[Linux-cluster] GFS freezing

[Michael Conrad Tadpol Tilstra]

On Tue, Jul 05, 2005 at 02:32:00PM -0400, Scott.Money at lycos-inc.com wrote:
>    We are seeing a similar issue. We have a 3 node gfs system that
>    uses a gnbd server as storage. We originally ran into this problem
>    quite frequently, but hard-setting our NICs to 100Mbit  full duplex
>    has limited the system freezes to "large" data transfers. (e.g.
>    copying 500mb files via scp or creating 500mb Oracle tablespaces).
>    The good news is that the fencing works ;-)
>    Let me know if you get any information about this.

What you describe here sounds more like flooding of the network.  If you
send too much data over the same network device as the heartbeat&locking
traffic, you can starve out the heatbeats.  There was a bunch of emails
about this already on this list.  The way to deal with it is one of
1: don't ever flood the network, 2: use a provate network for heartbeats
& lock traffic, 3: use the traffic shaping kernel modules to provide a
garunteed bandwidth for the heartbeat & locking traffic.

-- 
Michael Conrad Tadpol Tilstra
What is your one purpose in life?
To explode of course!
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: application/pgp-signature
Size: 189 bytes
Desc: not available
URL: <http://listman.redhat.com/archives/linux-cluster/attachments/20050705/92becb81/attachment.sig>