![[Home]](/wiki.png)
You can only use the server's DVD writer if you are logged on the server. To do that use ssh server from the machine you work from (and then use your password to login). The files to be backed-up must be on server's disk. If your data are inside the /work directory, fear not : the /work directory is accessible on the server's /tmp. To make this clear : if the directory /work/myself/2backup contains the data you want to back-up, then do (after logging-in to server) cd /tmp/myself and you should see your files and directories.
- You should never try to back-up data from the /work directory. Always access the data via server's /tmp directory.
- Do not use DVD+R disks. What you need is DVD-R disks. Double-layer disks have not been tried, and it is not known whether they can safely be used for back-up.
Preparing a 'closed' (not multisession) DVD
sudo growisofs -Z /dev/scd1 -R -J -udf <files>
where files can be a single file (say, a tar archive), or the name of a directory.
Be careful : Single layer DVDs can fit a maximum of 4,700,000,000 bytes (~4.4 GBytes). BUT, no single file can be larger than exactly 4 GBytes (4,294,967,296 bytes). If you want to write a file which is larger than 4 GBytes you will have to split it (using for example split, or in the case of DCD files, catdcd).
To confirm that everything has been written correctly :
mount /mnt/dvd cd /mnt/dvd diff <file1> /tmp/mydir/<file1> diff -r <dir1> /tmp/mydir/<dir1>
Preparing a multisession DVD
NOTE WELL : No file should be larger than 2 GBytes
For the first session (the first time you write something) use :
sudo growisofs -Z /dev/scd1 -R -J <files>
where files can be a single file (say, a tar archive), or the name of a directory.
For all the other sessions, use :
sudo growisofs -M /dev/scd1 -R -J <files>
To confirm that everything has been written correctly :
mount /mnt/cdrom1 cd /mnt/cdrom1 diff <file1> /tmp/mydir/<file1> diff -r <dir1> /tmp/mydir/<dir1>