Used and allocated Shadow Copy Storage space is showing values in GB .

Hi All ,
This is an production issue and i need an urgent help on this case.
In my environment i am having exchange server 2013 in DAG extended with three sites.On that i am having two mailbox servers in the production site and one mailbox server in remaining two sites.
we have mounted all the mailbox databases in one production mailbox server.Those databases are present in LUN mapped to the production mailbox servers from SAN storage.
Issue :
Few of the mailbox databases are occupying too much of size on the LUN than it's original size.
Say for instance i have kept the mailbox database called "test" which is present on the LUN with the size of 190 GB.On that whole space the mailbox database is occupying only 100GB but on the diskmgmt and also on the explorer it is showing
only the free space as 17 GB.
Finally we have run the below mentioned command and found that the used and allocated shadow storage is occupying the size around 34 GB.
Attached snap for your reference :
Question : How to reclaim the space occupied by the shadow copy storage to the LUN ? If possible someone tell me why this issue is happening ?
Thanks & Regards S.Nithyanandham

Hi,
According to my research and technology, it’s caused by Volume Shadow Copy Service which is used to backup infrastructure for the Microsoft operation systems, as well as a mechanism for creating consistent point-in-time copies of data known as shadow copies.
We can use VssAdmin to create, delete, and list information about shadow copies. More details about Volume Shadow Copy Service, for your reference:
https://technet.microsoft.com/en-us/library/ee923636(v=ws.10).aspx
Besides, this issue may be related to Windows server. I recommend you to contact to Windows Server Team so that you can get more professional suggestions, please refer to:
https://social.technet.microsoft.com/Forums/windowsserver/en-US/home?category=windowsserver
Thanks
Please remember to mark the replies as answers if they help, and unmark the answers if they provide no help. If you have feedback for TechNet Support, contact [email protected]
Allen Wang
TechNet Community Support

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[2008R2] Prevent event : The shadow copies of volume D: were deleted because the shadow copy storage could not grow in time

During the restore of data using VSS Snapshots it deleted all the snapshots, this event was written in the system log :
The shadow copies of volume D: were deleted because the shadow copy storage could not grow in time. Consider reducing the IO load on the system or choose a shadow copy storage volume that is not being shadow copied.
It only restored 20 GB of data and there should be plenty of space in the Shadow copy storage
Used Shadow Copy Storage space: 2.692 GB (0%)
Allocated Shadow Copy Storage space: 5.397 GB (0%)
Maximum Shadow Copy Storage space: 694.752 GB (18%)
When there isn't enough space it should start to delete the oldest snapshots to free up additional space, but it deleted
all the snapshots. The problem is the IO but how to prevent this from happening again?

Hi,
Since the shadow copy storage space doesn’t run out, the issue could be due to the Volsnap.sys driver has encountered excessive I/O activity.
You could refet to the article below to resolve the issue. This article is for Windows 2003 but it will also help on Windows 2008 R2 system.
Error message when a Windows Server 2003-based computer has a high level of I/O activity: "The shadow copies of volume Volume_Name were aborted because the diff area file could not grow in time"
http://support.microsoft.com/kb/925799
Best Regards,
Mandy
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Wbadmin Insufficient storage available to create either the shadow copy storage file or other shadow copy data

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I want to be able to get the operating system's state volumes and not use -include:c: in a fixed way for cases when os is not on drive C.
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Hi Yanivac,
For the issue, the target volume for a critical-volume backup can be a local drive, but it cannot be any of the volumes that are included in the backup. This is important.
Also, this error means that there is no enough space on the target volume.
I suggest you check the space on your target volume.
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http://technet.microsoft.com/en-us/library/cc742130.aspx
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The shadow copy of volume E: were aborted because the shadow copy storage failed to grow

Hello there,
I am facing an issue regarding DPM 2010 backup.
Every time my tape backup is being failed and the error is "The shadow copy of volume E: were aborted because the shadow copy storage failed to grow" .
My protected server is an win 2008R2 File server which is getting backed up from DPM 2010 server.
The total space of E: is 700 GB out of which 750 MB space is free.
So i am quite confused how much space should be free in protected server drive for successful backup.
It would be great if someone could help me regarding this matter.
Thanks in advance.
Regards, Ishuv

Hello,
Though it is written that minimum space required is 300 MB but i still do have 700 MB free out of 759 GB in my protected server drive (E:).
The error detail is ;
Source: Volsnap
Event ID: 35
Error General: "The Shadow copies of volume E: were aborted because the shadow copy storage failed to grow."
The backup server is DPM 2010 attached with IBM tape library which have LTO 5 cartridge.
Protected server is Win2k8R2 file server. 'E:' drive total space is 759 GB in which 700 MB is free.
So , as per my understanding from the error above is VSS is unable to grow because of limited free space in the specific E drive. In Drive (E:) there is only 700 MB space free. Now my question is how much free space should be there in the protected server
drive to complete the backup successfully by the DPM 2010 server which is storing the backups in IBM LTO5 tape library.
Is there someone who had faced this issue. Please help!!
Regards,
Ishuv
Regards, Ishuv

"DPM uses the Volume Shadow Copy Service (VSS)"

"DPM uses the Volume Shadow Copy Service (VSS) to create a snapshot of the protected data."
According to MS (http://technet.microsoft.com/en-us/library/bb808827.aspx)
Does that mean I have to set asides space on the protected server (a file server), so it can store shadow copies, and the DPM server taps into those shadow copies to create its recovery points etc?
Thanks

Hi Joe,
when you are protecting a file server. DPM will implement a change journal to record all the blocks that have been changed.
Then once the sync starts. The journal is interrogated and will tell DPM which file have been changed.
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Does deduplication and Volume Shadow Copy work together?

Hi!
I have a fileserver with five 2TB-disks on it on a 2012 R2 server. I want to enable dedup on it that according to DDPEval.exe would save ~40%. I would also like to enable Volume Shadow Copies on the volumes so the the end user easily could restore removed
files and folders.
I have not found anything from microsoft about use both these features on the same volume, is it supported?
I have done some searching and found that for some users the say that dedup would change so much on the snapshots that it have to delete older snapshots, even though not much data have changed, the dedup force VSC to delete old snapshots.
Any experience with these features co-located on the same volume? Do I need to choose just one of them to use on my volumes?
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Hi,
Based on my research, the Shadow Copy and Deduplication could be used together in a Windows Server 2012 R2. The deletion of the old snapshots could be due to the Volume for which the shadow copy being created is more than 64 TB. Volume Shadow Copy Service supports
a volume size of up to 64 TB.
For more detailed information, you could refer to the article below:
Windows 2012 R2 Data Deduplication Leverages Shadow Copies: “LastOptimizationResultMessage : A volume shadow copy could not be created or was unexpectedly deleted”.
https://workinghardinit.wordpress.com/2014/07/01/windows-2012-r2-data-deduplication-leverages-shadow-copies-lastoptimizationresultmessage-a-volume-shadow-copy-could-not-be-created-or-was-unexpectedly-deleted/
Please Note: Microsoft is providing this information as a convenience to you. The sites are not controlled by Microsoft. Microsoft cannot make any representations regarding the quality, safety, or suitability of any software or information found there. Please
make sure that you completely understand the risk before retrieving any suggestions from the above link.
Best Regards,
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Please remember to mark the replies as answers if they help and unmark them if they provide no help. If you have feedback for TechNet Subscriber Support, contact [email protected]

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No space used by DPM shadow copy volume

Hi,
Please help me to understand more DPM shadow copies.
Actually when exactly the shadow copies are getting created? Whether it is during synchronization backup or express full back up or both?
Please see the below snap. It is disk utilization report of one week for exchange backup. I have configured protection group as every 30 min synchronization backup & every day express full backup for 2 days of retention range.
So here I want to understand that why there is no any space used for shadow copies though my both backups (synchronization & express full) are running successful.

Hi,
If you are using DPM 2012 R2, this is a known issue that will be fixed in the next update. As an alternate, run "vssadmin list shadowstorage" from administrative command prompt.
Please remember to click “Mark as Answer” on the post that helps you, and to click “Unmark as Answer” if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread. Regards, Mike J. [MSFT]
This posting is provided "AS IS" with no warranties, and confers no rights.

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db999:/var/opt/perf/datafiles# bdf
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/dev/vg00/lvol1 1835008 302552 1520560 17% /stand
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/dev/vg00/lvol8 4096000 2233680 1847800 55% /home
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Used and allocated Shadow Copy Storage space is showing values in GB .

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