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      <a class="WebWorks_Breadcrumb_Link" href="Config_Units.6.1.html#1173071">Configuring Units</a> &gt; <a class="WebWorks_Breadcrumb_Link" href="Config_Units.6.8.html#1173071">Setting Unit Policies</a> &gt; Enabling and Disabling Queuing for a Unit</div>
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      <div class="Heading2"><a name="1173071">Enabling and Disabling Queuing for a Unit</a></div>
      <div class="BodyAfterHead"><a name="1236926">Some drives support command queuing, a feature that can result in increased </a>performance for applications that require a lot of random access of data (usually server-type applications). This is accomplished by causing command reordering to be done on the drive.</div>
      <div class="Body"><a name="1173074">In order to make use of command queuing, the feature must be enabled at both </a>the drive and the controller. You can enable support for command queuing on a per-unit basis, as described below.</div>
      <div class="Body"><a name="1173075">You can see whether command queuing is supported and enabled for a </a>particular drive in the Drive Details window. For details, see <a href="Drive_Details.html#1039080">Drive Details window</a>. </div>
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        <span class="Red">                                      </span><a name="1199891">&nbsp;</a></div>
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            <div class="CellBody"><span class="NoteHeading"><a name="1199899">Note:</a></span> Not all drives support command queuing. If a drive does not support command queuing, the policy setting for the controller is ignored. Queuing information for SAS is not available.</div>
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      <div class="ToDo"><a name="1173083">To enable or disable queuing for a unit through 3DM2</a></div>
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              <div class="NumberedFirst_inner"><a name="1173084">Choose </a><span class="UI-Element">Management &gt;&gt; Controller Settings</span> from the menu bar in 3DM2.</div>
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              <div class="Numbered_inner"><a name="1173088">In the </a><span class="UI-Element">Unit Policies </span>section of the <a href="Controller_Settings.html#1088416">Controller Settings page</a>, enable queuing by checking the box under “Queuing” for the designated unit; disable it by unchecking the box.</div>
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      <div class="Indent"><a name="1173089">The page refreshes, and a message at the top confirms the change that you </a>have made.</div>
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      <dl>
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          <div class="RelatedTopic"><a href="Config_Units.6.9.html#1113091" name="2407435">Enabling and Disabling the Unit Write Cache</a></div>
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          <div class="RelatedTopic"><a href="Config_Units.6.10.html#2185087" name="2407439">Working with Read Cache Settings</a></div>
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        <dd>
          <div class="RelatedTopic"><a href="Config_Units.6.11.html#2185080" name="2407443">Enabling or Disabling Auto-Verify for a Unit</a></div>
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          <div class="RelatedTopic"><a href="Config_Units.6.12.html#1589821" name="2407447">Setting Overwrite ECC (Continue on Source Error When Rebuilding)</a></div>
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          <div class="RelatedTopic"><a href="Config_Units.6.14.html#1113125" name="2407451">Setting the StorSave Profile for a Unit</a></div>
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          <div class="RelatedTopic"><a href="Config_Units.6.15.html#2055333" name="2407455">Rapid RAID Recovery</a></div>
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