Details
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Bug
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Status: Closed
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Major
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Resolution: Fixed
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4.12, 4.11.1.0
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None
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None
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Security Level: Public (Anyone can view this level - this is the default.)
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None
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ACS 4.11 or master with Nuage VSP 5.2.x
Description
Nuage VSP regression fails in NetworksWithCleanup test since introduction of fix for CLOUDSTACK-9114 in ACS 4.11&master
In Nuage Networks QA regression cycle, cloudstackExpress is failing for master & 4.11 in expressrestartNetworksWithCleanup test.
The error is Unable to create a deployment.
Issue is caused by fixing https://issues.apache.org/jira/browse/CLOUDSTACK-9114
Reason is that for non-redundant routers, a strategy was implemented where first a new VR is deployed, then old VR is powered-off/destroyed, and the new VR is again re-programmed. With this strategy, two identical VRs may be up for a brief moment (few seconds) where both can serve traffic, however the new VR performs arp-ping on its interfaces to update neighbours. After the old VR is removed, the new VR is re-programmed which among many things performs another arpping. The theoretical downtime is therefore limited by the arp-cache refresh which can be up to 30 seconds. In my experiments, against various VMware, KVM and XenServer versions I found that the downtime was indeed less than 30s, usually between 5-20 seconds. Compared to older ACS versions, especially in cases where VRs deployment require full volume copy (like in VMware) a 10x-12x improvement was seen.BUT NUAGE PLUGIN FAILS AS IP ADDRESS IS ALREADY IN USE.