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Re: Stability of XEN under high load Re: Stability of XEN under high loa

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Subject: Re: Stability of XEN under high load Re: Stability of XEN under high load Re: [xen-users] Stability of XEN under high load
From: "Dirk H. Schulz" <dirk.schulz@xxxxxxxxxxxxx>
Date: Mon, 01 Dec 2008 12:02:45 +0100
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We do not have a problem of losing the bridges - they are still there, and brctl shows the interfaces of the disconnected domUs still on the bridge. There is just no connection to the outside world any more.

E.G.: sending pings between 2 domU (one of which is in the problematic disconnected state) and running tcpdump on both domUs shows: - a ping from the disconnected domU to the other does not reach the interface of the dead domU internally: tcpdump does not register anything! - a ping from the other domU to the disconnected one does not reach the interface of the disconnected domU.

So this could be a problem with the domU kernel. But since this is a hvm domU it is a standard kernel - I guess it must the network backend drivers, then.

The dom0 and domUs are ia64 (Itanium)-Systems, which could mean that we hit an ia64 specific bug.

Any idea? Every hint and help is greatly appreciated.

Dirk (working with Bernd, see below)

I saw a problem of losing network bridges before that was related to
problems with spanning tree. You may be experiencing a similar problem

Rob Aronson
Practice Manager, Novacoast
USA


On Sun, Nov 30, 2008 at 12:13 AM, Bernd Gotschy <Bernd.Gotschy@...> wrote:

    Hallo,

    we have a XEN server with Redhat 5.2 and XEN 3.0.3. We have two
    problems.
    We build an Oracle RAC with two XEN guest Redhat 4.4. When we add more
    then 3 GB of RAM we cannot work with shared disks between the guests.
    Looks like a XEN bug. We have to reduce the RAM to max. 3 GB.
    Major problem is  that under high load we loose some of the network
    interfaces and cannot get them working unless we reboot the guest.
    We need RH 4.4 as guest operating system. The guests are HVM.
    We have two bridges defined for the networker communication. It
    seem one bridge is no longer functional. We have a XEN IA64 server.

    Any idea how to solve this problem?

    regards
    Bernd

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