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Due to some serious performance problems on a server, I've been trying to find information about how the "journaling" ext3 file system works. I haven't found much. In the "man fs" page we find the statement: ext3 is a journaling version of the ext2 filesystem. It is easy to switch back and forth between ext2 and ext3. This isn't very helpful. If you don't know how to do it right, being told that it's easy is not very helpful. In the RH systems I'm dealing with, I've found nothing further on the topic. The basic problem I'm looking at is that the machine will be chugging along, happily running a bunch of processes. Then suddenly they all slow to a crawl, something like 10 to 100 times slower. There are delays of a minute or more in things like writing a tiny file. When this happens, top shows that the processes called "kupdated" and "kjournald" have jumped to the top of the cpu-usage list. Sometimes kswapd is also up there, but usually not, so the problem probably isn't swapping.
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