On 2/14/07, Joachim Backes joachim.backes@rhrk.uni-kl.de wrote:
Can somebody explain this weird behaviour. All comments are welcome.
How the raid is set up accounts for a quite a bit of the performance issues. See the following thread in January's archive about setting up a raid with performance in mind -> http://lists.centos.org/pipermail/centos/2007-January/073893.html
Also, with ext3 and depending on the task, certain mount options will speed things up considerably. Be aware that ext3 is by nature very careful and paranoid about your data, which is why it can be slower. Using these tuning options will speed it up, but at the cost of some of this paranoia. Mounting the filesystem 'noatime' and using 'commit=15' (instead of the default of 5) should also help considerably. You may also wish to try setting 'data=writeback', which will make ext3's journaling behave a bit more like xfs's, though messing with the 'data' mount options should be done with care and testing.