On Thursday 12 July 2012 01:47:13 S. K. wrote:

> The fault tolerance is one of the important property of a filesystem. Is
> ECC the only mechanism that help to the YAFFS to be fault tolerant?

The ECC is only a small part of it and handles media-level corruptions.

The log structure is a far bigger player in providing robustness.

Many file systems such as FAT have various tables etc than can be left in a 
bad state if updates are interrupted. This can cause the files and possibly 
even the whole file system to be corrupted.

A log structured file system does not have these sorts of tables and what is 
not stored cannot be corrupted.

I suggest you read the Yaffs Robustness And Testing document which can be 
found in a few places including here: 
http://users.actrix.co.nz/manningc/yaffs-docs/YaffsRobustnessAndTesting.pdf

-- CHarles