Cluster scaling

Using FoundationDB
1

Hi, maybe some body can suggest how scale cluster.
I have cluster with config:

  • 14 VM with 2 CPU, 10GB RAM, 200Gb (limits 5.5K IOPS 100Mb/s per VCPU)
  • 4 VM with transaction + stateless
  • 10 VM with storage + stateless, by 5VM each zone
  • redundancy mode = double
  • 5 coordinators, 1 GRV, 3 commit proxy

For performance I lauch test like this:

; This file is used by the Atlas Load Generator
    testTitle=RandomReadWriteTest
    testName=ReadWrite
    testDuration=300.0
    allowedLatency=0.025
    transactionsPerSecond=20000
    writesPerTransactionA=0
    readsPerTransactionA=5
    writesPerTransactionB=1
    readsPerTransactionB=1
    ; Fraction of transactions that will be of type B
    alpha=1
    nodeCount=10000000
    valueBytes=3800
    minValueBytes=3400
    discardEdgeMeasurements=false
    warmingDelay=20.0
    timeout=300000.0
    databasePingDelay=300000.0

I receive result with 12K TPS. When run test all log & storages have 98% disk IO. But they used only 3 from 4 log instances. By monitoring logs and storage are used all quote for CPU.

How can I improve write performance? Maybe I can add transaction instances for sharding write workload?