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Druva Documentation

Setting lower bandwidth cap for inSync backups over LAN and WAN


This article describes how you can configure inSync Server to respond to backup and restore requests in situations where fluctuating connectivity is expected. inSync administrators might find this article useful.

This article is applicable for versions 4.5.1 and later of inSync Professional, Enterprise and Private Cloud. 


If you set the bandwidth for your inSync setup as a percentage value of the available bandwidth, you can ensure that your inSync setup works at all bandwidths within the defined bandwidth limits. To do this, you must modify the WANBW_LOWCAP and LANBW_LOWCAP parameters in the inSyncServer. cfg (Windows and Linux file).

Note: The “LOWCAP” settings work only if bandwidth throttling is defined as a percentage value of available bandwidth.

The WANBW_LOWCAP and LANBW_LOWCAP parameters indicate the amount of bandwidth (in bytes) that can be consumed by backups when the connectivity is low (typically, 64 KB/sec for LAN and 16 KB/sec for WAN). The default value of WANBW_LOWCAP is 16 KB while the default value of LANBW_LOWCAP is 64 KB.

Before you begin, stop the inSync Server.

To set the WANBW_LOWCAP and LANBW_LOWCAP parameters:

1. Stop the inSync Server (Enterprise and Professional editions) or the Master Server (Private Cloud).

2. Locate the inSyncServer file.

For Enterprise and Professional Editions:

  • (Windows): C:\inSyncServer4\inSyncServer.cfg
  • (Linux): /etc/inSyncServer/inSyncServer.cfg

For Private Cloud:

  • (Windows): C:\inSyncCloud\inSyncServer4\inSyncServer.cfg
  • (Linux): /etc/inSyncCloud/ inSyncServer4/inSyncServer.cfg

Note: 5.4 onwards the location is C:\ProgramData\Druva\inSyncCloud\Logs for Windows and /etc/inSyncCloud and /var/log/inSyncCloud for Linux.

3. Open inSyncServer in a word editor.

4. Locate the WANBW_LOWCAP and LANBW_LOWCAP parameters.

5. Set these parameters to a value (expressed in bytes) that indicates the bandwidth that will be consumed when     connectivity is low.

6. Save your changes.