Re: [Xen-API] OVS, CloudStack, and Crashing XenServer

[Mike McClurg <mike.mcclurg@xxxxxxxxxx>]

On 06/07/12 17:13, Clayton Weise wrote:
> I have recently encountered a reproducible and rather catastrophic issue with OVS and 
> XenServer caused by CloudStack.  For CloudStack, during the "snapshot" process 
> with CloudStack a snapshot is created on the XS host, then it's copied off to an NFS 
> share as a .vhd file via a specialized VM called the secondary storage VM (SSVM).
>
> If the SSVM and guest VM that is being snapshotted are on the same host about 
> 4-5 GB into the copy process ovs-vswitchd consumes all available CPU on the 
> host to the point that it becomes unusable and all management interfaces 
> (including our 10gbit iSCSI NICs) become unresponsive.  I've waited over 30 
> minutes for this problem to correct itself but it never seems to.  After 
> switching from OVS to bridged networking mode I have been able to successfully 
> copy 100GB snapshots without issue.
>
> Any insight into this would be appreciated.  I would be happy to reproduce this 
> problem and provide any logs available.
Hi Clayton, thanks for reporting this issue. Yes, logs will help. I'll 
let Dominic (CC'd) tell you which logs he'd like to see.
Mike

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