25 Mar
2005
25 Mar
'05
10:09 p.m.
Am Samstag, den 26.03.2005, 07:17 +1000 schrieb Michael D. Setzer II:
Not sure if this applies to your situation, but this
is what I
have done in recent work to add udpcast as an option with
G4L.
I use G4L to create a image file on my server using lzop
compression.
I can then use
udp-sender --file image --max-bitrate 80m
When I use a max-bitrate higher than 70m, I get lots of Timeout
notAnswered messages. With 70m it seems to work just fine.
What I originally tried on the clients didn't
work, and I got a
reply that worked perfectly.
Why don't you simply use
udp-receiver --pipe 'lzop -d -c -' -f /dev/hda ?
Yep, that's how i tried it the last time. It seems to have worked (it
transfered 25GB in about 1 1/2 hrs), but this was with only 4 receivers.
I hope that I will be able to test this configuration again with 16 or
even 32 receivers, albeit then I wont't be able to cast the whole
harddisk (for the obvious reasons that we need to reactivate Windows on
every machine with a norton ghost walk-disk), just the linux-partition
(which works perfectly out of the box on all clients).
One last issue that I found in making images, is that
clearing out
unused sectors makes a big difference. I did an image of a clean
install of linux on a drive, and it created a 12GB file. I then blanked
out the unused sectors, and got a 2.5GB file.
dd if=/dev/zero of=/0bits
rm /0bits
Yep too, I dit this before the last run, and it reduced the overall size
from 29Gb to 25Gb (where about 17GB is the windows-partition).
I've never used the PXE, so don't know if this
doesn't apply, but it is
things that I found that make the udpcast work great for me.
PXE is just awesome to use - just tell your dhcp-server which client
shall boot the netboot system, restart them, and du a "cssh
root@host{0,1}{0..9}".
I'll possibly look into G4l, but I am not yet convinced that the
copryright-infringement issues are solved.
--
Lukas