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Cisco Bug: CSCvs97460 - Investigation and Fix of replication in low BW networks

Last Modified

Jul 13, 2020

Products (1)

  • Cisco HyperFlex HX-Series

Known Affected Releases

4.0(2a) 4.5(1a)

Description (partial)

Symptom:
When the cross data-center replication link bandwidth varies from value set by the customer in the HX UI pane for replication during pairing, Springpath controllers would not auto-tune the rate of transmission. This would lead to missing heartbeats and failure to replicate the data across the cluster. We would see replication failures at the UI layer. In addition, in low bandwidth and high latency network, large number of failures would occur due to non-adaptive nature of the replication rate.This enhancement would support varying link bandwidth and a bandwidth drop in link of upto  50% of configured replication bandwidth in HX by automatically controlling rate of transmission.

Conditions:
Low bandwidth < 50Mbits. High latency > 30ms. Varying Bandwidth 0 to 50Mbits and sharing the bandwidth with multiple application along with the replication stream. The replication link bw available is less than 50% of the replication bw configured in HX UI.
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