On Fri, Jun 9, 2017 at 3:39 PM, Matthias Leopold < matthias.leop...@meduniwien.ac.at> wrote:
> hi, > > i'm having trouble creating VM snapshots that include memory in my oVirt > 4.1 test environment. when i do this the VM gets paused and shortly > (20-30s) afterwards i'm seeing messages in engine.log about both iSCSI > storage domains (master storage domain and data storage where VM resides) > experiencing high latency. this quickly worsens from the engines view: VM > is unresponsive, Host is unresponsive, engine wants to fence the host > (impossible because it's the only host in the test cluster). in the end > there is an EngineException > > EngineException: org.ovirt.engine.core.vdsbroke > r.vdsbroker.VDSNetworkException: VDSGenericException: > VDSNetworkException: Message timeout which can be caused by communication > issues (Failed with error VDS_NETWORK_ERROR and code 5022) > > the snapshot fails and is left in an inconsistent state. the situation has > to be resolved manually with unlock_entity.sh and maybe lvm commands. this > happened twice in exactly the same manner. VM snapshots without memory for > this VM are not a problem. > > VM guest OS is CentOS7 installed from one of the ovirt-image-repository > images. it has the oVirt guest agent running. > > what could be wrong? > > this is a test environment where lots of parameters aren't optimal but i > never had problems like this before, nothing concerning network latency. > iSCSI is on a FreeNAS box. CPU, RAM, ethernet (10GBit for storage) on all > hosts involved (engine hosted externally, oVirt Node, storage) should be OK > by far. > Are you sure iSCSI traffic is going over the 10gb interfaces? If it doesn't, it might choke the mgmt interface. Regardless, how is the performance of the storage? I don't expect it to require too much, but saving the memory might require some storage performance. Perhaps there's a bottleneck there? Y. > > it looks like some obvious configuration botch or performance bottleneck > to me. can it be linked to the network roles (management and migration > network are on a 1 GBit link)? > > i'm still new to this, not a lot of KVM experience, too. maybe someone > recognizes the culprit... > > thx > matthias > _______________________________________________ > Users mailing list > Users@ovirt.org > http://lists.ovirt.org/mailman/listinfo/users >
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