<div dir="ltr"><br><div class="gmail_extra"><br><div class="gmail_quote">On Fri, Jun 9, 2017 at 3:39 PM, Matthias Leopold <span dir="ltr"><<a href="mailto:matthias.leopold@meduniwien.ac.at" target="_blank">matthias.leopold@meduniwien.ac.at</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">hi,<br>
<br>
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<br>
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EngineException: org.ovirt.engine.core.vdsbroke<wbr>r.vdsbroker.VDSNetworkExceptio<wbr>n: VDSGenericException: VDSNetworkException: Message timeout which can be caused by communication issues (Failed with error VDS_NETWORK_ERROR and code 5022)<br>
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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.<br>
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VM guest OS is CentOS7 installed from one of the ovirt-image-repository images. it has the oVirt guest agent running.<br>
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what could be wrong?<br>
<br>
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.<br></blockquote><div><br></div><div>Are you sure iSCSI traffic is going over the 10gb interfaces?</div><div>If it doesn't, it might choke the mgmt interface.</div><div>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?</div><div>Y.</div><div> </div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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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)?<br>
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i'm still new to this, not a lot of KVM experience, too. maybe someone recognizes the culprit...<br>
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thx<br>
matthias<br>
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