CentOS 6 Differences

Contents 1 KVM 2 General 3 Just plain interesting 4 New Tools 5 virtual fs changes of note 5.1 sys 6 THP Transparent Huge Pages

KVM

• Getting vmware server 1.x to work in KVM

• Fire them up as Linux and default 2.6 kernel NO CHANGES NEEDED to run. Converting to a faster file type and swtiching to virtio for network adapter recommended.

General

• portmap is replaced with rpcbind

Just plain interesting

• /etc/modprobe.conf becomes /etc/modprobe.d/
• udev takes over your NICS ! check /etc/udev/rules.d/70-persistent-net.rules

New Tools

• iotop

virtual fs changes of note

sys

• /sys/kernel/mm/redhat_transparent_hugepage

THP Transparent Huge Pages

• Ways to debug

• http://sourceware.org/systemtap/wiki/WSRHEL6HugePages

• sysfs control

•  :* /sys/kernel/mm/redhat_transparent_hugepage