On 13.11.2013 11:36, Götz Reinicke - IT Koordinator wrote: > Hi, > > I'm testing a storage system and different network settings and I'm > faced with a strange phenomen. > > Doing a mkfs.ext4 on the centos server lasts 11 minutes. > > The same mkfs.ext4 command on the debian installation is done in 20 seconds. > > It is formatting a 14 TB 10Gbit ISCSI Target. > > It is the same server. Centos and debian are installed on different > internal harddisks. > > Any explanations why debian is so f*** fast? Any hint? Is it possible that you use a relatively recent debian version compared to the older centos 5/6 versions available? If so you might want to look into the "lazy_itable_init" option for mkfs.ext4 which is probabaly used in the debian case but not the centos case (but will probably be used in RHEL7). Regards, Dennis