Hi All, I'm running Edubuntu 10.01 with 10 thin clients in a school. I started with 3 GB on the server, but when thin clients surf the web with Firefox (and Flash) they sometimes hanged. If you need surfing and office applications (OpenOffice Java based) you need a lot of RAM. I have solved all my problems installing 8 GB ram on the server.
Giacomo (Italy) 2012/5/21 David Groos <djgr...@gmail.com> > Building on what Mike says, I first used Edubuntu 8.04 (Hardy) with thin > clients. The clients were P3's @900 MHz (I believe was the speed--and > 256-384 Megs RAM) and the server a Dual Core Xeon @ 2.0 GHz, I think, and > with 3 Gig RAM and RAID 5. Things worked great until I used Flash or even > worse, when I used a java-based app, "CmapTools". These apps quickly > brought the server to a standstill--not acceptable. > > The next year I upgraded from thin-clients to Local-apps, running Firefox > and CmapTools as localapps and I was very satisfied with that, except I > wanted to use some USB devices and there is some strangeness with what > "local" means with local-apps. I believe I had upgraded some of my clients > to P4's but things were mixed, but I had upgraded all clients to 512 Megs > RAM. > > The next year, I moved to fat clients so as to get that local support. I > was able to upgrade all my clients to Pentium 4's, with 1 gig RAM. Over > that year I found that I didn't want *less than* a P4 running @ 2.2 GHz. > This was running Lucid. Things were great :) > > This last school year I've not been in the classroom though am supporting > 2 teachers who are using these systems and made no changes and all has gone > well. Next year I expect I'll be running 12.04 again as fat clients. > Since ALL processing is offloaded to the client machines, you no longer > need server-level hardware, according to alkisg, and you simply use a > dual-core desktop. He says in Greece the classroom computer labs use the > teachers desktop as the fat-client server and that the clients use only 512 > Megs RAM! Nice. If you want more detail on this perhaps he could tell you > his setup though may already have it published somewhere. > > Also, I remove Hard drives as well. I run up to 40 fatclients with a 2.8 > GHz, 2, dual-core Xeon (4 cores) and 6 gigs ram and RAID 5. I have 2, 24 > port, 10/100 duplex switches that have 2, 10/100/1000 server ports through > which I daisy chain 1 switch to the other. The server uses the 2-nic setup. > > Good luck, > David > > On May 21, 2012, at 7:42 AM, Mike Biancaniello wrote: > > When a user logs in from a thin client, it is as if he/she is logging > directly into the server. Any user accts/home dirs that exist on the > server are accessed via thin client, so it never matters which client a > student uses. You can lock down a good amount and you just do it on the > server. The experience does not change from one thin client to another. > > All a thin client does is log into the server and act like a remote > terminal. All applications run on the server, hence the very low > requirements for the clients. > Local apps allow spcified apps to run on the thin client, which increases > the req specs for the clients, but offloads some load from the server. If > you have clients that are more powerful, you can run those as 'fat clients' > where almost everything runs on the client. > > As far as a processor, the bigger, the better. > See the installation guide for server and client specs. > <http://edubuntu.com/documentation/12.04/installation-guide> > http://edubuntu.com/documentation/12.04/installation-guide > Edubuntu 12.04 LTS Installation Guide > Requirements and Preparation Installing Edubuntu is easy! We try our best > to explain the installation process in a wa… > > > - *Processor:* Core 2 Duo or Core 2 Quad as recommended minimum. > Simpler CPUs will work, but at a performance penalty. > - *Memory:* 512MB for the server itself, and between 256MB and 768MB > of RAM per client, depending on the demands of the users. Typically, you > would want at least 4GB RAM for 20 LTSP users, and ideally at least 8GB. > Note that you can also use local applications (called local apps) to shed > some memory usage to the thin clients. > - *Disk:* 20GB Depending on options. It's recommended that you keep > the /home partition on fast disks for optimal performance, refer to the > post-install section in this document for more information on setting up a > home partition on RAID. > - *Network:* LTSP can be very demanding on local network resources. It > is recommended that you have at least 1 gigabit connection to the server > for every 15 thin clients, and at least 100mbit connections to the thin > clients from your switches. > > > ------------------------------ > *From*: Jeremy Schubert <jschub...@shaw.ca> > *To*: Mike Biancaniello <mikebi...@aol.com> > *Cc*: edubuntu-users <edubuntu-users@lists.ubuntu.com> > *Sent*: Sunday, May 20, 2012 at 9:55 pm > *Subject*: Re: Creating a school computer lab with edbuntu and ltsp > > Thanks for the info Mike, I will create a virtual machine edubuntu server > to test this all out. But here are a few more initial questions fro you and > everyone else. And I'd appreciate any documentation links. > > 1. Specs for the server? Assume it was hosting 30 thin clients. > 2. I assume that when a client logs in from a machine, their profile > (home?) is loaded onto the server so they can move from server to server. > What is the best way of locking down settings per groups? (For example, > what programs they can access, what happens when they surf the net, how > much access they have to modifying desktops and backgrounds and if those > modifications remain after logging out...) > 3. Can I run batch scripts (or equivalents) to map home folders and other > folders/directories for users to access? > > Thanks, > Jeremy > > ----- Original Message ----- > From: "Mike Biancaniello" <mikebi...@aol.com> > To: jschub...@shaw.ca, edubuntu-users@lists.ubuntu.com > Sent: Sunday, May 20, 2012 5:55:27 PM > Subject: RE: Creating a school computer lab with edbuntu and ltsp > > You really don't need all of the partitions. You can certainly create them > in the install, though. > Personally, I prefer to keep the stuff for which I need RAID to be off on > its own server that just handles that and then use NFS to mount the shares > (SMB if I must share to windows). > > Edubuntu can install the LTSP during the initial install. > The standard install is to have 2 NICs on the server. One on the main > ethernet (access to internet or other stuff like printers, shares, etc) and > one to a private ethernet that hosts only the server and the ltsp clients. > > > You can install the server with only a single NIC, but remember that it > will answer DHCP requests for anything on that network, so if you have > another dhcp server, you would have to edit the edubuntu dhcp config to > only answer for the MAC addresses of the client PCs and ignore all others. > > > The PXE clients don't need any operating system (mine don't even have hard > drives), but you might need to edit the bios to ensure that the NIC is > configured to boot "w/pxe." > > > All of the clients will use the credentials on the edubuntu server to log > in. You can, however, configure the server to use existing domain creds. I > can't give you any info on setting that up, as I use kerberos in my house. > > > I know that's kind of rambled, but hopefully it will help. I can always > answer more pointed questions or clarify if requested. > > > > > From : Jeremy Schubert <jschub...@shaw.ca> > To : edubuntu-users <edubuntu-users@lists.ubuntu.com> > Sent : Sunday, May 20, 2012 at 8:04 pm > Subject : Creating a school computer lab with edbuntu and ltsp > > > Hello there, > I'm used stetting up school computer labs in the following fashion: > 1. A group of client computers running windows xp or 7 > 2. A widows 2003 server with > - 2 NICs > - lots of ram > - a system partition > - a hidden partition for log files > - a data partition for users > - a partition for ISO files and programs that have to eunn from the server. > > 3. Workstations joined ro the domain forcing users ro login with domain > credentials. > 4. Roaming or > mandatory profiles. > 5. Group polocies to enforce certain settings > > I'd like to try the same thing with edbuntu and ltsp. So , basically, can I > > 1. Instal edbuntu on a box with lots of ram and partitions (raid5?) > 2. Then install LTSI > 3. Then star the work stations on PXE mode to connect to the server? > > > -- > edubuntu-users mailing list > edubuntu-users@lists.ubuntu.com > Modify settings or unsubscribe at: > https://lists.ubuntu.com/mailman/listinfo/edubuntu-users > > > > -- > edubuntu-users mailing list > edubuntu-users@lists.ubuntu.com > Modify settings or unsubscribe at: > https://lists.ubuntu.com/mailman/listinfo/edubuntu-users > >
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