On Fri, 20 Jun 2008 at 9:55am, Florin Andrei wrote > Florin Andrei wrote: >> >> Anyway, I did a test with the 2.6.18-93.el5.bz444759 kernel and there's no >> difference: 65 minutes, 27 MB/s. Looks like it doesn't matter which kernel >> I use, at least for this simple test with dd. >> >> I wonder if a test closer to real life, such as reading/writing stuff >> from/to MySQL, would produce different results. I guess there's only one >> way to find out. ;-) > > As a side note, the artificial benchmark reveals a huge difference between > Ext3 and XFS - the latter is much faster when writing. Might be an artifact > of some setting (after all, I do use a hardware RAID card). But the > difference is very real. > > I was planning to use XFS anyway, so I'm not sure if I'll spend too much time > troubleshooting Ext3. > > I don't think this is some kind of hidden effect of the MWI bug. XFS has *always* been faster on 3ware than ext3. RH has never been interested in looking at why. *shrug* -- Joshua Baker-LePain QB3 Shared Cluster Sysadmin UCSF