Veeam B&R - Excessive workload on Storage during backup

Veeam backup can create problems to your storage that is exposed as iscsi/shared folder due to two principal reasons:

1. Concurrent snapshots/Backups that is managed in this section:

2. Excessive storage stress that can be limited here:

3. About hyperV you can revies this screenshot and relative register key:

2 registry values under HKLMSOFTWAREVeeamVeeam Backup and Replication key:

MaxVmCountOnHvSoftSnapshot (DWORD)
MaxVmCountOnHvHardSnapshot (DWORD) registry values

about theory you can review these most exhaustive articles:

Introducing Backup I/O Control in Veeam Backup & Replication

VEEAM Invests in Faster & More Efficient Data Protection With Backup & Replication 8