VMware Technology Day 2016 Taiwan

CPU Performance
- Ready time need to know
  - High CPU usage -> Best Virtualization utilization for enterprise, not really the CPU resource is exhausted
- Higher Ready time -> Wait for Physical CPU Ready for a long time -> may be the CPU exhausted with High CPU usage
- resxtop
  - V for show vm only
  - e for show the world of specified vm
- Not to use SMP (1 CPU 1 vCPU)
Memory Performance
- vm memory usage strategy: on demend -> will not return back memory
  - Transparent page sharing has security issue, so default disabled, but can be enabled if needed
  - Balloon
  - Memory compressed
  - Host-level swapping -> will degrade the vm performance extremely -> need to check
- consumption memory vs. Active memory
- resxtop/esxtop
  - m to show memory usage
  - state
    - high or medium use ballon or not
    - Low use host-level swapping or vm doesn't have balloon driver (vmtools)
Network performance
- emulation and sharing
  - vmtools need to be installed, virtual network adapter will be shared, not emulated
  - vmxnet3 / vmxnet2 / vmxnet (determined by host nic)
- Jumbo frames
- resxtop
  - n to show network stats
- make baseline
  - make baseline when somedays which nothing happened, average or statistics
- drop network packets
- Drop received packets
  - guest os cpu performance low
- drop transmit packets
Storage performance
- Determined the requests
- queue and lun queue depth
  - max recommended queue depth is 64
- Disk throughput
  - resxtop
    - d to show disk stat
    - u to show queue stat
    - Actv and qued
- Command abords for overloaded storage, must be 0
- Slow storage
  - DAVG on average > 10 ms and peak > 20 ms
vSAN
- in one disk group, vmware prefer ssd:hd = 1:10
- Availability
  - vm mirroring: number of replication
  - Striping: slice one vm into multiple part on disks
  - All can mix to perform
- Flash read cache reservation
  - on ssd read cache:write buffer=7:3, fixed
  - For critical mission, reserv read cache to boost performance, and let other mission degrade performance

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