Hyper-V VM Issue

Posted on 2012-09-04
Last Modified: 2015-04-03
HI Experts,

I have an issue with a VM in Hyper-V

I created a disk too small for an SBS2011 which I partitioned into two. (C and D drives)120GB in total.

My problem is I created a snapshot some weeks back went to do a increase disk size (had never done this before) didnt read the instructions closely, created an increased size disk and could'nt boot.

Got out of trouble with that part of it through vhdtool but my problem now is that I can't seem to merge the avhd to the parent disk  -

followed these instructions it seem to work fine until I rebooted and came up with an OS error.

Used the correct dated avhd but it is smaller which didnt make sense...

BUt I seem to have two avhd's which is confusing me as I only created one snapshot

the size of the parent vhd is 114GB

the size of the 1st avhd is 34GB (this one had the current date and time)
the size of the 1st avhd is 48GB (this one was a few weeks ago)

really confused as the size of the whole disk is 120GB... how on earth does that work out to be? that would really love it for someone to shed some light on this thankyou.
Question by:it_fan
    LVL 116

    Accepted Solution

    try shutting down the VM, and see if it asks to Merge?

    snapshots are usually chained with to the parents, and only one will be written to.

    To understand Hyper-V Snapshots further consult this article

    Hyper-V Snapshots FAQ

    Author Comment

    Have tried a few times but never asked that will have a close look at your link in the morning thanks for that...

    Author Comment

    thanks hanccocka,

    I had a chance to review the document but that doesnt get me sorted though, really stuck on this one...

    This morning  I reliased what had happened last night is that after I renamed the latest .avhd it merged with the other .avhd (which I really dont know why it is there) going to play around with a backup I made of that folder on another server.

    I tried merging it with the parent .vhd that worked but would not boot....  I shall plod along
    LVL 5

    Assisted Solution

    by:Manojkumar Rane
    Use inspect disk option on both the snapshot files (.avhd) and try to find out the parent disk.
    This will help you to find the exact snapshot file that will merge into parent disk.

    Featured Post

    What Should I Do With This Threat Intelligence?

    Are you wondering if you actually need threat intelligence? The answer is yes. We explain the basics for creating useful threat intelligence.

    Join & Write a Comment

    Lets start to have a small explanation what is VAAI(vStorage API for Array Integration ) and what are the benefits using it. VAAI is an API framework in VMware that enable some Storage tasks. It first presented in ESXi 4.1, but only after 5.x sup…
    This is similar to the error described in my previous Article, but with a different source problem and a different solution. When trying to scan and stage the ESXi 6.0 updates using VMware Update Manager, we can get "error code 90"
    This tutorial will give a short introduction and overview of Backup Exec 2012 and how to navigate and perform basic functions. Click on the Backup Exec button in the upper left corner. From here, are global settings for the application such as conne…
    In this video tutorial I show you the main steps to install and configure  a VMware ESXi6.0 server. The video has my comments as text on the screen and you can pause anytime when needed. Hope this will be helpful. Verify that your hardware and BIO…

    728 members asked questions and received personalized solutions in the past 7 days.

    Join the community of 500,000 technology professionals and ask your questions.

    Join & Ask a Question

    Need Help in Real-Time?

    Connect with top rated Experts

    16 Experts available now in Live!

    Get 1:1 Help Now