Back up drive
Back up a linux system to a second bootable drive
- We want to copy all files from the root drive to a new drive.
- We also want to update the boot menu to boot off the new drive.
- We also want to change /etc/fstab on the second drive to use the new root path.
These are the steps for backup of the dune box to the /spiceflow/2.0tb-newmovies/ drive. When we're done, we'll boot from that drive to prove we have a working standby system.
rsync does an excellent job of copying just what we need. Test it with this:
# a (archive mode -rlptgoD) v (verbose) x (don't cross filesystems) h (human-readable) n (dry run) rsync -avxhn --progress / /spiceflow/2.0tb-newmovies/
Do the job with this:
rsync -avxh / /spiceflow/2.0tb-newmovies/ sent 28.10G bytes received 8.64M bytes 15.63M bytes/sec total size is 39.57G speedup is 1.41
There was def some old stuff in there worth cleaning up:
/home/m/development/svn/mythtv... /var/tmp xbmc log files etc
Next we fix /etc/fstab on the new drive to use the drive as root. Original config:
/dev/disk/by-label/d-g2-root / ext3 noatime 0 1 /dev/disk/by-label/d-sp-20newmovies /spiceflow/2.0tb-newmovies ext4 noatime 0 2
New config (remember tho, we lose the 2gb drive):
/dev/disk/by-label/d-g2-root /root-hot-drive ext3 noatime 0 1 /dev/disk/by-label/d-sp-20newmovies / ext4 noatime 0 2
Note: this never worked out for me due to my system's mix of ext3 and ext4. I'll retry once I migrate everything to ext4. Next, grub:
mount /boot em /boot/grub/menu.lst
title ----- linux-2.6.34-gentoo-r11_withext4 root (hd0,0) kernel /boot/linux-2.6.34-gentoo-r11_withext4 root=/dev/sda4
Add a new "standby" entry under it - do a "df" to find the root:
title ----- ==STANDBY== linux-2.6.34-gentoo-r11_withext4 root (hd0,0) kernel /boot/linux-2.6.34-gentoo-r11_withext4 root=/dev/hda1
Then reboot to standby and see what we have... (no "latest" video library etc., but otherwise the same?)