Stefan and All, Happy New Year!
Stefan, the issue is not due to NFS. I tried to use local disk for vm image template (when new VM is provisioned, it is copied from a local directory). It seems all big disk I/O at the hosts will trigger VM's network timeout. However, ping or ssh the timeout VM shows not big lag.... If I raise the timeout, it will make the whole heartbeat thing no use. I need to run a high frequency heartbeat, while keeping it from any timeout triggered by disk I/O BR, DuDu On Sat, Dec 25, 2010 at 5:30 PM, Stefan P <deubeul...@gmail.com> wrote: > On Saturday, December 25, 2010, DuDu <black...@gmail.com> wrote: > > Hi,t > > > > I knew my issue sounds weird, and I'm not sure it is opennebula's fault. > But the problem is really annoying, so can anyone shed some light? > > I've a opennebula cluster deployed and running, with local disk. When a > new VM gets provisioned, the disk template is copied from a NFS to the > host's local disk. I've two VMs running on two hosts. These VMs have some > heartbeat connection between them, for HA. However when a third VM is > provision on one host (during the disk image copy process), the heartbeat > connection is timeout (socket returns "Broken Pipe"). So the failover is > triggered....(obviously it is NOT correct). > > > > CPU usage during the copying, and it was around 17%, which is not high. > Ping the host didn't show significant lag. I don't really understand why the > host's disk I/O triggers the VM's network problem, do you? > > > > It sounds plausible anyway - with nfs you involve the network too, and > copying big files can bring hell in scheduling latencies... > > What hypervisor do you use ? If you ping the vms themselves during > provisionning, do you see latency ? What about ssh interactiveness on > the host and vms ? > > In parallel, I'd start by raising heartbeat's timeout to big values > (ie timeout > time to copy a vm), just to confirm what's happening. > > > > BR > > > > > > > > -- > *Stefan Praszalowicz* > * > * >
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