Udpcast July 2008

udpcast@udpcast.linux.lu

5 participants
8 discussions

throttle output of udp-cast
by David Crider 23 Sep '08

23 Sep '08

Is it possible to do dynamically throttled UPDcast transmission? We need to throttle the data flow to a Logic Innovations IP encapsulator (with LI's documentation attached with their permission). The udpcast mutlticast address is considered a single route to the IPE. The IPE sends out flow-control messages (described in document) that shows how many bytes are available for traffic for each route every 100 milliseconds in a multicastand comes from a user specified multicast of its own. Attached is the LI document, again with the manufactures permission. Also, you can contact Theo Aukerman, taukerman(a)logici.com for any additional info. I'm asking these questions because IF this is possible, then this would be an almost complete framework for an open source Data-casting network, and can be used for over the air data-broadcasting from any DTV transmitter or any other system with null packets. I currently work as an engineer for a TV station that does data transmission, but would like to move to an open source model.

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Sender's timeout for waiting for receivers
by Dmitry Popov 23 Sep '08

23 Sep '08

Hi everyone, Please confirm my guess (or explain how to implement it). I need a "sender-timeout", a period of time while sender waits for receivers to connect, and if none are connected - sender exits without transmission. The only way to implement this is shell/perl/... script, which starts udp-sender with --min-receivers option and monitors its stderr. If no "Starting transfer" is found during specified period of time - it kills udp-sender process. Regards, Dmitry

2 1

Request - include netcat
by brian＠polibyte.com 23 Sep '08

23 Sep '08

Hi, It would be nice if netcat were included in the CD and PXE images. Busybox has a version, so adding it shouldn't take much. All the best, Brian

2 1

incorrect documentation of --nosync flag?
by George Coulouris, MSD 11 Sep '08

11 Sep '08

http://udpcast.linux.lu/cmd.html states that --nosync is the default when writing to a file or a pipe, but this does not appear to be the case; I verified with strace that udp-receiver open()s its output file with O_SYNC unless you specify --nosync.

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Timeout errors in UDPcast
by Brent Putnam 31 Jul '08

31 Jul '08

Running SuSE SLES10/SP2 and an image of about 17GB. When multicasting clients, performance appears to suffer from a excessive number of timeouts and/or retransmits. If the images are smaller this is not a problem, but we currently need them this size. The errors appear frequently: Timeout notSnasweed=[1] notReady=[1] nrAns=2 nrPart=3 avg 10193 We added the configs of rmem_default and rmem_max in the /tftpboot directory substructure in init.d for the client. It does seem to affect the speed, but still winds up bombing out on the big partition (~17GB). It's an IBM blade center w/SAS drives which do not have cache. TIA, Brent

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clonezilla, drbl and udpcast
by allcoms 24 Jul '08

24 Jul '08

Hi udpcast list! I work as an IT technician and certainly one of the most invaluable tools for my line of work has become the excellent open source cloning app Clonezilla. I have found it many times faster than ghost in creating images of NTFS partitions as well as being more reliable in many cases too. AND its FOSS so- very cool tool indeed! Clonezilla has a server-side counterpart app called drbl (diskless remote boot Linux). drbl is still in beta but when its finished it aims to provide functionality similar to Ghost Server, as found in Ghost Solution Suite. drbl uses udpcast to do its broadcasting of images over a network and the easiest way for people to try out drbl is to download drbl-live from http://free.nchc.org.tw/drbl-live/testing/ http://free.nchc.org.tw/drbl-live/unstable/ or http://drbl.sourceforge.net/download/sourceforge/ I can't wait to be able to totally replace Ghost with clonezilla/drbl, but I'm unable to switch from ghost server to drbl for 2 reasons 1- drbl-live server setup script/ ncurses GUI currently presumes you have multicast capable hardware and doesn't offer a mode to utilise udpcasts -brdcast mode easily yet but the author says he'll think about adding this capability. 2- drbl-live also requires that you either enter a specific time to wait or number of clients that have to connect or both. In my experience with using ghost server to image many machines you will know how many machines you WANT to image but you don't know how many of them will actually be able to connect to the server due to hardware failures and also you don't know just how long it will take to get all the machines connected to the server. Hence, I want drbl-live's Clonezilla server setup script to be able to work just like gs in that after setting the network settings and selecting the image to be broadcast etc. I would just select 'Listen for clients' or whatever. Then I would have an indefinite amount of time to run around and TRY to get everything connected to the drbl server. As each client connects to the server, it would get registered on the drbl console. When I've connected as many machines as possible, I would just be able to hit a key to start the broad/multicast. Setting a definite amount of time to wait or number of machines wouldn't work for me! The author of clonezilla and drbl has told me that #2 isn't do-able because this isn't supported by udpcast. Is he mistaken? Thanks for your help! Dan

2 1

Intel 82566 NIC driver
by Raymond Langley 21 Jul '08

21 Jul '08

I too am looking for the 755 alpha build do you have a link to it? http://udpcast.linux.lu/pipermail/udpcast/2008-January/000807.html Raymond Langley IT Specialist, Information Technology Services Phone: (705) 759-2554 ext. 2786 _______________________________________________ Udpcast(a)udpcast.linux.lu https://lll.lgl.lu/mailman/listinfo/udpcast

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Problem cloning Dell latitude laptops
by Mathieu Adoutte 05 Jul '08

05 Jul '08

Hi, I'm trying to clone several dell latitude laptops, but I can't seem to find the correct driver for the hard drive (when i pick the default choice, I get only "Other" in the partition list). Is there a way to locate the correct one ?

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Udpcast July 2008