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Replication over a high-bandwidth, high-latency network is slow High replication lag Default replication settings do not achieve expected throughput Applies To: All Data Domain systems using replication
Default network parameters are optimized for: Low-latency local networks (such as, <1 ms RTT) Moderate WAN latency (up to 50–100 ms) For high-bandwidth, high-latency links , the default settings underutilize available bandwidth because acknowledgments take longer to return, limiting throughput.
Step 1: Calculate Bandwidth-Delay Product. The bandwidth-delay product determines how much data can be in transit before acknowledgments return. Formula: Bandwidth (Bytes/sec) × Delay (seconds) = Bandwidth-Delay Value If the value exceeds 100,000 bytes , tuning replication options can improve performance. Step 2: Measure Bandwidth Use iperf on both source and destination Data Domain systems: Destination (server mode): # net iperf server Source (client mode): # net iperf client <destination IP> duration 30 interval 3 nodelay Convert the result from Mbits/sec to Bytes/sec: Example: 4.92 Mbits/sec = (4,920,000 ÷ 8) = 615,000 Bytes/sec Step 3: Measure Delay Use net ping from source DD: # net ping <destination IP> path-mtu do packet-size 1472 count 5 Example output: time=173 ms → Delay = 0.173 seconds Step 4: Compute Bandwidth-Delay 615,000 Bytes/sec × 0.173 sec = 106,395 Bytes (~106 KB) Since this exceeds 100,000, tuning is recommended. Step 5: Configure Replication Options. Disable replication: # replication disable all # replication status Wait until the status shows disconnected . Set bandwidth: # replication option set bandwidth 615000 Set delay: # replication option set delay 173 Restart filesystem: # filesys restart Re-enable replication: # replication enable all Tip: Set replication throttle to 90–95% of link bandwidth for best results. Undo Changes | Reset to Default: # replication disable all # replication option reset bandwidth # replication option reset delay # filesys restart # replication enable all
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