[jira] [Commented] (CLOUDSTACK-10377) Nuage VSP regression fails in NetworksWithCleanup test since introduction of fix for CLOUDSTACK-9114 in ACS 4.11&master

["ASF GitHub Bot (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CLOUDSTACK-10377?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16499857#comment-16499857 ] 

ASF GitHub Bot commented on CLOUDSTACK-10377:
---------------------------------------------

rhtyd commented on issue #2672: CLOUDSTACK-10377: Fix Network restart for Nuage
URL: https://github.com/apache/cloudstack/pull/2672#issuecomment-394265766
 
 
   While one comment around refactoring code to a different method is outstanding, @fmaximus can you comment? I'm okay to merge this in order to unblock for RC2. /cc @PaulAngus @DaanHoogland 

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> Nuage VSP regression fails in NetworksWithCleanup test since introduction of fix for CLOUDSTACK-9114 in ACS 4.11&master
> -----------------------------------------------------------------------------------------------------------------------
>
>                 Key: CLOUDSTACK-10377
>                 URL: https://issues.apache.org/jira/browse/CLOUDSTACK-10377
>             Project: CloudStack
>          Issue Type: Bug
>      Security Level: Public(Anyone can view this level - this is the default.) 
>    Affects Versions: 4.12, 4.11.1.0
>         Environment: ACS 4.11 or master with Nuage VSP 5.2.x
>            Reporter: Raf Smeets
>            Assignee: Frank Maximus
>            Priority: Major
>
> 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.



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