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 Forum index » Advanced Topics » Cutting edge » Multi-session live-CD/DVD
Multisession DVD
Moderators: Flash, Ian, JohnMurga
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FrankA

Joined: 05 May 2005
Posts: 29
Location: Germany, Europe

PostPosted: Thu 05 May 2005, 15:48    Post subject:  Multisession DVD  

a system without hard disk but with DVD-RW is quite nice because all spinning media go haywire before long when run on a boat due to mechanical stress.

a DVD is off most of the time but gives you 4 GIG download space.

in this scenario it makes sense to create a pup002 or a filesystem mounted R/W on DVD because RAM aint big enough. is that possible already Question
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Flash
Official Dog Handler


Joined: 04 May 2005
Posts: 11068
Location: Arizona USA

PostPosted: Fri 06 May 2005, 00:44    Post subject:  

Hey, Frank.

There's been some discussion of this topic in the original forum here.

Basically, packet writing doesn't look like it would work as well as multisession for this purpose. I could be wrong.
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Lobster
Official Crustacean


Joined: 04 May 2005
Posts: 15117
Location: Paradox Realm

PostPosted: Fri 06 May 2005, 04:29    Post subject:  

It is quite clear that solid state systems are the ideal (keydrive) and Puppy will do this very well when we move to Puppy on phone (one Lobsterian fantasy)

I have found the "Best Puppy" the one I find most useful and satisfying is the Puppy Live CD

The writable multisession pup was an experiment and very interesting. The HD is faster at load but then once you are in, everything is in ram.

The first puppy was designed for flash memory card - the thing is the readers and storage material vary widely. So the most fun Puppy would be on a business card RW/CD?

All Puppy is fun Smile

Last edited by Lobster on Fri 06 May 2005, 11:42; edited 1 time in total
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Flash
Official Dog Handler


Joined: 04 May 2005
Posts: 11068
Location: Arizona USA

PostPosted: Fri 06 May 2005, 10:30    Post subject:  

The hard drives used in iPods seem to be pretty rugged. Smile
Would that work better for you than a DVD, Frank?
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Fenix*NBK*

Joined: 07 Jun 2005
Posts: 6

PostPosted: Tue 07 Jun 2005, 06:47    Post subject:  

I think a live-dvd strategy will be a winning combination !

I also think that we must invest in some neutral tool to make it possible for many distros to master multisession live cds and dvds. Tools such as mklivecd.

mklivecd project:
http://livecd.berlios.de/

-Fenix*NBK*
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Ted Dog
Guest


PostPosted: Wed 17 Aug 2005, 14:32    Post subject: Multi-session DVD  

to start new DVD
from a multi-booted version of 1.04:

growisofs -Z /dev/scd0 -J -R -b isolinux.bin -c boot.cat -no-emul-boot -boot-load-size 4 -boot-info-table /livecd/

extract above file to /root/my-applications and /tmp
next to make the new rc.reboot file return after reboot
add two lines to /etc/rc.d/rc.local

cp /root/my-applications/rc.reboot /tmp
chmod 777 /tmp/rc.reboot

type in terminal
chmod 777 /tmp/rc.reboot
rc.reboot.gz
Description  extract to /tmp and to /my-applications and change /etc/rc.d/local
gz

 Download 
Filename  rc.reboot.gz 
Filesize  5.14 KB 
Downloaded  794 Time(s) 
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Ted Dog
Guest


PostPosted: Mon 12 Sep 2005, 19:39    Post subject: multi-session bad mount in 2.4 not in 2.6 kernel.  

The multi-session DVD > 2GiB seems to be unmountable in the rc.init on the command mount for /mnt/home. The limit does not seem to affect puppy-1.02 (K2.6) using the above scripts with one change I had to hard code /dev/hdb in place of $DEV. I discovered this limit after a few 1.04 puppies DVD where over half full would not mount early but could be mounted in a fully booted puppy of vers 1.02 and 1.04. this may shed some light about the unable to boot Xwindows error.
TedDog
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Ted Dog
Guest


PostPosted: Mon 12 Sep 2005, 21:45    Post subject: 4GiB limit on puppy ver 1.02 multi-session DVD  

Using puppy version 1.02 the new limit was reached. The DVD very near 4GiB boundry gave a new limit
~
Now saving session to burner drive...
Sad next session would cross 4GB boundary, aborting...
...done

Odd note the laptop DVD reader could continue to boot fully but would not see the additional sessions. On any other multi-session CD or DVD it would give the Xwindow usr not mounted error. So some progress there.

TedDog
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Lobster
Official Crustacean


Joined: 04 May 2005
Posts: 15117
Location: Paradox Realm

PostPosted: Mon 12 Sep 2005, 22:14    Post subject:  

Puppy 1.0.5 has a new create ISO and multisession wizard script - News 11 Sep 05 http://www.goosee.com/puppy/news.htm

Assuming this is in the beta please remember to report back if / how this is to be used with DVD

_________________
Puppy WIKI
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Ted Dog
Guest


PostPosted: Mon 12 Sep 2005, 22:46    Post subject: V1.05 Multi-Session DVD  

After reading that same note (not using SCSI is a good thing with DVD burning) in version I downloaded v1.05 beta 2 and came back to get the growiso settings I left earlier to burn a DVD version. My test loading DVD are at the ready. Will report back soon, Ted Dog
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Ted Dog
Guest


PostPosted: Mon 12 Sep 2005, 23:42    Post subject: v1.05 beta2 same issues as v1.04 multi-sessions DVD  

pupy v1.05 beta2 required alot of twists and turns to get DVD multi-sessions working to the same level as v1.04. It still has the problems as the rest of the kernel 2.4 series. I clear think all the issues that keep this DVD and mount problems are related to SCSI and I suspect it will corrupt a good iso using growiso at 2G boundry. If v1.05 SCSI-IDE drivers are removed and only IDE drivers remain I think it will work as good as v1.02 w/ kernel 2.6
Ted Dog
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Flash
Official Dog Handler


Joined: 04 May 2005
Posts: 11068
Location: Arizona USA

PostPosted: Tue 13 Sep 2005, 01:06    Post subject:  

Ted, thanks for the work you've done to get multisession Puppy to work on DVD.

Have you actually been using it for anything, other than to play with and try to get it to work?
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Ted Dog
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PostPosted: Tue 13 Sep 2005, 02:14    Post subject: DVD multi-session useful for backup  

I have some larger than 1G mpeg video files and added them to archives so they never see memory. I've stored every version of puppy in iso and many dotpups. It works just like regular CD multi-sessions but up to 2G on v2.4 and 4G on kernel version 2.6. I just finished getting multi-session DVD v1.02beta2 to only use DVD for the new devf.sfs by adding this to rc.local and copying usr_devx.sfs to /livecd prior to burning to DVD.
----------------------------------------
#this file called from rc.local0
#you can edit this file
#When firewall is installed, will append lines to this file...
#v1.0.5...
ONECD="/dev/scd0"
mount -t iso9660 $ONECD /mnt/home > /dev/null 2>&1
cp /mnt/home/*.sfs /livecd/
sync
USRDEVX=""
if [ ! "`ls /livecd/usr_devx.sfs 2> /dev/null`" = "" ];then
mkdir /.usr_devx
echo "Mounting /livecd/usr_devx.sfs file on /.usr_devx..."
losetup-FULL /dev/loop3 /livecd/usr_devx.sfs
mount -r -t squashfs -o noatime /dev/loop3 /.usr_devx
if [ $? -eq 0 ];then
USRDEVX=':/.usr_devx=ro'
fi
fi
USRMORE=""
if [ ! "`ls /livecd/usr_more.sfs 2> /dev/null`" = "" ];then
mkdir /.usr_more
echo "Mounting /livecd/usr_more.sfs file on /.usr_more..."
losetup-FULL /dev/loop4 /livecd/usr_more.sfs
mount -r -t squashfs -o noatime /dev/loop4 /.usr_more
if [ $? -eq 0 ];then
USRMORE=':/.usr_more=ro'
fi
fi
umount $ONECD
fuser -k -m /usr
sync
umount -r /usr
sync
mount -t unionfs -o dirs=/root/.usr=rw${USRDEVX}${USRMORE}:/usr=ro none /usr
--------------------------------------
having fun next I am going to try to compile from DVD saved source.
Ted Dog
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Ted Dog
Guest


PostPosted: Tue 13 Sep 2005, 02:28    Post subject: puppy DVD multi-session also works on mini-DVD-R  

I tested the DVD stuff on the mini-DVDs and it works well and has double the storage of a normal CD. Nice to carry a pocket puppy!
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BarryK
Puppy Master


Joined: 09 May 2005
Posts: 7047
Location: Perth, Western Australia

PostPosted: Tue 13 Sep 2005, 09:58    Post subject:  

Ted Dog,
What you are doing is extremely interesting.
1.0.5beta will be released soon, and you might like to look at the new remaster-cd script and the iso2cd burner script, see if they can be improved for dvd.
I only have a cd burner, so that's what I write for and test on.
The scripts are only using cdrecord, so that is probably an immediate area for improvement if user wants to burn to dvd.

I didn't even know there are mini-dvds!
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