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                    <h1 id="test-dbadiskspeed">Test-DbaDiskSpeed</h1>
<table>
<thead>
<tr>
<th></th>
<th></th>
</tr>
</thead>
<tbody>
<tr>
<td><strong>Author</strong></td>
<td>Chrissy LeMaire (@cl), netnerds.net</td>
</tr>
<tr>
<td><strong>Availability</strong></td>
<td>Windows, Linux, macOS</td>
</tr>
</tbody>
</table>
<p> </p>
<p>Want to see the source code for this command? Check out <a href="https://github.com/dataplat/dbatools/blob/master/public/Test-DbaDiskSpeed.ps1">Test-DbaDiskSpeed</a> on GitHub.
<br>
Want to see the Bill Of Health for this command? Check out <a href="https://dataplat.github.io/boh#Test-DbaDiskSpeed">Test-DbaDiskSpeed</a>.</p>
<h2 id="synopsis">Synopsis</h2>
<p>Obtains I/O statistics based on the DMV sys.dm_io_virtual_file_stats</p>
<h2 id="description">Description</h2>
<p>Obtains I/O statistics based on the DMV sys.dm_io_virtual_file_stats:</p>
<p><a href="https://docs.microsoft.com/en-us/sql/relational-databases/system-dynamic-management-views/sys-dm-io-virtual-file-stats-transact-sql">https://docs.microsoft.com/en-us/sql/relational-databases/system-dynamic-management-views/sys-dm-io-virtual-file-stats-transact-sql</a></p>
<p>This command uses a query from Rich Benner<br />
<a href="https://github.com/RichBenner/PersonalCode/blob/master/Disk_Speed_Check.sql">https://github.com/RichBenner/PersonalCode/blob/master/Disk_Speed_Check.sql</a></p>
<p>...and also based on further adaptations referenced at <a href="https://github.com/dataplat/dbatools/issues/6551#issue-623216718">https://github.com/dataplat/dbatools/issues/6551#issue-623216718</a></p>
<h2 id="syntax">Syntax</h2>
<pre><code>Test-DbaDiskSpeed
    [-SqlInstance] &lt;DbaInstanceParameter[]&gt;
    [[-SqlCredential] &lt;PSCredential&gt;]
    [[-Database] &lt;Object[]&gt;]
    [[-ExcludeDatabase] &lt;Object[]&gt;]
    [[-AggregateBy] &lt;String&gt;]
    [-EnableException]
    [&lt;CommonParameters&gt;]

</code></pre>
<p> </p>
<h2 id="examples">Examples</h2>
<p> </p>
<h5 id="example-1">Example:  1</h5>
<pre><code>PS C:\&gt; Test-DbaDiskSpeed -SqlInstance sql2008, sqlserver2012
</code></pre>
<p>Tests how disks are performing on sql2008 and sqlserver2012.<br></p>
<h5 id="example-2">Example:  2</h5>
<pre><code>PS C:\&gt; Test-DbaDiskSpeed -SqlInstance sql2008 -Database tempdb
</code></pre>
<p>Tests how disks storing tempdb files on sql2008 are performing.<br></p>
<h5 id="example-3">Example:  3</h5>
<pre><code>PS C:\&gt; Test-DbaDiskSpeed -SqlInstance sql2008 -AggregateBy &quot;File&quot; -Database tempdb
</code></pre>
<p>Returns the statistics aggregated to the file level. This is the default aggregation level if the -AggregateBy param is omitted. The -Database or -ExcludeDatabase params can be used to filter for <br>
specific databases.<br></p>
<h5 id="example-4">Example:  4</h5>
<pre><code>PS C:\&gt; Test-DbaDiskSpeed -SqlInstance sql2008 -AggregateBy &quot;Database&quot;
</code></pre>
<p>Returns the statistics aggregated to the database/disk level. The -Database or -ExcludeDatabase params can be used to filter for specific databases.<br></p>
<h5 id="example-5">Example:  5</h5>
<pre><code>PS C:\&gt; Test-DbaDiskSpeed -SqlInstance sql2008 -AggregateBy &quot;Disk&quot;
</code></pre>
<p>Returns the statistics aggregated to the disk level. The -Database or -ExcludeDatabase params can be used to filter for specific databases.<br></p>
<h5 id="example-6">Example:  6</h5>
<pre><code>PS C:\&gt; $results = @(instance1, instance2) | Test-DbaDiskSpeed
</code></pre>
<p>Returns the statistics for instance1 and instance2 as part of a pipeline command<br></p>
<h5 id="example-7">Example:  7</h5>
<pre><code>PS C:\&gt; $databases = @('master', 'model')
</code></pre>
<p>$results = Test-DbaDiskSpeed -SqlInstance sql2019 -Database $databases<br>
Returns the statistics for more than one database specified.<br></p>
<h5 id="example-8">Example:  8</h5>
<pre><code>PS C:\&gt; $excludedDatabases = @('master', 'model')
</code></pre>
<p>$results = Test-DbaDiskSpeed -SqlInstance sql2019 -ExcludeDatabase $excludedDatabases<br>
Returns the statistics for databases other than the exclusions specified.<br></p>
<h3 id="required-parameters">Required Parameters</h3>
<h5 id="sqlinstance">-SqlInstance</h5>
<p>The target SQL Server instance or instances. <br></p>
<table>
<thead>
<tr>
<th></th>
<th></th>
</tr>
</thead>
<tbody>
<tr>
<td>Alias</td>
<td></td>
</tr>
<tr>
<td>Required</td>
<td>True</td>
</tr>
<tr>
<td>Pipeline</td>
<td>true (ByValue)</td>
</tr>
<tr>
<td>Default Value</td>
<td></td>
</tr>
</tbody>
</table>
<h3 id="optional-parameters">Optional Parameters</h3>
<h5 id="sqlcredential">-SqlCredential</h5>
<p>Login to the target instance using alternative credentials. Accepts PowerShell credentials (Get-Credential).<br />
Windows Authentication, SQL Server Authentication, Active Directory - Password, and Active Directory - Integrated are all supported.<br />
For MFA support, please use Connect-DbaInstance.<br></p>
<table>
<thead>
<tr>
<th></th>
<th></th>
</tr>
</thead>
<tbody>
<tr>
<td>Alias</td>
<td></td>
</tr>
<tr>
<td>Required</td>
<td>False</td>
</tr>
<tr>
<td>Pipeline</td>
<td>false</td>
</tr>
<tr>
<td>Default Value</td>
<td></td>
</tr>
</tbody>
</table>
<h5 id="database">-Database</h5>
<p>The database(s) to process - this list is auto-populated from the server. If unspecified, all databases will be processed.<br></p>
<table>
<thead>
<tr>
<th></th>
<th></th>
</tr>
</thead>
<tbody>
<tr>
<td>Alias</td>
<td></td>
</tr>
<tr>
<td>Required</td>
<td>False</td>
</tr>
<tr>
<td>Pipeline</td>
<td>false</td>
</tr>
<tr>
<td>Default Value</td>
<td></td>
</tr>
</tbody>
</table>
<h5 id="excludedatabase">-ExcludeDatabase</h5>
<p>The database(s) to exclude - this list is auto-populated from the server<br></p>
<table>
<thead>
<tr>
<th></th>
<th></th>
</tr>
</thead>
<tbody>
<tr>
<td>Alias</td>
<td></td>
</tr>
<tr>
<td>Required</td>
<td>False</td>
</tr>
<tr>
<td>Pipeline</td>
<td>false</td>
</tr>
<tr>
<td>Default Value</td>
<td></td>
</tr>
</tbody>
</table>
<h5 id="aggregateby">-AggregateBy</h5>
<p>Specify the level of aggregation for the statistics. The available options are 'File' (the default), 'Database', and 'Disk'.<br></p>
<table>
<thead>
<tr>
<th></th>
<th></th>
</tr>
</thead>
<tbody>
<tr>
<td>Alias</td>
<td></td>
</tr>
<tr>
<td>Required</td>
<td>False</td>
</tr>
<tr>
<td>Pipeline</td>
<td>false</td>
</tr>
<tr>
<td>Default Value</td>
<td>File</td>
</tr>
<tr>
<td>Accepted Values</td>
<td>Database,Disk,File</td>
</tr>
</tbody>
</table>
<h5 id="enableexception">-EnableException</h5>
<p>By default, when something goes wrong we try to catch it, interpret it and give you a friendly warning message.<br />
This avoids overwhelming you with &quot;sea of red&quot; exceptions, but is inconvenient because it basically disables advanced scripting.<br />
Using this switch turns this &quot;nice by default&quot; feature off and enables you to catch exceptions with your own try/catch.<br></p>
<table>
<thead>
<tr>
<th></th>
<th></th>
</tr>
</thead>
<tbody>
<tr>
<td>Alias</td>
<td></td>
</tr>
<tr>
<td>Required</td>
<td>False</td>
</tr>
<tr>
<td>Pipeline</td>
<td>false</td>
</tr>
<tr>
<td>Default Value</td>
<td>False</td>
</tr>
</tbody>
</table>
<p> </p>

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