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

Scott Balneaves sbalneav at
Mon Sep 15 20:07:50 BST 2008

On Mon, Sep 15, 2008 at 11:54:28AM -0700, john wrote:
> Scott et al.
> When I set the swap options you mentioned It hung worse than ever. I
> wonder if the problem lies with swap. I have
> 512 Mb ram on the clients. Maybe I shouldn't be swapping at all?

Well, if you're not doing a huge amount of stuff with graphics in firefox or
Gimp, you probably won't need the swap, so I'd turn it off if it's making
things worse.

Here's the specs of a machine that's running as I type this:

2 Dual core Xeons 5140  @ 2.33GHz
8 gigs of ram
2 intel ethernet cards.  It's an IBM x3550 server box.

Currently, I've got 41 people logged in:

sbalneav at sputnik:~$ ps -ef | grep [Mm]etacity | wc
     41     449    4090

sbalneav at sputnik:~$ uptime
 14:05:32 up 12 days, 16:49, 44 users,  load average: 0.38, 0.51, 0.57

 All of them are using NBD.  I'm using Via E10000 mobos with 1 gig of ram

 So, I know the NBD works, at least in my configuration.  Now, I've got "dumb"
 switches: i.e. non-managed regualar D-Link switches.  I wonder if something's
 going on with the networking side of things.  Do you have Managed switches,
 and if so, can you get some stats out of them?


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