What dvd writers are Fedora compatible?
Stewart Nelson
sn at scgroup.com
Sat Aug 7 00:49:10 UTC 2004
Hi Roger and all,
> I have an LG DVD writer, but haven't been able to reliably do data backups
I am setting up some systems using DVD-RAM for backup. I haven't had any
trouble yet, but your comments make me very nervous. Do you get I/O
errors? System problems? Corrupted backup media with no error detected?
Or is it just the samba problem that you already mentioned?
> I have like 4GB data to backup daily and I make 1 single big tar that
> then convert to iso file
On my system:
tar -cf /dev/cdrom1 stuff
works just fine (with DVD-RAM media). There are two disadvantages:
You couldn't easily read the backup on another platform, and you can't
put more than one tar on a disk.
> Should I split the tar in smaller files ?
IMO that wouldn't help (and you'd need multiple DVDs if you used the
method above).
You could format the DVD-RAM as a UDF filesystem, and could then
write multiple files to it with tar, just like a hard drive.
> can anyone pls post the mkisofs and cdrecord command lines that you are
> using, or the script file you use for data backup for DVD ?
Sorry, have not used either of those programs.
> also I noticed that while Linux is burning the DVD I cant access the
> samba shares. after the DVD is finished burning I get all working back.
>
> I am using 2 HD mounted as master on each controller with software RAID1
> configuration and the DVD is mounted as slave with one of the disks
>
Try connecting the DVD to a separate controller (on motherboard or a
PCI card).
I am using a Matsushita (Panasonic) DVD-RAM SW-9572. It can accept
RAM media in cartridges, which IMO will provide better long term
reliability, especially if your operators handle disks carelessly.
Like most DVD-RAM drives, the firmware reads the data after it is
written, and reallocates sectors if the readback does not show
a sufficient margin of additional error correction capability.
The measured throughput of the SW-9572 is about 1.6 MB/second
on writes, 4.0 MB/second on reads.
--Stewart
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