Where to get DAR (Disk ARchive)

• DAR for Linux
  • At http://dar.linux.free.fr/

Compiling and Installing DAR on Linux

• To extract the install file, grab the latest tar.gz file from the Apache website and type gzip -d < dar.tar.gz | tar xvof -

• Go into the dar subdirectory and then do:
  • ./configure
  • make
  • Then as root: make install (this installs into /usr/local/apache2)
  • done!

• Now for the more tricky part of configuration.

Creating a backup in DAR

May 2002: still working out if best to format the DVD-RAM discs in UDF format so that the disk can be read on other DVD-RAM drives installed on different operating system (UDF utilties are still kludge prone under Linux by the looks)

• udftools for Linux
  • At http://packages.debian.org/testing/otherosfs/udftools.html
  • At http://linux-udf.sourceforge.net
  • mkudffs - Format a device, creating an empty UDF filesystem
    • mkudffs --media-type=dvdram /dev/hdd

  • cdrwtool - Low-level drive management (e.g. set writing speed, format)
  • pktsetup - Set up a packet writing device (/dev/pktcdvd0) for a drive

    • cdrwtool -d /dev/hdd -q
      pktsetup /dev/pktcdvd0 /dev/hdd
      
      mount -t udf /dev/pktcdvd0 /mnt
       ...
      umount /dev/pktcdvd0
      pktsetup -d /dev/pktcdvd0

  • Make sure you have the following in the Redhat 7.3 /etc/rc.d/rc.local

    # Get the system able to read DVD UDF packet writing format
    # cat /proc/filesystems will check that this is being used
    
    /sbin/modprobe udf
    
    

  ---

  backing up the /web_logs partition area

  Insert a 4.7Gig DVD-RAM disk (though is ~4.3 Gig in computer size) in the DVD-RAM drive and as root mount it:

  Then format the disk using (still got to decide if worth getting UDF format and tools working):

  mkudffs --media-type=dvdram /dev/hdd

  (Old Linux partition type: mke2fs -b 2048 /dev/hdd)

  mount /dev/hdd /storage/dvd

  To create the backup then type:

  dar -c /storage/dvd/web-logs -s 4270M -p -b -z -R /web_logs -X "*.dar"

  Or if a smaller disk:

  dar -c /storage/dvd/web-logs -s 2100M -p -b -z -R /web_logs -X "*.dar"

  (dar will prompt when the disk is full - do a [control] Z to stop the program, unmount the old DVD-RAM disk; format the disk using mkudffs --media-type=dvdram /dev/scd0; then mount the DVD-RAM disk (mount -t udf /dev/sdc0 /storage/dvd); and then type fg to get back into dar and continue.

  To check the DAR archive:

  dar -l /storage/dvd/web-logs

  ---

  backing up the /web_disc partition area

  Insert a 4.7Gig DVD-RAM disk (though is ~4.3 Gig in computer size) in the DVD-RAM drive and as root mount it:

  Then format the disk using (still got to decide if worth getting UDF format and tools working):

  mkudffs --media-type=dvdram /dev/hdd

  (Old Linux partition type: mke2fs -b 2048 /dev/hdd)

  mount -t udf /dev/hdd /storage/dvd

  (Old Linux partition type: mount /dev/hdd /storage/dvd)

  To create the backup then type:

  dar -c /storage/dvd/web-data -s 4300M -p -b -z -R /web_disc -X "*.dar"

  (dar will prompt when the disk is full - do a [control] Z to stop the program, unmount the old DVD-RAM disk; format the disk using mkudffs --media-type=dvdram /dev/scd0; then mount the DVD-RAM disk (mount -t udf /dev/sdc0 /storage/dvd); and then type fg to get back into dar and continue.

  To check the DAR archive:

  dar -l /storage/dvd/web-data

  Notes

  -S 2200 - if the first DVD is smaller than the rest

  -P /storage/dvd (only if / - so as not to backup the backup disk; not applicable as Mondorestore is the system disaster recovery system)

Configuring DAR for Restore

If a complete disaster, run Mondorestore to restore the Linux system back on the IDE system disk.