Backing up Windows Server 2012 R2 Clustered Hyper-V


      I am currently setting up a customer with a Dell VRTX server with 2 nodes. Both nodes contain Server 2012 R2 and are clustered with high availability Hyper V.  Sepparately to that, I have a synology disk station for local backups and I have connected them to the nodes through iSCSI and have created another CSV storage for the backup.  When using the windows builtin backup I keep getting event id 521 from backup source.  Enclosed is the reading:

"The backup operation that started at '‎2015‎-‎06‎-‎20T21:28:21.792000000Z' has failed because the Volume Shadow Copy Service operation to create a shadow copy of the volumes being backed up failed with following error code '0x81000113'. Please review the event details for a solution, and then rerun the backup operation once the issue is resolved."

Can anyone shed some light on this?  the VM's are housed within the VRTX shared storage of the chasis.  The iSCSI connections to the synology are planned strictly for backups.   Any help would be greatly appreciated.

Thank You!! =)
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Philip ElderTechnical Architect - HA/Compute/StorageCommented:
Curiosity question: Dual SPERC? If yes, has Dell resolved the performance issues with dual SPERC and parity RAID (5/6)?

If no, then that's your single point of failure (SPF) and thus defeats the purpose of a cluster.

I suggest backing up via wire (Gigabit or 10GbE) using a third party. iSCSI will turn around and bite you. BTDT.

We use a third party product by StorageCraft to back up most of our clusters. We are currently investigating Veeam as an alternative for our larger cluster deployments.

The error probably indicates a disk subsystem saturation issue.
novatsAuthor Commented:
It does have a dual PERC though it is currently disabled as I had read about the performance issue and i haven't tested yet.  The system is not in production yet but we definately need to test it before it goes online.

In regards to the 3rd party software we will be implementing max backup, though we need windows backup as a temporary measure while the software is approved.
Philip ElderTechnical Architect - HA/Compute/StorageCommented:
Constrained Delegation can be used to allow the nodes to access a VHDX on a USB drive (NTFS). Attach the VHDX to the VM via SCSI bus. Works way better, especially for rotation, than iSCSI does.

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novatsAuthor Commented:
Good solution
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Windows Server 2012

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