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From Kelven Yang <>
Subject Re: [DISCUSS] pause VM
Date Mon, 08 Apr 2013 22:16:54 GMT

On 4/8/13 1:39 PM, "Marcus Sorensen" <> wrote:

>Has anyone put together a suggestion for adding a 'paused' state to
>machines? Or is anyone working on it? This seems fairly straightforward,
>and I think we may need the functionality going forward. Even if people
>rarely use it themselves, if storage solutions are going to offer
>they may want to pause the VM in order to get an atomic snapshot if the VM
>has multiple disks. So at least internally it may be a useful utility.

Pause VM itself can not ensure data integrity. True data integrity can't
be ensured without participant of guest OS and related application (for
example, Microsoft offers Volume Shadow Copy Service to orchestrate and
allow applications to participate the process via a set of tools and API
interaction to achieve that).

When CloudStack takes a snapshot of volume, it already utilizes snapshot
feature provided by hypervisor to allow taking point of time storage image
in a safe manner from operating system point of view. The ability of
pausing VM is not mandatory in this case, although pausing/resuming VM may
be useful in certain use case, it does not seem to be in any urgency or
fit naturally in general cloud-operations.


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