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Druva Documentation

Network parameter reference

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Druva does not recommend and/or mandate changing the environment to comply with the parameter values specified in this article. Instead, the objective is to help you to obtain optimal functionality from the application in the most efficient manner possible. inSync does not govern these values, as these are set at the RPC level of the TCP/IP stack of the application and hence handled by the underlying stack.

You can use these values as a reference to achieve your expected network performance or to handle possible environmental issues regarding backups and restores.

Network parameter reference values

Parameter Value Remarks
Maximum permitted MTU size 1500 bytes Default limit
Minimum permitted MTU size 576 bytes for IPv4
1289 bytes for IPv6
Recommended MTU size 1460 bytes with 20 bytes for TCP Header and 20 bytes for IP Header for a total of 1500 bytes  

Maximum permitted Jitter

Since Jitter may adversely impact an application performance, Druva recommends no or minimal Jitter in the environment. 

What is Jitter?
Jitter in IP networks is the variation in the latency on a packet flow between the two systems, when some packets take longer to travel from one system to the other.

What causes Jitter?
Jitter results from network congestion, timing drift and route changes.

Why is Jitter problematic?

  • Jitter is especially problematic in real-time communications like IP telephony and video conferencing.
  • It is also a serious problem for hosted desktops and virtual desktop infrastructure (VDI).
  • Jitter can lead to audio and video artifacts (unintended deviation or inconsistency) that degrade the quality of communications.
TCP window sizing for WIN10 / WIN7 desktop machines  Less than 4 MB This is best handled by the underlying operating system and is not a function of the inSync.

Maximum permitted size of file transfer

Optimal restore speed depends on the data set, as there is no specific number. Observations have revealed the restore speed in the range of  20 GB/Hr to 100 GB/hr depending on file sizes, file types and more.

The backups are observed to be optimal at 100 GB/hr for file sizes between 1 MB to 4 MB. The performance is suboptimal for other extremes of file sizes.


Network latency requirements
Minimum latency 0 ms  
Maximum latency 40 ms  
Recommended permissible latency 20 ms For best performance, lesser latency the better. 

Druva does not have a reference document for network parameter values as it is handled by the underlying OSI stack  at the RPC level for the inSync application. 

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