Performing VM backup in Microsoft’s Hyper-V virtual environment may not seem to be an easy task at first. If the backup process is not configured correctly, things could go wrong.
Regularly do hyper-v backup and recovery for your VMs. It will help you to keep your data safe and recoverable.
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The longer the backup tool is copying the checkpoint (backup), the more changes are logged in the delta files. If there are many changes in the VM while the checkpoint is being copied, merging files after deleting the checkpoint may high load the storage subsystem, the Hyper-V host and the VM itself. It means that it is better to copy the checkpoint as quickly as possible. In Hyper-V Server 2016, the Resilient Changed Tracking (RCT) technology is used to make backup faster due to copying only the blocks of data changed since the last backup. Thus, you do not need to copy the VM as a whole.
When copying the VM checkpoint data over LAN from the Hyper-V host to the backup storage, the network may be highly loaded. So it is better to use a separate server network or HBA interface for the backup traffic or copy the data over SAN.
Based on the points described above, when using external data storage to store VM files, you can use the features of data storage integration with the backup product (such a hardware snapshots).
Originally, the guest OS does not know that it is backed up. So when trying to restore a VM from that backup, the OS tries to continue its operation since the moment the checkpoint has been created. In some cases it may result in some issues in the OS itself and losing data in the running apps (especially in transaction ones, like Exchange, SQL, ADDS, etc.). To solve this problem, a new checkpoint type — Production Checkpoints appeared in Hyper-V 2016. (Microsoft recommends using Standard Checkpoints only in test or laboratory environments or to backup stopped VMs.)
checkpoints are working due to Hyper-V integration tools in the guest OS and are based on Volume Shadow Copy (Windows) or file system freezing daemon on Linux (fsfreeze). However, the state of the memory is not copied. It means that Hyper-V notifies the guest OS of creating a checkpoint, the app supporting VSS consolidation ends up the current transactions, goes into a consistent state and the VM checkpoint is created. When recovering from a checkpoint, the guest OS is powered off (since the memory state has not been saved), and after being turned on it thinks that an emergency shutdown has occurred. The app (if it supports VSS) starts working from the saved consistent state.
To store virtual machine backups you need quite a lot of space. The more often you make checkpoints, the more place you need in the backup storage. Typically, you can use the Data Deduplication technology (integrated in Windows Server) or the deduplication solution from the backup provider. If you are using differential disks, choose the backup tool that supports this technology. Otherwise you can store the same VM data several times.
If the density of VMs on the host is high, it is worth to plan the backup time to prevent high load on the productive systems in the working hours.
If you have to store multiple VM copies for several days, you will have to manage the number of the stored VM copies (you can automatize backup management using scripts or your backup tool features).
Backup monitoring tools are also important. It would be frustrating to learn that you cannot back up something due to the lack of free space in the data storage. The backup verification tool is also recommended.
Quite often you have to recover a certain file from a VM backup. Some backup/recovery products allow fine-grained recovery of files/folders without the need to restore the whole VM or its virtual disk.
You can split the access privileges with the role-based backup management model (it is relevant for administrators responsible for different system or device groups).
Don’t forget about implementing the traditional backup strategy 3-2-1 (three copies on two different media with one of them being stored on a remote site).
Regards,
Bruce