On Tue, Nov 16, 2010 at 12:10 AM, Asmo Koskinen <[email protected]> wrote: > 15.11.2010 21:59, Jeff Wheeler kirjoitti: > >> http://www.arkki.info/howto/Wiki/DRBL_LTSP/DRBL/02.png >> >> Thanks, this is rather interesting. :) > > For VDPAU (Lucid) you need some extra sources for fat client. Both DRBL > and LTSP needs this. > > ppa:nvidia-vdpau/ppa > ppa:rvm/mplayer > > With LTSP you can use thin, thin+localapps and fat clients. And you can > use 64-bit environment in server side and 32-bit environment in chroot. > LTSP is very flexibility that way. >
Yes this is really a good advantage of LTSP fat clients. > With DRBL you can't use thin clients or 64-bit environment in server. > DRBL is just for fat clients and needs 32-bit environment in server. > DRBL does have a simple forwarded X connection ability using xdmcp but it has no sound or local device support like LTSP. > But after that both gives you same support for heavy GPU based programs. > Yes but it's not enough to measure one or two app performance on a single client. Remote filesystem performance and scalability is also important. It seems, the main difference (DRBL/LTSP) is the remote filesystem mounting (nfs/sshfs) and LDM/NIS. >From what I've read, nfs has lower level filesystem support that is more scalable and fault tolerant in a multi-user environment (but maybe less secure). Btw DRBL uses nfs over tcp if it can. But I have not tried Edubuntu's fatclient mode so I cannot compare. But I can report ~20 students simultaneously installing Ubuntu into a Virtualbox VM from 1 ubuntu iso file in /home. So each students VM loopback mounts that 1 iso file over nfs and installs to their own /home dir back over nfs (thank goodness for full duplex connections). I should have recorded that. (next time) But I have something else: Here is a video of WOL boot for a class (30 systems). DRBL 64 bit (Oct 2009) Server: Dual Quad core (raid 10, 24GB, eth1+eth2 Gbit DRBL LAN) 31 diskless client systems in lab (Dell Optiplex 760 E1400 Celeron 2GB eth0=100Mbps) 1 system used for recording video (notice eth2 starts with ~2MB/s, that's recordmydesktop load) WOL boot all 30 systems. Notice hard disk is usage is very low (NFS caching). http://www.youtube.com/watch?v=b2AKUme5dQQ -- Robert Arkiletian Eric Hamber Secondary, Vancouver, Canada -- edubuntu-users mailing list [email protected] Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/edubuntu-users
