CSV Volume low on disk space warning alltough the space isn't used (VSS?)

HI Guys,
we are running a HV-2012 Cluster. most of the VM's are backuped by DPM 2012 r2.
Recently i noticed some "CSV low disk Space Warning" withing SCOM.
Today i looked at one of the CSV's.
The Size is 1800GB and if you look at the Size of all the Folders on the Volume within the Explorer they are 1250 GB.
After that i looked a the Failover Cluster Manager -> Storage -> Disk: This console states that there are only 36GB Free on the Volume.
My guess is that the VSS Snapshots use up the Disk-Space? But if i do a vssadmin list shadowstorage
only drive c is displayed.
Could this end up in a Problem or is the vss Space freed automaticly?
Or is there something else wrong?
Anyone a clue on this?
regards
Stefan

First thing is that you're running out of space and need to move quickly to make space while you figure this out. When you run out of space, the VMs will shut down.
How many VMs you have on that CSV and many VHD(x) disks you have an the CSV? Another question that matters here is how fast is your backup for each VM?
Regardless of the backup software being DPM or any other VSS based backup, it works by creating a checkpoint of the VM, which creates a snapshot of its disks. A volume snapshot turns the VM disk into a read only disk and starts a change log disk (.avhdx)
file. The crash consistent read-only .vhdx file is then copied by the backup software agent from the host to the backup server. Upon successful completion, the agent deletes the VM checkpoint, which merges the disk snapshot, merging the .avhdx and .vhdx files
back into one file.
So, if you're backup time for this VM takes hours, during that time, the VM disk space usage can grow a lot more that what it would usually use. If you run out of disk space then, backup will fail, the VM will be suspended, and you cannot bring it online,
since the merge needs even more disk space.
Sam Boutros, Senior Consultant, Software Logic, KOP, PA http://superwidgets.wordpress.com (Please take a moment to Vote as Helpful and/or Mark as Answer, where applicable) _________________________________________________________________________________
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still bugs me why i am getting this warnings, nothing today but you never know when next one will pop...
Message was edited by: g3m1nn1
Message was edited by: g3m1nn1

I know many have this issue but i can't find a solution to the problem. i get message saying insuffisiant disk space in the volume iPhoto library and i have plenty of space available. i have the new macbook pro with retina display.

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CSV Volume low on disk space warning alltough the space isn't used (VSS?)

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