Linux on Hyper-V – a summary 10.2014

I struggled with a Live Backup issue on Ubuntu 2014 LTS a while ago as ralish from Stockholm DevOps describes here.
The problem was a broken installer meta package and ends up in a missing kvp deamon if you tried to install it on Ubuntu.
This daemon is used to interact between Host and VM to get a consistent backup state during snapshot creation on the Hyper-V Host.
So at the end, Backups without kvp can be risky due to a service interruption of the VM workload(s).

A screenshot from the DPM 2012 R2 Backup console shows the offline state.

In the meantime, the bug got fixed, Live Backups without service interruption can be taken, the sun is shining again and so it’s time to wrap some things up and give you a short overview about Hyper-V and common Linux Distributions.

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Increasing Deduplication Performance on Server 2012/R2 … a bit

Updated 02.02..2015

It’s been a while since the dedup feature came to us with Server 2012.
Actually 2 years ago I started playing around and since then it’s one of my favourite features.
For testing purposes I have had deduped nearly everything I could and still use it in “unsupported” scenarios like non VDI environments.
I got quite an overview how rock solid this feature really is.

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owned by a different DPM server

The full error message is:

“DPM could not run the backup/recovery job for the data source because it is owned by a different DPM server.
Data source: \Online\DC-01 Owner DPM Server: DPM-02.contoso.com. (ID 3184 Details: Internal error code: 0x809909B3)”
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Starting up a scheduled Replication Job in DPM 2012/R2 … immediately

Sometimes i’m creating scheduled replication tasks because i’m still working on servers and systems or i have performance considerations.
Surprisingly often I’m finished earlier than expected and would like to start the postponed tasks as soon as possible.


But i couldn’t find DPM specific tasks within the task scheduler and starting the job with the usual way via GUI wasn’t helpful. Continue reading