show stopper for us: dev nbd0 clients locking up losing connection with server

Scott Balneaves sbalneav at
Fri Sep 12 20:46:34 BST 2008

On Fri, Sep 12, 2008 at 12:38:40PM -0700, john wrote:
> Thanks for the reply Scott,
> > Could you give us a few more specs on the thin clients?  CPU/RAM
> > specifically?
> All thin clients are Ntavo 6030's with 512 MB ram. CPU is a via C3
> Processor running at 800 Mhz
> > Do you have NBD_SWAP turned on?
> I haven't made any changes re: NBD_SWAP so it would be whatever the
> images uses by default. As I mentioned earlier the server is
> configured with 2 Dual-Core AMD Opteron Processor 2218. So I rebuilt
> my thin client images with the 32 bit option
> "ltsp-build-client --arch i386"

OK, first thing I'd do is add in say 256 megs of NBD swap (assuming you've got
the disk space) with something like:


and edit /etc/ltsp/nbdswapd.conf


Also, within the thin client chroot, when they freeze up, can you ctrl-alt-f1
and get the login prompt?  If so, here might be an interesting test:

Set a root passwd in the chroot:

chroot /opt/ltsp/i386

Rebuild your image, then if you get a latch-up, c-a-f1 to the text login, go in
as root, and use the free command to see if you've run out of ram, and run
dmesg to see what the client thinks is going on.

Let me know.


Scott L. Balneaves | "There are many causes I am prepared to die for,
Systems Department |  but no causes I am prepared to kill for."
Legal Aid Manitoba |    -- Mohandas Karamchand Gandhi

More information about the edubuntu-users mailing list