Veeam Backup & Replication 10
User Guide for Microsoft Hyper-V
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Choosing VSS Provider (Microsoft Hyper-V Server 2012 R2 and Earlier)

Before you configure backup jobs, it is recommended that you decide what VSS provider will be used to create and maintain volume shadow copies.

By default, Veeam Backup & Replication automatically selects a VSS provider on every volume. Every 4 hours it rescans all Microsoft Hyper‑V hosts added to the backup infrastructure and updates information about connected volumes. Veeam Backup & Replication also collects information about software and hardware VSS providers available on every volume.

If hardware providers are available, Veeam Backup & Replication selects a hardware provider to create volume shadow copies on a volume. If no hardware providers are installed, Veeam Backup & Replication selects the VSS system software provider. If necessary, however, you can assign a VSS provider on every volume manually.

If both software and hardware providers are available for a volume, it is recommended that you select a hardware provider. Although software providers are generally applicable to a wider range of storage platforms, they have a number of limitations:

If a hardware provider is used to take a snapshot in such case, the CSV stays in the redirected mode while the snapshot is taken. After a volume shadow copy is created, the CSV resumes direct I/O.

If a software provider is used to take a snapshot, the CSV stays in the redirected mode until the backup process completes. If large virtual disks are processed, backup time can be significant.

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