t1hilo has be running centos6 for a few weeks now, here are my notes on
upgrading t1/t2 to centos6 using a restore from t1hilo.

on centos 4, the disk are /dev/hdb
on centos 6, the disk are /dev/sda

Partition setup for disk:
	/dev/sda1   20G   /      for centos4  (or /r1)
	/dev/sda2   20G   /      for centos6. (or /r2)
	/dev/sda3   20G   /aux   catalog, home
	/dev/sda4   rest  /aux1  (unmounted).

Created backup for t1hilo on all partitions in /irtf.backup/t1hilo/120626*

list of mac addresses for the tcs computers:
   t1hilo 50:E5:49:53:F6:FE 
   t1     50:E5:49:35:48:29 
	t2     50:E5:49:53:F6:E4

Restore the /sda1 (root) and make centos6 the default boot image.

1. Boot from CentOS 6 DVD. (.686 32-bit linux).
   boot 'Rescure installed system'
	select rescue method 'Local CD/DVD'.
	enable IP/4 support. ( /24 fr ipv4 prefix)
	start a shell.

	mount irtf_backup
	   # mount -o nolock basking:/irtf.backup  /irtf.backup

	Format /dev/sda2 (centos6 boot partition):

	  # mkfs.ext4 -v -m 3 /dev/sda2   // only centos6 boot disk is ext4.
	  # mkfs.ext3 -v -m 3 /dev/sda3   // this is /aux
	   

2. Restore

   mount your drives
	# mkdir /r2
	# mkdir /aux
	# mount /dev/sda2 /r2
	# mount /dev/sda3 /aux

	restore centos6 root partition:
	# cd /r2
	# restore rvf /irtf.backup//t1hilo/120626.root.zdump

	restore /aux boot partition:
   # cd /aux
	# restore rvf /irtf.backup//t1hilo/120626.aux.zdump

3. setup grub

   # /r2/sbin/grub
	> root (hd0,1)                note: sda2 is hd0,1
	> find /boot/grub/stage1
	> setup (hd0)                 This command install GRUB on MBR
	> quit

4. check:

      /etc/hosts
      /etc/sysconfig/network
      /etc/sysconfig/network-scripts/ifcfg-eth0
      /etc/fstab
      /etc/X11/xorg.conf

 reboot to centos6
   change root passwork (the one based on the host name).
   check IP setting (ifconfig -a ). Run System->Preference->network_connection

5. For t1, install new tcs3.


Stuff I didn't do, but put here for refrence.
----------------------------------------------------------------------------------

 If you have problems with the network, some suggest not using the Network Manager:
   chkconfig NetworkManager off
	services NetworkManager stop
	yum remove /*NetworkManager\*

x. For t1, install new tcs3.

ref:
  nvidia configuring TwinView: ftp://download.nvidia.com/XFree86/Linux-x86/100.14.23/README/chapter-13.html