Since the system default is running ext3 the journal file system in FC2 and now are still using in FC3. Is it a safety file system ?
Becuase I saw the books didn't stated the different and what would it happen if the system crash in ext2 or ext3 ?
Ringo
Ext3 has journaling. What this means for you is that the system journals disc activity so as if somethin' horrible happens; let's say a power failure in the middle of a disc write or something like that, then the journal will ease recovery. The journal allows the system to replay the last actions taken up to the point of failure and then continue on as if nothing ever happened. Ext3 is the default for Fedora.
Ext2 is the exact same file system basically, other than it lacks journaling. What this means for you is if the machine dies in the middle of a disc write; as mentioned above, the machine will have to fsck the disc. This can be a very long and arduous process in comparison to the replay of a journal in ext3. On the other hand, ext2 is much faster than ext3 simply because it lacks the journaling system. If you want to know which one to choose, use ext3.
If you're worried about speed, I don't think it's going to be something you notice too too much. Ext3 can be tweaked to provide better speed, if mounted with certain options. What those are, is best found by googling or searching the archives. I've seen those mentioned here before.
A good source to find this information out is by using google too. If you want a real break down of it, google can provide you with an indepth discussion on the matter from developers and benchmarks.
HTH
Alex White
