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From Remi Bergsma <RBerg...@schubergphilis.com>
Subject Re: [DISCUSS] Out of Band VR migration, should we reboot VR or not?
Date Wed, 03 Jun 2015 12:25:09 GMT
That’s great, sounds like the best way to do it then :-)

> On 03 Jun 2015, at 14:21, Sudhansu Sahu <Sudhansu.Sahu@citrix.com> wrote:
> 
> The aggregate command was introduced in 4.4 so we can implement this in
> 4.4 as well.
> 
> 
> Regards
> Sudhansu Sahu
> CPG-Orchestration
> T: +91-4044308412 | M: +91-9989334676
> Sudhansu.Sahu@citrix.com <mailto:%20Sudhansu.Sahu@citrix.com>
> 
> <http://www.citrix.com>
> 
> Powering mobile workstyles and cloud services
> 
> 
> 
> 
> 
> 
> On 03/06/15 5:35 pm, "Remi Bergsma" <RBergsma@schubergphilis.com> wrote:
> 
>> Hi all,
>> 
>> If I understand correctly, this is also in 4.4.3 (and the upcoming
>> 4.4.4). The report on user list:
>> http://markmail.org/message/nth7qck27s2chwoc?q=VMsync+issues+with+VRs%3F<h
>> ttp://markmail.org/message/nth7qck27s2chwoc?q=VMsync+issues+with+VRs?>
>> 
>> As VPCs are non-redundant, a sudden reboot impacts users. I¹d like to do
>> this in a non-impacting way.
>> 
>> Why out-of-band migrations? When patching XenServer at scale, it is much
>> faster to set the cluster to ³unmanaged² in CloudStack and ³evacuate² a
>> XenServer host directly (i.e. making it empty by live-migrating), turn
>> off HA, disable it, patch, reboot, enable, and do this for all
>> hypervisors in the pool. Finally, turning HA on again and set CloudStack
>> to ³manage² the cluster again. I have scripted this, so we can
>> automatically patch clusters at scale.
>> 
>> In CloudStack 4.4.2 this works and the database gets updated with the
>> current information on where VMs live. In CloudStack versions which
>> include this fix, CloudStack will reboot all routers ³to be sure². This
>> prevents me from doing maintenance without impact.
>> 
>> I¹d propose to either limit the fix to VMware, or come up with a way that
>> does not require a reboot.
>> CLOUDSTACK-6047 sounds interesting, just curious how to do it in 4.4 for
>> now.
>> 
>> Regards,
>> Remi
>> 
>> 
>> On 03 Jun 2015, at 13:48, Rohit Yadav
>> <rohit.yadav@shapeblue.com<mailto:rohit.yadav@shapeblue.com>> wrote:
>> 
>> 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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