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<a class="WebWorks_Breadcrumb_Link" href="Config_Units.6.1.html#2055333">Configuring Units</a> &gt; <a class="WebWorks_Breadcrumb_Link" href="Config_Units.6.8.html#2055333">Setting Unit Policies</a> &gt; Rapid RAID Recovery</div>
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<div class="Heading2"><a name="2055333">Rapid RAID Recovery</a></div>
<div class="BodyAfterHead"><a name="2059758">The Rapid Raid Recovery feature increases the speed with which a redundant </a>unit can be made redundant again when a rebuild is required. It can also increase the speed of verification or initialization that may occur in the event of an unclean shutdown.</div>
<div class="BodyAfterHead"><a name="2055347">Rapid RAID Recovery is possible because the firmware maps the unit, and </a>tracks the areas of the unit where write activity occurs. Then, if a rebuild, initialization, or verify is required, the controller only has to address the active areas. The fewer active areas, the faster the rebuild, initialize or verify.</div>
<div class="BodyAfterHead"><a name="2055342">Since the units are mapped out and tracked from the creation of the unit, this </a>feature can only be enabled during unit creation. Also, once disabled, it cannot be re-enabled.</div>
<div class="Body"><a name="2158815">The more space is available on a unit, the more benefit you will see in the </a>event of a rebuild, if you enable Rapid RAID Recovery. If all of a unit’s capacity is being used, you may not see reduction of rebuild speed when using Rapid RAID Recovery. However, Rapid RAID Recovery still provides benefits to unit verification and to initialization after an unclean shutdown, regardless of the disk usage. </div>
<div class="Body"><a name="2158817">Possible settings are </a><span class="UI-Element">All</span><span class="UI-Element"> </span>(labeled Fast Rebuild/Shutdown in 3BM)<span class="UI-Element">,</span> <span class="UI-Element">Rebuild</span> or <span class="UI-Element">Disable</span>. <span class="UI-Element">All</span> will apply the policy to both rebuilds and unclean shutdowns. <span class="UI-Element">Rebuild</span> will apply only to rebuilds. <span class="UI-Element">Disable</span> means that rebuilds, initializations and verifies will take place on the entire unit, not just the active sections. The default setting is <span class="UI-Element">All</span>.</div>
<div class="Body"><a name="2063003">There is some system overhead from setting rapid recovery to </a><span class="UI-Element">All</span><span class="Emphasis" style="font-weight: normal;">.</span> If you have a BBU, you can set rapid recovery to <span class="UI-Element">Rebuild</span><span class="Emphasis" style="font-weight: normal;">,</span> as a BBU provides protection against data loss in the event of an unclean shutdown.</div>
<div class="Body"><a name="2129223">Some limitations of Rapid RAID Recovery: </a></div>
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<div class="Bullet_inner"><a name="2063015">Units with Rapid RAID Recovery enabled will not be readable if moved </a>to controllers using pre-9.5.1 firmware. If you wish to move the unit to a controller with pre-9.5.1 firmware, you must first disable Rapid RAID Recovery.</div>
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<div class="Bullet_inner"><a name="2063016">Units created on controllers with pre-9.5.1 firmware will not be able to </a>take advantage of Rapid RAID Recovery when the controller is updated to 9.5.1 or later. These units will show Rapid RAID Recovery as disabled.</div>
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<div class="Bullet_inner"><a name="2216452">Since the Rapid RAID Recovery feature tracks areas of the unit where </a>write activity occurs, file systems such as FAT, FAT32, NTFS, and XFS are ideally suited to this implementation. For details on other file systems, search the LSI KnowledgeBase for keyword 15462 at<span class="link"> </span>:<span class="link"><a href="http://kb.lsi.com" target="_blank">http://kb.lsi.com</a></span>Protection against unclean shutdowns to provide a fast verification and initialization is the same regardless of the file system. </div>
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<div class="Heading3"><a name="2055429">Changing or disabling Rapid RAID Recovery</a></div>
<div class="BodyAfterHead"><a name="2055444">Rapid RAID Recovery can only be enabled (that is - set to All or Rebuild) </a>when the unit is created. You can change between All and Rebuild at any time. However, if you disable Rapid RAID Recovery, you cannot then enable it.</div>
<div class="ToDo"><a name="2055732">To change or disable </a>Rapid RAID Recovery for an existing unit through 3DM2</div>
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<span class="UI-Element">1 </span>
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<div class="NumberedFirst_inner"><a name="2055733">Choose </a><span class="UI-Element">Management &gt;&gt; Controller Settings</span> from the menu bar in 3DM2.</div>
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<span class="UI-Element">2 </span>
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<div class="Numbered_inner"><a name="2055955">In the </a><span class="UI-Element">Unit Policies </span>section of the <a href="Controller_Settings.html#1088416">Controller Settings page</a>, select <span class="UI-Element">All</span>, <span class="UI-Element">Rebuild,</span> or <span class="UI-Element">Disable</span> from the Rapid RAID Recovery dropdown menu.</div>
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<div class="Numbered_inner"><a name="2056000">Click OK when 3DM2 asks you to confirm your selection.</a></div>
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<div class="Indent"><a name="2055956">The page refreshes, and a message at the top confirms the change that you </a>have made.</div>
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<dl>
<dt>Related Topics</dt>
<dd>
<div class="RelatedTopic"><a href="Config_Units.6.9.html#1113091" name="2407503">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="2407507">Working with Read Cache Settings</a></div>
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<div class="RelatedTopic"><a href="Config_Units.6.11.html#2185080" name="2407511">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="2407515">Setting Overwrite ECC (Continue on Source Error When Rebuilding)</a></div>
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<div class="RelatedTopic"><a href="Config_Units.6.13.html#1173071" name="2407519">Enabling and Disabling Queuing for a Unit</a></div>
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<div class="RelatedTopic"><a href="Config_Units.6.14.html#1113125" name="2407523">Setting the StorSave Profile for a Unit</a></div>
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