Article number
000003040
Affected Versions
All
Source Hypervisor
All
Target Hypervisor
All

Problem with Initial Sync Showing High Throughput but Low WAN Traffic

Viewed 305 times

Summary

An administrator may notice during an initial sync that the performance graphs/data tables in the Zerto GUI show high throughput but low WAN traffic.

Root Cause

Protected VRA reads the protected disk and verifies each 128K block.

A 128K block with all zeroes is delivered as meta-data only - an indication that the block is all zeroes.

Should a 128K block of data be nearly all/mostly zeroes, this would explain why the throughput is high (VRA is reading the block on disk) and the WAN traffic is low (sending metadata and minimal 'real' data).

Symptoms

During initial sync, customer observes high throughput but low WAN traffic.

Solution

There is no solution as this is expected behavior.