Cezar Moise comments

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                                            Cezar Moise

Add testcase that adds larger instance while having 90% storage utilization

> What was the time to scaleout? Didn't calculate exactly, but from graph aprox 15 minutes. Updated: https://github.com/scylladb/scylla-cluster-tests/issues/9257#issuecomment-2483382654

Add testcase that adds larger instance while having 90% storage utilization

Updated results. Failed on adding a 3rd nodes and had huge latencies. Might be caused by high load. Will run again with lower load.

Add testcase that adds larger instance while having 90% storage utilization

Updated results with a run @ 80% load, will run a new one with something closer to 50%

Add testcase that adds larger instance while having 90% storage utilization

Updated results with runs at 70% and 50% load.

Add testcase that adds larger instance while having 90% storage utilization

I managed to get it to green with 150 treads, 3400/s, but adding 2XL. Will try again with 4XL Maybe the threads was the cause, i4i.large only 2 vCPUs (https://aws.amazon.com/ec2/instance-types/i4i/)

Add testcase that adds larger instance while having 90% storage utilization

Updated with mixed workload at 'threads=150 fixed=3400/s', no more latency issues

Add testcase that adds larger instance while having 90% storage utilization

Add testcase that adds larger instance while having 90% storage utilization

Added run for 2025.2 Can see improvements Reduced initial write from `-rate threads=200` to `-rate threads=150` ![Image](https://github.com/user-attachments/assets/fd583ad2-98e2-48b5-a8b7-4a89287efce7)

Add testcase that adds larger instance while having 90% storage utilization

Updated with run using 3 racks

Some tables don't get streamed to new nodes in heterogenous rack

cc: @pehala @tgrabiec