steps: how to backup on DVD in RHEL4?

[shamuk80]

Hi all,

Can any body check, the steps to take the data backup on DVD.
please make corrections if I am missing some thing. or any other way to do this. All I need to take backup of .tar.gz files to DVDs.

I have installed dvd+rw-tools.

1. dmesg
The last few lines of /var/log/dmesg ( just wanted to know where this device is attached )

sr0: CDROM (ioctl) error, command: Xpwrite, Read disk info 00 00 00 00 00 00 00 02 00
sr: old sense key No Sense
Non-extended sense class 0 code 0x0
usb 1-1: new high speed USB device using address 4
scsi3 : SCSI emulation for USB Mass Storage devices
Vendor: FREECOM_ Model: DVD+/-RW20J6 Rev: 9F51
Type: CD-ROM ANSI SCSI revision: 02
sr0: scsi3-mmc drive: 48x/48x writer dvd-ram cd/rw xa/form2 cdda tray
Attached scsi CD-ROM sr0 at scsi3, channel 0, id 0, lun 0
USB Mass Storage device found at 4
cdrom: This disc doesn't have any tracks I recognize!

Question:
Is this attached to sdc1 or sr0 ?? (Attached scsi CD-ROM sr0 at scsi3)



2. cdrecord -scanbus

Cdrecord-Clone 2.01-dvd (i686-pc-linux-gnu) Copyright (C) 1995-2004 Jörg Schilling
Note: This version is an unofficial (modified) version with DVD support
Note: and therefore may have bugs that are not present in the original.
Note: Please send bug reports or support requests to http://bugzilla.redhat.com/bugzilla
Note: The author of cdrecord should not be bothered with problems in this version.
Linux sg driver version: 3.5.27
Using libscg version 'schily-0.8'.
cdrecord: Warning: using inofficial libscg transport code version (schily - Red Hat-scsi-linux-sg.c-1.83-RH '@(#)scsi-linux-sg.c 1.83 04/05/20 Copyright 1997 J. Schilling').
scsibus2:
2,0,0 200) 'FREECOM_' 'DVD+/-RW20J6 ' '9F51' Removable CD-ROM
2,1,0 201) *
2,2,0 202) *
2,3,0 203) *
2,4,0 204) *
2,5,0 205) *
2,6,0 206) *
2,7,0 207) *


Question: Can any body tell me why we get output different when i run this command? like

scsibus2:
2,0,0 200) 'FREECOM_' 'DVD+/-RW20J6 ' '9F51' Removable CD-ROM

scsibus3:
3,0,0 300) 'FREECOM_' 'DVD+/-RW20J6 ' '9F51' Removable CD-ROM


3. mount -r -t iso9660 /dev/hdc /media/cdrecorder


4. To create the ISO image.

# mkisofs -r -o /tmp/home-backup-disk1.iso /home/backup

5. Now use the growisofs command to write the ISO onto the DVD.

# growisofs -Z /dev/dvd=/tmp/home-backup-disk1.iso


Will these steps work??




I was looking on some site where these commands were mentioned

Backup a directory to a CD:
One step: mkisofs -r -R -J -l -L /home/user1 | cdrecord dev=0,4,0 -v --eject speed=4 -
or the two step variation of the process:
mkisofs -r -R -J -l -L -allow-multidot -o /tmp/backup.iso -graft-points "/home/user1=/home/user1"
cdrecord dev=0,4,0 -v --eject speed=4
Make sure directory does not hold more than CD capacity (700Mb typically). Check with the command: du -s /home/user1


Can any body explain the abouve bold and italic lines ??

tell me which way is good the steps i wrote or these commands? what if i need to use the blank part of the DVD again?

waiting for an earlier response.

Thanks.