Re: Stability of XEN under high load Re: Stability of XEN under high load Re: [xen-users] Stability of XEN under high load

["Dirk H. Schulz" <dirk.schulz@xxxxxxxxxxxxx>]

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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