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From Sateesh Chodapuneedi <sateesh.chodapune...@citrix.com>
Subject RE: [DISCUSS] Out of Band VR migration, should we reboot VR or not?
Date Wed, 03 Jun 2015 13:17:06 GMT
> -----Original Message-----
> From: Koushik Das [mailto:koushik.das@citrix.com]
> Sent: Wednesday, June 3, 2015 6:08 PM
> To: dev@cloudstack.apache.org
> Subject: RE: [DISCUSS] Out of Band VR migration, should we reboot VR or not?
> 
> I think as a design principle we shouldn't introduce HV specific checks in the
> orchestration/API layers.
> I am not sure if the problem is specific to Vmware. Any out of band VR
> movement can lead to this issue. For now it is seen in Vmware but what about
> other HVs where CS relies on native HA provided by HV.

[Sateesh] Same is applicable to Hyper-v if HA is enabled
Also in case of VMware, even enabling DRS causes out of band movement of VMs from host to
host.
I think it'd be better to address this irrespective of underlying hypervisor.

Regards,
Sateesh
> 
> -----Original Message-----
> From: Remi Bergsma [mailto:RBergsma@schubergphilis.com]
> Sent: Wednesday, 3 June 2015 17:54
> To: dev@cloudstack.apache.org
> Subject: Re: [DISCUSS] Out of Band VR migration, should we reboot VR or not?
> 
> This is a VMware specific problem, right?
> We could also limit the fix to this hypervisor only.
> 
> Regards,
> Remi
> 
> 
> On 03 Jun 2015, at 14:12, Koushik Das
> <koushik.das@citrix.com<mailto:koushik.das@citrix.com>> wrote:
> 
> In case the VR is moved out of band (say as part of Vmware DRS), all network
> rules are lost. Rebooting VR from CS re-applies all the rules. Either the reboot is
> done manually from UI/API or automatically as was done as part of
> CLOUDSTACK-7994.
> 
> I haven't looked at the aggregate command. If it can be used to apply rules on
> VR without a reboot then that should work as well.
> 
> -Koushik
> 
> -----Original Message-----
> From: Rohit Yadav [mailto:rohit.yadav@shapeblue.com]
> Sent: Wednesday, 3 June 2015 17:18
> To: dev
> Subject: [DISCUSS] Out of Band VR migration, should we reboot VR or not?
> 
> Hi all,
> 
> Recently a behaviour was reported for ACS 4.5.1, where out of band VR
> migration would cause rebooting of VR. It seems this is a desired behaviour as
> per this issue: https://issues.apache.org/jira/browse/CLOUDSTACK-7994
> 
> It was shared on the thread on users ML that since CloudStack now supports
> aggregate commands for VR, this behaviour is unnecessary.
> 
> The VR in 4.5+ supports aggregated execution of commands on VRs to allows us
> to achieve eventual consistency of VR state without actually rebooting it, see
> this for details: https://issues.apache.org/jira/browse/CLOUDSTACK-6047
> 
> Please share your comments on whether if we should revert the fix or not, and
> the best way to do it. Thanks.
> 
> Regards,
> Rohit Yadav
> Software Architect, ShapeBlue
> M. +91 88 262 30892 |
> rohit.yadav@shapeblue.com<mailto:rohit.yadav@shapeblue.com>
> Blog: bhaisaab.org<http://bhaisaab.org> | Twitter: @_bhaisaab
> 
> 
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