On Sep 7, 2011, at 10:35 AM, Jim Christiansen wrote: > Good morning, David. Thank you for the help and any ideas. My clients are > (year 2006) Dell GX620s with 3.6 ghz p4s and all with 1 gig ram. Better than anything I've got! > > I've never used two nics in any of my other LTSP setups as I had always kept > them behind IPCOP firewalls. I haven't had to apply iptable rules for years > and really don't understand what the 1st history command, #49, is doing. > There is no mention of eth0 or what ever.
> > I don't know who Alkis is, but is he running his setup on a 100 megabit lan? > Could the fat image be slimmed down I wonder? If you ever visit either irc: #edubuntu or #ltsp during the hours of 6 AM and Midnight or beyond, Greek time, you probably have seen 'alkisg' there, and if you have asked for help either place, chances are good that he spent a good bit of time helping you. He's both a dev and a teacher. About the fat image being slimmed, he runs regular Ubuntu (I just asked him on the #edubuntu irc). About the server he says: alkisg:For fat clients, any 5 year old pc with a bit of ram + disk will do [5:17pm]alkisg:The network speed is the greatest asset there [5:17pm]alkisg:For thin clients, you need cpu, ram, network, etc etc [5:18pm] [5:20pm]alkisg:So, if he has some money to spare, tell him to go for 3 gb ram + 2 pci-e gigabit nics for the fat server. [5:21pm] :(for fat server) > > I've just talked to the VP and he says that money is tight to purchase gig > switches. I had been thinking of yanking the 20 100 mbit switches and > swapping in new gig switches. There really needs to be at least 1, gig port, to connect the switch to the server. alkis says of their setup: alkisg:We use switches either with 1 or 2 gigabit ports, or full gigabit switches > > I'll be in a pickle here pretty soon. Thanks again, Jim Good luck! David > > On Wed, Sep 7, 2011 at 8:14 AM, David Groos <[email protected]> wrote: > What hardware are your fat clients running on? Is there a difference in RAM > between the good and poorly functioning clients? I've seen these symptoms > before I upgraded the RAM on all my (Pentium 4's, 2.4-2.8 GHz) fat clients to > 1 gig. > > Alkis insists that a regular PC (with sufficient RAM) works well as the LTSP > server IF you are using fat clients. In his labs the teachers actually uses > the server as their classroom PC! Makes the whole thing more affordable and > practical. > > Do you mind sharing why you chose to use a single NIC setup? > > Good luck, > David G > > On Tue, Sep 6, 2011 at 3:45 PM, Jim Christiansen > <[email protected]> wrote: > Hello, > > I've just had an aging server fail to start up and need to get to the bottom > of another problem on another new server running Ubuntu 10.04 LTSP before > attempting to do another install. We lost one server in the Library late > last June- rgreat timing and another one just today that served my classroom > has failed to start up- Both are 5 years or older. > > My old Centos LTSP server for our Library died near the end of June. My > students had been playing with a new 10.04 64 setup and had it serving 32 bit > fat clients, but really slowly. One of the students altered something in > iptables to make it function and I wonder if this could be the problem. > Grepping my history for iptables shows: > > 49 sudo iptables --table nat --append POSTROUTING --jump MASQUERADE > --source 192.168.1.0/24 > 50 sudo sh -c 'iptables-save > /etc/ltsp/nat' > > This was done, apparently, to allow the system to function with one nic. > > The system is sitting on a 100 megabit network with 26 clients. Only 1/3 to > 2/3 of the clients will boot right off. The others will linger with 4 four > little streaming dots in the middle of the screen for minutes until the log > in screen appears or they fail with errors: > > "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. > INFO: task modprobe:436 blocked for more than 120 seconds. > "echo 0 >... same as 1st line > INFO: task udev-configure-:936 blocked for more than 120 seconds. > "echo 0 > ...same as 1st line > INO: taskhdparm:1020 blocked for more than 120 seconds. > "echo 0 > ...same as 1st line > INFO: task S32ltsp-client-:1027 blocked for more than 120 seconds. > > It doesn't seem any better it I boot fewer clients or more... They just don't > all start up reliably. > > The clients run awesomely once students get logged on. > > Does anyone know what the problem could be? I'm wondering if the natting is > the problem or if I have other issues. > > Thanks everyone, > > Jim > > > -- > edubuntu-users mailing list > [email protected] > Modify settings or unsubscribe at: > https://lists.ubuntu.com/mailman/listinfo/edubuntu-users > > >
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