Cannot do online backup of 2012 VM within 2012 R2

Hi, I have several Windows 2012 VM's running on a 2012 R2 host. None of these VM's can do an online backup. They both have a SCSI controller installed, and all the HyperV integration services installed. For a 2008 R2 HyperV host, the
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\SystemRestore\ScopedSnapshots registry entry needed to be added.
Does this also need to be added when 2012 R2 is the host?

Hi,
Unfortunately, the available information is not enough have a clear view of the occurred behavior. For narrow down the reason, could you provide more information about your
issue. For example, the exact text of any error messages that you received that are associated with this problem? 
when this problem occurs the system log record information, screenshots is the best information.
You can refer the following similar thread, if your same with that one you can try to fix it first.
Scoped snapshots enabled.
http://social.technet.microsoft.com/Forums/en-US/66c690ba-83c1-4cce-9fda-57a2a39cf7b6/scoped-snapshots-enabled?forum=winservercore
More information:
Event Logs
http://technet.microsoft.com/en-us/library/cc722404.aspx
Thanks.
We
are trying to better understand customer views on social support experience, so your participation in this
interview project would be greatly appreciated if you have time.
Thanks for helping make community forums a great place.

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    Edited by: user12281508 on Jun 1, 2011 10:26 AM
    Edited by: user12281508 on Jun 1, 2011 10:28 AM

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    kind regards
    Martin

    Its a highly technical question and I can be completely wrong due to my very less knowledge but I would attempt to answer still. Hope I say something sensible so bear with me.
    As far as I understand, an online backup of a tablespace can be performed by copying the OS files making up a tablespace while the database is up and being used (i.e. transactions are modifying data in the database).Correct. But it would depend on the tool you are going to use to do so.Using o/s level commands like CP and all would require you to manually copy the files to the backup location. Using RMAN, it would be lot easier and RMAN would take care of everything.
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    During recovery the Oracle RDBMS uses the copies of the OS files together with the online and archived redo logs in order to reconstruct all committed transactions and it further uses the UNDO tablespace to rollback open (uncommitted) transactions.Correct!
    Thinking about this, it seems to me, that in order for this to work in all possible scenarios the undo information from the time the backup was >taken may be required. Therefore backup of the UNDO tablespace should be taken as well (see the explanation for this assumption below). >However browsing the internet (including the Oracle online documentation) I did not find any statements concerning the backup of the UNDO >tablespace when an online backup is taken. Moreover I couldn't figure out when exactly such a backup of the UNDO tablespace must be done, to >ensure that the database can be recovered in all scenarios.The reason that its not a must to do so is that if the transaction is yet active, there is no way that Oracle would overwrite the Undo information of it, even if you may come after 100 years, it would be there. The Undo segment would mark those blocks as active undo blockswhich contains the information of that transaction whose status within the transacton table of that undo segment is still marked as active. So its there all the time in the undo tablespace. Now, for an instance, let's assume that the undo is not there as well( it would be but let's assume), the changes made to the undo segment's blocks are also recored in the redo as its just a change happening to any other segment like EMP,DEPT except with the difference that its not done by you but by oracle. So using that information, in the future , if there would be a need to replay those changes, necessary information to do so can be brought up from the redo blocks stored in the redo/archive logs. Yes, if there would be pending transactions that would require Undo information to get them rolled back and you have lost Undo tablespace and have no backup of it , you wont be able to bring back the database as it would be inconsistent and oracle would not let you to do it. In that case, you may require to use hacks to get it up and that would be really tricky situation.
    (I) Is there any requirement to backup the UNDO tablespace together with an online backup of a tablespace, and if so, where is this stated in the Oracle documentation?As I said above, it must be there if you are anticipating loss of Undo tablespace. If you have lost it, you would need a backup and all the archive logs and redo logs to recover and get it back to the point where the current database is . Rest, oracle would take care as it would reapply the redo contents of the undo segments over the undo segment and get it consitent.
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    HTH
    Aman....

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