In this article, we will show you how to remove the missing storage volume from System Center Data Protection Manager and fix the disk storage volume crash with error ID: 917.
In This Article
DPM is well recognized in the industry for the protection of Microsoft workloads and environments. With DPM 2016, you can back up the most common workloads in a modern data center. DPM can backup various business workloads such as the following which might be running on physical machines, Hyper-V, VMware, or in Microsoft Azure:
- Exchange Server
- SQL Server
- SharePoint Server
- Microsoft Dynamics
- Windows Server
- Hyper-V VMs
- System States and Active Directory
- Windows clients
You can install SCDPM in different ways. Please refer to the below articles where we described in detail how to install System Center Data Protection Manager, you can choose the installation method that suits your needs:
- How to install SCDPM 2016 on Windows Server 2016 and SQL Server 2016
- How to Automate the installation of SCDPM 2016 on Windows Server 2016
- How to Deploy SCDPM 2016 using SCVMM 2016 on Windows Server 2016
I was working recently on System Center Data Protection Manager (SC DPM) that has some free space problems on the Modern Backup Storage (MBS) volume in Windows Server 2016.
The DPM Server is deployed in a VM and we are leveraging Data Deduplication. Check the following article to learn more on how to reduce DPM 2016 storage by enabling deduplication on Modern Backup Storage.
DPM Modern Backup Storage (MBS)
In System Center Data Protection Manager 2016, Microsoft announced a new backup option called Modern Backup Storage (MBS). MBS helps achieve 50% storage savings using ReFS technology, and 3 times faster backup using ReFS block cloning, which uses Allocate-on-write, as opposed to copy-on-write used by Volume Snapshot in DPM 2012 R2.
Modern Backup Storage (MBS) helps also achieve much more efficient storage utilization using Workload Aware Storage. Workload Aware Storage enables you to configure DPM to store your backups on a high or low performant volume based on the workloads.
DPM 2016, 2019, and 2022 uses by default Modern Backup Storage, please note that you can still use the old disks storage technology used by DPM 2012 R2, but we advise customers to start using the new Modern Backup Storage.
The issue we came across is the following:
1) The Backup Storage Volume is removed from DPM virtual machine but not from the DPM console.
2) All protection groups were removed prior to detaching the backup storage.
3) DPM server reports missing volume in Disk storage pane.
4) Attempting to remove the missing volume from the DPM console results with the following error. The console keeps crashing constantly.
5) Attempting to remove the same volume using PowerShell, the PowerShell console crashed as well.
6) Adding a new volume with the same drive letter and size, and then trying to remove the missing volume. The console also crashed.
7) I attempted to restart the DPM server and service which didn’t fix the problem either.
Fixing the issue
To fix this issue, you need to open a command prompt as Administrator and run the following command:
DpmSync is a command-line tool that exists since SC DPM 2007 which enables you to synchronize the DPM database with the state of the disks in the storage pool and with the installed protection agents. The DpmSync tool restores the DPM database, synchronizes the DPM database with the replicas in the storage pool, restores the Report database, and reallocates missing replicas.
As soon as DPM Synchronization was completed, I was able to remove the missing storage volume from DPM.
That’s it! Hope this helps.
Do you want to learn more about System Center Data Protection Manager and how to create a hybrid-cloud backup solution? Make sure to check my recently published book: Microsoft System Center Data Protection Manager Cookbook.
With this book (over 450 pages) on your side, you will master the world of backup with System Center Data Protection Manager and Microsoft Azure Backup Server deployment and management by learning tips, tricks, and best practices, especially when it comes to advanced-level tasks.