The size of global cache is specified in the properties of the target WAN accelerator. Global cache is stored on the target WAN accelerator, in the VeeamWAN folder on the disk that you select when you configure the WAN accelerator. You can disable the High bandwidth mode and switch back to the Low bandwidth mode at any time. If you are planning to use WAN acceleration in the Low bandwidth mode in the future, we recommend that you keep the global cache. If you are planning to use the High bandwidth mode for WAN acceleration and you do not need the global cache anymore, you can free the disk space by manually removing the cache. When you enable the High bandwidth mode for an existing WAN accelerator, Veeam Backup & Replication does not automatically remove the global cache that was previously used for acceleration. Global cache data is not used in the High bandwidth mode. The amount of disk space required for a source WAN accelerator operating in the Low bandwidth mode is calculated by the following formula:įor the target WAN accelerator operating in the High bandwidth mode only, you must provide enough free space to generate digest data. You must make sure that there is enough disk space on the source WAN accelerator to store digest data. Digests data is stored on the source WAN accelerator, in the VeeamWAN folder on the disk that you select when you configure the WAN accelerator. When you run a remote job over WAN accelerators, Veeam Backup & Replication analyses data blocks going to target and calculates digests for these data blocks. To avoid problems caused by the lack of free space when switching from the High bandwidth mode to the Low bandwidth mode, we recommend that you configure WAN accelerators as if you planned to use them in the Low bandwidth mode.

Besides, Veeam Backup & Replication will also use the global cache at the target WAN accelerator.

If you disable the High bandwidth mode and start a job which utilizes this WAN accelerator, Veeam Backup & Replication deletes digest data that was used in the High bandwidth mode and recreates it for the Low bandwidth mode. When configuring WAN accelerators, note that there can be situations when WAN acceleration switches from the High bandwidth mode to the Low bandwidth mode : for example, the link to the remote location changes and you decide to disable the High bandwidth mode for one of the accelerators in the pair. To ensure correct work of remote jobs over WAN accelerators, you must provide enough free space for service data on source and target WAN accelerators.

Veeam space calculator