{"id":4355,"date":"2019-11-09T03:58:17","date_gmt":"2019-11-09T03:58:17","guid":{"rendered":"https:\/\/pariswells.com\/blog\/?p=4355"},"modified":"2019-11-09T03:58:17","modified_gmt":"2019-11-09T03:58:17","slug":"how-to-detect-disk-data-change-on-vmware-vm-write-rate","status":"publish","type":"post","link":"https:\/\/pariswells.com\/blog\/research\/how-to-detect-disk-data-change-on-vmware-vm-write-rate","title":{"rendered":"How to detect Disk Data change on Vmware VM ( write rate )"},"content":{"rendered":"
\u00a0<\/div>
Enabling vCenter Server Data Collection<\/strong><\/div>
\u00a0<\/div>
To enable vCenter Server data collection:<\/div>
1.Connect to the vCenter Server.<\/div>
2 In the Administration menu item, selectvCenter Server Settings\u00a0 The vCenter Server Settings dialog is displayed.<\/div>
3. Select Statistics.<\/div><\/div>

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\u00a0<\/div>
4. Make sure that the Statistics Level value for all interval durations up to and including the one day duration is at least 2. If any of the durations have a value less than 2, do the following, starting with the smallest interval:<\/div>
a) Select the interval and clickEdit<\/div>
b) Change Statistics Level to\u00a0Level 2<\/div>
c) Click OK<\/div><\/div><\/div>

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\u00a0<\/div>
5. Repeat step 4 for all the values up to and including the 1 day interval duration.<\/div>
6. Click OK and wait for at least a day before using the aggregate usage data. Collecting Data Characteristics for VMs<\/div>
You can collect data characteristics for the virtual machines in a VPG in one of the following ways:<\/div>
\u00a0<\/div>
Via vSphere Client console performance statistics.<\/div>
\u00a0<\/div>
By running a script to collect the data characteristics.<\/div>
\u00a0<\/div>
Note: The script samples supplied with the download, require vSphere PowerCLI and permissions to access the vCenter Server using the script.<\/div><\/div><\/div>
\u00a0<\/div>
8 By using operating system performance monitors, such as the Microsoft Performance Monitor utility for Windows operating systems or the iostat<\/strong> command for Linux operating systems. Collect data for a minimum of one day. Collecting this information\u00a0impacts on performance and therefore the collection period should be long enough to gather a true representation of usage but not too long. The first procedure described below, to collect data characteristics for the VMs via the vSphere Client console performance statistics, uses<\/div>
a timeframe of one day and the second procedure, to collect data characteristics for the VMs by running a scri pt to collect the data characteristics uses a timeframe of seven days.<\/div>
\u00a0<\/div>
Note: When running vCenter Server versions before version 5.x, if any of the virtual machines use NFS storage, metrics for the<\/div>
NFS storage are not generated by the vCenter Server. To collect data characteristics for the VMs via the vSphere Client console performance statistics:<\/div>
1. In the vSphere Client console select the VM and open the Performance tab.<\/div>
2. Click\u00a0Advanced<\/div>
3 . Click the Charts Options link. The Customize Performance Chart dialog is displayed.<\/div>

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4. In Chart Options , drill-down in Disk and select Past day<\/div>
5. In Counters , click None to clear all the selections and then select Disk Write Rate<\/strong> or Write Rate<\/strong><\/div>
6. Click OK<\/div><\/div><\/div>
\u00a0<\/div>
9 A chart similar to the following is generated:<\/div>

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Use the chart for the average write rate of the VM.<\/div>
To collect data characteristics for the VMs via a script:<\/div>
Note:<\/div>
The following script and the samples supplied with the download, require vSphere PowerCLI and permissions to access<\/div>
the vCenter Server using the script.<\/div>
\u00a0<\/div>
Run a script similar to the following:<\/div><\/div><\/div>
\u00a0<\/div>
$report = @()<\/div>
Get-VM | %{<\/div>
$stats = Get-Stat -Entity $ -Stat disk.write.average -Start (Get-Date).adddays(-7) –<\/div>
ErrorAction SilentlyContinue<\/div>
if($stats){<\/div>
$statsGrouped = $stats | Group-Object -Property MetricId<\/div>
$row = “” | Select Name, WriteAvgKBps, WriteAvgMBps<\/div>
$row.Name = $_.Name<\/div>
$row.WriteAvgKBps = ($statsGrouped |<\/div>
where {$_.Name -eq “disk.write.average”} |<\/div>
%{$_.Group | Measure-Object -Property Value -Average}).Average<\/div>
$row.WriteAvgMBps = $row.WriteAvgKBps\/1024<\/div>
$row.WriteAvgKBps = “{0:N2}” -f $row.WriteAvgKbps<\/div>
$row.WriteAvgMBps = “{0:N2}” -f $row.WriteAvgMBps<\/div>
$report += $row<\/div>
}<\/div>
}<\/div>
$report | Export-Csv “C:\\ZertoOutput.csv”<\/div>
\u00a0<\/div><\/div><\/div>
\u00a0<\/div>
\u00a0<\/div><\/div><\/div>
\u00a0<\/div>
Note:\u00a0If you want a value other than seven days, change the value of the adddays() function. For example to collect data<\/div>
for three days, use adddays(-3)<\/div>
\u00a0<\/div>
Use the resulting file, C:\\ZertoOutput.csv , for the average write rate of the VM.<\/div>
Note: Versions of this script are included in the download with this document<\/div><\/div><\/div>","protected":false},"excerpt":{"rendered":"

\u00a0Enabling vCenter Server Data Collection\u00a0To enable vCenter Server data collection:1.Connect to the vCenter Server.2 In the Administration menu item, selectvCenter Server Settings\u00a0 The vCenter Server Settings dialog […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[3082,3084,594,3083,2449],"class_list":["post-4355","post","type-post","status-publish","format-standard","hentry","category-research","tag-disk-data-change","tag-stats","tag-vmware","tag-write-rate","tag-zerto"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t