Zerto behavior as a Result of Packet Loss Between Sites

KB Number:
000001046

Symptoms:
When experiencing packet loss across ZVM connectivity link, the following issues might occur:
  1. Unable to pair sites.
  2. Site-to-site disconnection between a ZVM pair.
  3. Prolonged or unexpected Zerto sync operations (relevant for Self -replicating setup only?).

Cause:
The following is a list of common packet loss causes:
  1. Link Congestion (an event where a network device has to discard old queue information before it is able to processĀ it).
  2. Different network components and consumers (such as Zerto's VRAs) are using different MTU values on the same network.

Solution:

Possible solutions include (but are not limited to) the following:

  1. Verify that all Zerto components (VRA, ZVM etc) are configured with the correct MTU value using the following KB - http://www.zerto.com/myzerto/knowledge-base/packet-fragmentation-caused-by-mtu/
  2. Increase the bandwidth of the congested link(s)
  3. Implement Quality of Service (QoS) and set high priority to ZVM-related traffic
  4. Verify that all network equipment can handle your maximum throughput, or potentially cluster additional hardware to increase throughput

Affected Versions:
All version

Hypervisor:
VMWare, Hyper-V

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