2019-03 - Guidedog having smartd/sectors. Cloned a new disk to replace the current guidedog
boot disk.

Used GA-B75 motherboard in hilo (same as guidedog) and a new disk.
Make a backup of bigdog (use this to restore since bigdog has a good disk):

Bigdog is:
/dev/sda1              40G  6.2G   32G  17% /r1        (old 6.3 x64 install)
/dev/sda2              40G  7.8G   30G  21% /          (boot disk, 6.6)
/dev/sda3              40G   48M   38G   1% /r3        (empty)
/dev/sda4             341G  3.9G  320G   2% /aux       (empty, so old junk)

Guidedog was similar /dev/sda2 was the boot disk.
Both running  CentOS6.6 2.6.32-504.12.2.el6.i68 

1. make bigdog back in /irtf.backup: 190325.root.zdump
   And do rsync_etc.sh on bigdog, guidedog

2. Using tdtest IP in hilo.
   On tdtest, boot from DVD (CentOS 6.9 i386) into rescue mode.
   NOTE: DVD boot doesn't alway work, but USB works well.
      cntl+alt+f2 for shell (alt+cntl+f6 to return to GUI)
      dd if=/dev/zero of=/dev/sda bs=4096 count=4096  # to wipe an old disk 
   use fdisk to create the partitions:
      /sda1   40GB
      /sda2   40GB
      /sda3   40GB
      /sda4   remainder

   Format the partitions
      mkfs.ext4 -v -m 2 /dev/sda1
      mkfs.ext4 -v -m 2 /dev/sda2
      mkfs.ext4 -v -m 2 /dev/sda3
      mkfs.ext4 -v -m 1 /dev/sda4

3. Restore a backup to /dev/sda2

   mount hnas1:/irtf.backup /irtf.backup      # access denied by server! 
   # so I sftp 190325.root.zdump to /aux/bigdog/ (on /dev/sda4).

   mount /dev/sda2 /r2
   cd /r2
   restore -rf /aux/bigdog/190325.root.zdump

4. change configure to tdtest

   /etc/hosts
   /etc/sysconfig/network
   /etc/sysconfig/network-scripts/ifcfg-eth0  (query current ifcig-eth0 for info).
   /etc/fstab

   /boot/grub/menu.lst - replace uuid with /dev/sdaX

5. reinstall grub

   # grub
   grub> root (hd0,1)  <- sda2 is hd0,1
   grub> find /boot/grub/stage1
   grub> setup (hd0)
   grub> quit

6. after booting into harddisk:

copy over stuff from /irtf.backup/guidedog to /aux/guidedog/
copy over the guidedog ifcfg-eth0 & ifcfg-eth0:1 for the summit.

switch network configuration to guidedog before shutting down disk:
   /etc/sysconfig/network
   /etc/sysconfig/network-scripts/ifcfg-eth0
   /etc/sysconfig/network-scripts/ifcfg-eth0:1