[lvs-users] LVS-DR and scp
scooter at cgl.ucsf.edu
Wed Dec 2 17:29:16 GMT 2009
Thanks for the quick reply! In answer to your question, the stall
occurs in about 30 seconds, and the overall throughput is significantly
slower to begin with. For example, from my workstation to a node in the
cluster, I get a throughput of around 9MB/s. Going through the
redirectors, it starts off at 1.2 MB/s and then stalls very quickly
after that. I actually added the "persistent = 600" in an attempt to
see if that would help the situation, but it didn't. Last night I also
disabled IPV6 on all nodes to see if that had an impact, but no joy
there either. I'm happy to run tcpdump if it can provide any clues.
On 12/02/2009 01:26 AM, Graeme Fowler wrote:
> On Tue, 2009-12-01 at 15:02 -0800, Scooter Morris wrote:
>> I have a two-node LVS configuration that I'm using as a front-end
>> to a three-node cluster. It works really well for ssh, http, https,
>> etc. But, when a user tries to use scp to copy a large file or
>> directory to the cluster, it commonly stalls and doesn't complete.
>> scp directly to any node of the cluster works fine, either from outside
>> the network or from inside it.
>> Things only crawl when using scp to go through the redirectors. Here
>> are the relevant parts of the configuration file:
> That all looks sane enough.
> Question: how long does it take before a stall occurs? If it's around
> about 10 minutes... you should be able to see what I'm getting at there.
> We might need you to do some tests while running tcpdump, to see where
> the stall occurs.
> Please read the documentation before posting - it's available at:
> LinuxVirtualServer.org mailing list - lvs-users at LinuxVirtualServer.org
> Send requests to lvs-users-request at LinuxVirtualServer.org
> or go to http://lists.graemef.net/mailman/listinfo/lvs-users
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