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in blueprint - 13 Feb, 2016
by mordi - no comments
VCP6-DCV blueprint section 7 – Objective 7.4: Troubleshoot and Monitor vSphere Performance

In this post i will continue to cover the troubleshooting objective and now its time for troubleshoot and Monitor vSphere Performance

The following are the objective from the blueprint:

  • Monitor CPU and memory usage
  • Identify and isolate CPU and memory contention issues
  • Describe and differentiate common metrics, including:
    • Memory
    • CPU
    • Network
    • Storage
  • Monitor performance through esxtop
  • Compare and contrast Overview and Advanced Charts
  • Troubleshoot Enhanced vMotion Compatibility (EVC) issues

 

Monitor CPU and memory usage 

You can monitor the performance for the Datacenter/Cluster or individual ESXi hosts.

pref1

 

Compare and contrast Overview and Advanced Charts:

you can also look at the Advanced chart and configure what will you like to monitor , this really helps when you try to isolate an issue.

pref2point1

Monitor performance through esxtop:

Run the command esxtop on a host, with this command you can get a LOT of information about your ESXi hosts resources.

to get more information about the command you can use the ? and then you can switch views for example click on “m” for memory usage

esxtop1

by clicking on “f” you can control how many columns you can see .

esxtop2

If you like to view only the VMs information click “V”

esxtop3

 

Describe and differentiate common metrics, including:

  • Network
  • Storage

CPU:

  • %USED – CPU cycles used.
  • %RUN = % of CPU time used – High %RUN means CPU is been used heavily
  • %SYS = % of time used by system services – High %SYS mean heavy I/O is been used
  • %VMWAIT = %WAIT-%IDLE – High %VMWAIT can indicate resource latency
  • %RDY = % of time of an object that was ready to run  but was block due to CPU resources , watch your reservations and shares
  • %OVRLP – Time spent on behalf of a different resource pool/VM

esxtop4

 

Memory:

  • MEMSZ – Amount of phyiscal memory allocated to a resource pool or VM.
    GRANT – Guest memory mapped.
    SZTGT  – Amount the VMkernel wants to allocate.
    TCHD  – Working set estimate.
    %ACTV – % guest physical memory referenced by the guest.
    %ACTVS – Slow moving version of the %ACTV
    %ACTVF – Fast moving version of the %ACTV
  • %ACTVN – Estimation. (This is intended for VMware use only)
    MCTL – Memory balloon drive installed or not.
    MCTLSZ (MB) – Amount of physical memory reclaimed by ballooning.
    MCTLTGT (MB) – Attempts to reclaim by ballooning.
    MCTLMAX (MB) – Maximum that can be reclaimed by ballooning.
    SWCUR (MB) – Current swap used.

 Network:

  • PKTTX/s – packets per seconds
  • MBTX/s – Megabit per second
  • %DRPTX – % dropped packets transmitted
  • %DRPRX – % dropped packets received

Storage:

  • CMDS/s – Number of commands issued per second.
  • READS/s – Number  of read commands issued per second.
  • WRITES/s – Number of write commands issued per second.
  • MBREAD/s – MB reads per second.
  • MBWRTN/s – MB written per second.
  • DAVG/cmd – AVG responses time between host HBA and storage device per storage command – high number insufficient storage HW
  • KAVG/cmd – AVG responses time from VMkernel for storage commands – 0> mean latency due to the ESX Kernel’s command
  • GAVG/cmd – sum of DAVG and KAVG
  • QAVG/cmd –  average queue latency – 0> mean latency

Troubleshoot Enhanced vMotion Compatibility (EVC) issues

Please refer to this KB for more infomation about EVC : http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1005764

 

Thanks for reading

Mordi.

 

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