On Tue, Apr 19, 2011 at 2:29 PM, Scott Silva <ssilva at sgvwater.com> wrote: > on 4/19/2011 11:16 AM Scott Silva spake the following: >> on 4/19/2011 10:42 AM Matt spake the following: >>> On a running 64 bit CentOS 5.6 box is it possible to convert from Ext3 >>> to Ext4 to improve performance? Right now I can deal with a few hours >>> of downtime on it. This is an email server with lots of I/O due to >>> seek time. Software RAID1 as well. Will Ext4 offer much of an >>> improvement? >> http://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/96/html/Migration_Planning_Guide/ch03s02.html > I know it is for RH 6, but probably sound advice. I converted my file server to ext4. The conversion went smoothly, but I highly recommend making a backup. You need to first turn on the ext4 features then run fsck to finish the process. The conversion takes as long as a fsck takes on ext3. tune4fs -O extents,uninit_bg,dir_index /dev/ e4fsck -yfDC0 /dev/ Ryan