I have two V5030 id different DC's running native IP replication between them, using GM changed volumes on IBM i host with 72 volumes=20TB. Even though I have 1Gbps link bandwidth the replication can't sustain more than 30-40MBps. The network has been tested and FTP and other transfer are able to sustain 90-100MBps speeds, but not for the replication. The remote partnership on the V5000's are configured to use compression and set for 1000Mbps=1Gbps, 100% background copy rate. I'm using 1 Remote Copy Group with ports 2 on each node assigned to it.
IBM support identified that I have 1.5% lost packages on 15 minute interval and therefore the bad replication throughput, but network team can't see any lost packages on the ports I use for the replication. I also see a very strange behavior, when I switch off the compression of the partnership the replication bandwidth goes below 10MBps.
Any ideas would be helpful.