EXCHANGE 2010 DAG

I am getting below error on my DAG database back up failures:

 we can see that the CommVault operation is failing because it is unable to locate the shadow for the DB during backup.

  exTiDbBackup.log
  =============
  948 1d10 02/06 03:16:07 1453502 [CsExchangeShadow::FullBackup] failed to backup file [\\?\GLOBALROOT\Device\HarddiskVolumeShadowCopy944\DB\IME.Db.edb
  948 1d10 02/06 03:16:07 1453502 Abort shadow operation
  948 1d10 02/06 03:16:07 1453502 Entering [CVSSClientShadow::AbortShadow]
  948 1d10 02/06 03:16:07 1453502 CsSnapRequestor::DeleteSnapshot() - Call m_vss-DeleteSnapshots(m_snapshotSetId, type, bForceDelete, &lDeletedSnapshots, &NondeletedSnapshotID) [FAILED, throwing CV exception] - Code = 0x80042308, Description = VSS_E_OBJECT_NOT_FOUND
  948 1d10 02/06 03:16:07 1453502 CsSnapRequestor::DeleteSnapshot() - Error deleting a8132c1e-3d54-43a0-a9ec-2fd3f834143d shadow set - VSS_E_OBJECT_NOT_FOUND
  948 1d10 02/06 03:16:07 1453502 CsSnapRequestor::BackupComplete() - Call DeleteSnapshot() [FAILED, throwing CV exception] - Code = 0x80042308, Description = VSS_E_OBJECT_NOT_FOUND
  948 1d10 02/06 03:16:07 1453502 CsSnapRequestor::BackupComplete() - Failed to delete the snapshot set VSS_E_OBJECT_NOT_FOUND


  948 1d10 02/06 03:16:07 1453502 [::Backup]: Failed to perform VSS backup. Backup .
  =============
pramod1Asked:
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Eric WoodfordConnect With a Mentor Software Systems Specialist 3Commented:
I would definitely follow up on that. Could you have multiple backup solutions attempting to backup your servers at the same time?  

Searching that error code, I find
https://library.netapp.com/ecmdocs/ECMP1201910/html/GUID-BDF8955F-DE07-49EC-9411-E6BA9D27CF74.html

Which appears to relate to NetApp solution..
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Mark BillExchange, AD, SQL, VMware, HPE, 3PAR, FUD, Anti MS Tekhnet, Pro EE, #1Commented:
Are any of the VSS writers in an error state?
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pramod1Author Commented:
no
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Mark BillConnect With a Mentor Exchange, AD, SQL, VMware, HPE, 3PAR, FUD, Anti MS Tekhnet, Pro EE, #1Commented:
just seen this https://www.experts-exchange.com/questions/29082531/EXCHANGE-2010-DAG.html your question?
just after reading this is a follow on question i guess as you mention a vol limit before.

Is the account being used a member of organization management for exchange in active directory?
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pramod1Author Commented:
yes
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Mark BillExchange, AD, SQL, VMware, HPE, 3PAR, FUD, Anti MS Tekhnet, Pro EE, #1Commented:
If you filter the application and system log for criticals, warnings and errors only can you see anything relevant? especially in and around the time of the job/errors.

How many servers in DAG?
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Mark BillExchange, AD, SQL, VMware, HPE, 3PAR, FUD, Anti MS Tekhnet, Pro EE, #1Commented:
Have a look at this http://documentation.commvault.com/commvault/v10/article?p=products/windows/backup_troubleshooting.htm

Also just check if space on any of the related drives where the server is creating the snapshot are less than 20% free space total or not?
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Eric WoodfordSoftware Systems Specialist 3Commented:
Two similar situations we had.  TL;DR, check your drive space, you may be at or very near capacity.

Commvault wants to make a VSS. On our Exch 2010 environment, this landed on our DB mount points. Unfortunately many of our mount points were at or near capacity. This caused the VSS to not update. Checking the Volume Shadow copies and where they were 'landing', I moved a couple around to spare drives in the DAG. Now the VSS could be created and dbs backed up.

Corollary, our Commvault server was running low on storage space. This caused the opposite effect of 1. Instead the backups couldn't complete so it wasn't deleting the old VSS off the server. Checking the DBs, we had 4-5 VSS created for each, in some places, filling up my DB copies with 'hidden data'. We ended up having to change our CV solution so that the backups were smaller. More incrementals, less fulls. Retire backups so they dropped off in half the time, etc.
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pramod1Author Commented:
can this be a issue
vss-.PNG
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pramod1Author Commented:
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pramod1Author Commented:
it is reported event id 36
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