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From "ASF subversion and git services (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CLOUDSTACK-3443) Timeoffset on Windows guests not persisted between VM stop/start from Cloudstack
Date Wed, 10 Jul 2013 12:23:48 GMT

    [ https://issues.apache.org/jira/browse/CLOUDSTACK-3443?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13704494#comment-13704494
] 

ASF subversion and git services commented on CLOUDSTACK-3443:
-------------------------------------------------------------

Commit 033d05fa2076b5cf72f3942b4e8a9a1ff685842f in branch refs/heads/master from [~devdeep]
[ https://git-wip-us.apache.org/repos/asf?p=cloudstack.git;h=033d05f ]

CLOUDSTACK-3443: Timeoffset on windows guest not persisted between VM stop and start on XenServer.
The problem was because in cloudstack when a vm is stopped it gets destroyed on the host.
For a
windows vm the timeoffset (which can be set by changing the timezone from within the vm) is
stored
in the platform:timeoffset attribute of vm record. The information is lost when the vm is
destroted.
Made change to read and persist the platform:timeoffset vm attribute when an instance is stopped.
The value is persisted in the user_vm_details table. When the vm is started again the attribute
is
set for the vm instance that gets created.

                
> Timeoffset on Windows guests not persisted between VM stop/start from Cloudstack
> --------------------------------------------------------------------------------
>
>                 Key: CLOUDSTACK-3443
>                 URL: https://issues.apache.org/jira/browse/CLOUDSTACK-3443
>             Project: CloudStack
>          Issue Type: Bug
>      Security Level: Public(Anyone can view this level - this is the default.) 
>    Affects Versions: 4.1.0
>            Reporter: Devdeep Singh
>            Assignee: Devdeep Singh
>            Priority: Critical
>             Fix For: 4.2.0
>
>
> For Windows guests, time is initially driven from the control domain clock. However,
XenServer also stores for each Windows VM a time offset. This represents the difference between
the control domain time and the guest, and is persisted for each VM. if you manually set a
VM to be 2 hours ahead of the control domain (e.g. via a time-zone offset within the guest),
then it will remember that.
> This information is stored by Xenserver in the parameter "platform" in a key/value pair
where the key is "timeoffset". You can check this using "xe vm-param-list uuid=<vmuuid>".
> This information is persisted with Xenserver until the VM exists. The problem is that
Cloudstack stop VM operation is really a destroy on Xenserver. When you start the VM again
a new VM is launched (of course using the same disk). In this process the above information
is lost as Cloudstack doesn't store it and pass it on to the hypervisor when launching the
VM.

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