Wearout Prevention of SD card memory

Use USB or NFS as the rootfs for your pi if your are worried about sd card wearout. I don't recommend to mount read only rootfs then use tempfs to save all the changes since pi does not have a lot memory.

Today I tried to setup my system with a /home partition of type udf. That did not work. Accessing the udf partititon was extremely slow and throws lots of error messages like this:

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[   20.013398] UDF-fs: INFO Mounting volume 'home', timestamp 2013/01/02 14:05 (1000)
[   27.650417] mmc0: missed completion of cmd 18 DMA (512/512 [1]/[1]) - ignoring it
[   27.650473] mmc0: DMA IRQ 6 ignored - results were reset
[  105.216183] mmc0: final write to SD card still running
[  115.223636] mmc0: Timeout waiting for hardware interrupt - cmd12.
[  115.224807] mmcblk0: error -110 sending stop command, original cmd response 0x900, card status 0x900

just use ext2 or ext4 without journal and you'll be good.
Using untested fs or fs not intended for flash use (udf) will cause more problems...

IF heavy write is in place, then just use hdd -- problem solved..

Why not use RAMLOG to keep log files in memory? I have several Pi's, all using RAMLOG to minimize writing to the SD card. RAMLOG is available from http://www.tremende.com/ramlog/‎ If the SD led is tobe believed, there is no writing going on.