read/write latency average lun 24 hours a day

How can I get medium and playback latency of writing for each LUN via PS?  I know how to get the latest version, but does not know how to get a 24 hours on average.  If it's important storage we use iSCSI is shared between three servers essentials ESXi with vCenter running in a virtual machine.

Thank you...

Can of course.

First let's look at the available historical intervals

Get-StatInterval | select Samplingperiodsecs, name,  storagetimesecs

This will show

  SamplingPeriodSecs Name                                                                                StorageTimeSecs
  ------------------ ----                                                                                ---------------
                 300 Past Day                                                                                86400
                1800 Past Week                                                                                604800
                7200 Past Month                                                                                2592000
               86400 Past Year                                                                                31536000

To only watch the first 2 columns, do you see the historical intervals 1-4

In minutes/days, what gives

Historical Interval 1    5 minutes
Historical Interval 2    30 minutes
Historical Interval 3    120 minutes
Historical Interval 4    1 day

In addition to the name in the second column, the third column shows how much time you will have access to statistical data of this interval.

For example, interval of 1 history with the 5 minute interval is kept for 1 night.

If we get statistics of 1 day ago, we will liquidate history interval 2, with the interval of 30 minutes.

Let's get some stats

$esxName = 
# Sample instance
$tgtInstance = "naa.600507680180809ed000000000000179"

$stats = Get-Stat -Entity (Get-VMHost $esxName) `
          -Stat "disk.deviceReadLatency.average" `
          -Start (Get-Date).AddDays(-2) `
          -Finish (Get-Date).AddDays(-1) | `
          where{$_.instance -eq $tgtInstance}

As see you in the settings - Start and - finishing we call statistics data between 48 and 24 hours.

All sampling intervals will be 30 minutes (interval 2 historical).

To get the average day you can do

$dayAvg = ($stats | Measure-Object -Average -Property Value).Average

Now suppose we recover more than 1 day of data and we want that day averages, you could do that

$esxName = 
# Sample instance
$tgtInstance = "naa.600507680180809ed000000000000179"

$stats = Get-Stat -Entity (Get-VMHost $esxName) `
          -Stat "disk.deviceReadLatency.average" `
          -Start (Get-Date).AddDays(-5) `
          -Finish (Get-Date).AddDays(-1) | `
          where{$_.instance -eq $tgtInstance}
$dayStats = $stats | Group-Object -Property {$_.Timestamp.Day}
$dayStats | %{
     $dayAvg = ($_.Group | Measure-Object -Average -Property Value).Average
     Write-Host "Day" $_.Name $dayAvg
}

What about what you are looking for?

Tags: VMware

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