show stopper for us: dev nbd0 clients locking up losing connection with server
lists.john at gmail.com
Mon Sep 15 23:04:19 BST 2008
> 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.
Ok, thanks. Is there a place I can go to get a feel for how ltsp
currently works? Is there a doc/web page etc that
sort of says here's how we implement LTSP since 7.10 and here's some
options you can work with e.g
you can edit "/etc/ltsp/nbdswap.conf" etc?
Sorry I am having a hard time getting a handle on the move to NBD etc.
> 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.
Seems like we have pretty similar installations...
> 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?
Sadly most of them are dumb as well. I believe one may be able to do
logging remotely. I'll look into turning that on.
One intersting note:
When I showed a *nix guru I know the log messages :
Sep 12 10:34:44 192.168.0.248 kernel: [679871.912346] end_request: I/O
error, dev nbd0, sector 200140
Sep 12 10:34:44 192.168.0.248 kernel: [679871.912363] end_request: I/O
error, dev nbd0, sector 200142
He pointed out "those sector numbers are just a hair above 50 megs. Have you
looked at the block files which are being served for the clients (I believe
they're in /tmp)? I wonder if the files aren't being sized correctly for
the swap space they need to serve."
Dunno if this rings a bell with you, but I"ll be look into that next.
Thanks for any ideas you may have!
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