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<a class="WebWorks_Breadcrumb_Link" href="Config_Controller.5.1.html#1091097">Configuring Your Controller</a> > Using Auto-Carving for Multi LUN Support</div>
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<hr align="left" />
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<div>
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<div class="Heading1"><a name="1091097">Using Auto-C</a>arving for Multi LUN Support</div>
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<div class="BodyAfterHead"><a name="1294746">Auto-carving is useful for creating multiple volumes out of large arrays at the </a>hardware level. Then, when you boot to the operating system, each volume appears as a different disk drive, simplifying the partitioning required at the operating system level.</div>
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<div class="Body"><a name="1347558">When the Auto-Carving policy is on, any new unit larger than a specified size </a>(known as the <span class="Emphasis">carve size</span>) will be created as multiple volumes that can be addressed by the operating system as separate volumes. These chunks are sometimes known as multiple LUNs (logical units). However, throughout the 3ware documentation, they are referred to as <span class="Emphasis">volumes</span>. </div>
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<div class="Body"><a name="1091773">For example, using the default carve size of 2</a> TB, if the unit is 2.5 TB then it will contain two volumes, with the first volume containing 2 TB and the second volume containing 0.5 TB. If the unit is 5.0 TB then it will contain 3 volumes, with the first two volumes containing 2 TB each and the last volume containing 1 TB. (<span class="NoteHeading">Note:</span> If a specific Boot Volume was also specified in 3BM or CLI, the first volume will be the size specified for the Boot Volume, and then the carve size will be applied to the remainder of the unit. For more information, see <a href="Config_Units.6.3.html#2151037">Boot volume size</a>.)</div>
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<div class="Body"><a name="1082394">Each volume can be treated as an individual disk with its own file system. The </a>default carve size is 2 TB; you can change this to a setting in the range of 1 TB to 32 TB (1024 GB to 32768 GB). 3ware firmware supports a maximum of 32 volumes per controller, up to a total of 32 TB.</div>
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<div class="anchor">
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<span class="Red"> </span><a name="1294803"> </a></div>
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<table id="1294808" class="NoteTable" style="margin-bottom: pt; margin-right: pt; margin-top: pt; padding-bottom: pt; padding-left: pt; padding-right: pt; padding-top: pt; text-align: left;" cellspacing="0">
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<caption></caption>
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<tr style="vertical-align: top;">
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<td id="tc1294810" style="background-color: Transparent; border-bottom-color: White; border-bottom-style: solid; border-bottom-width: thin; border-left-color: White; border-left-style: solid; border-left-width: thin; border-right-color: White; border-right-style: solid; border-right-width: thin; border-top-color: White; border-top-style: solid; border-top-width: thin; padding-bottom: pt; padding-left: pt; padding-right: pt; padding-top: pt; vertical-align: top;">
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<div class="NoteAnchor">
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<img src="Note.gif" alt="*" id="bullet1294810" border="0" width="27" height="34" /><a name="1294810"> </a></div>
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</td>
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<td id="tc1294878" style="background-color: Transparent; border-bottom-color: White; border-bottom-style: solid; border-bottom-width: thin; border-left-color: White; border-left-style: solid; border-left-width: thin; border-right-color: White; border-right-style: solid; border-right-width: thin; border-top-color: White; border-top-style: solid; border-top-width: thin; padding-bottom: pt; padding-left: pt; padding-right: pt; padding-top: pt; vertical-align: top;">
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<div class="CellBody"><span class="NoteHeading"><a name="1294878">Note:</a></span> CLI provides the ability to specify variable sizes for the first 4 volumes of a unit when auto-carving. This is done while creating a unit with the <span class="code-char">/c</span><span class="Emphasis">x</span><span class="code-char"> add type</span> command attribute <span class="code-char">[v0=n|vol=a:b:c:d</span>]. See the <span class="Emphasis">3ware SATA+SAS RAID </span><span class="Emphasis">Controller Card CLI Guide, Version 10.2.</span></div>
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<div class="Body"><a name="1082055">If you are migrating a unit to a size that is larger than the carve size and auto-</a>carving is on, multiple volumes will be created.</div>
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<div class="anchor">
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<span class="Red"> </span><a name="1090574"> </a></div>
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<table id="1090578" class="NoteTable" style="margin-bottom: pt; margin-right: pt; margin-top: pt; padding-bottom: pt; padding-left: pt; padding-right: pt; padding-top: pt; text-align: left;" cellspacing="0">
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<caption></caption>
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<tr style="vertical-align: top;">
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<td id="tc1090580" style="background-color: Transparent; border-bottom-color: White; border-bottom-style: solid; border-bottom-width: thin; border-left-color: White; border-left-style: solid; border-left-width: thin; border-right-color: White; border-right-style: solid; border-right-width: thin; border-top-color: White; border-top-style: solid; border-top-width: thin; padding-bottom: pt; padding-left: pt; padding-right: pt; padding-top: pt; vertical-align: top;">
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<div class="NoteAnchor">
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<img src="Note.gif" alt="*" id="bullet1090580" border="0" width="27" height="34" /><a name="1090580"> </a></div>
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</td>
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<td id="tc1293111" style="background-color: Transparent; border-bottom-color: White; border-bottom-style: solid; border-bottom-width: thin; border-left-color: White; border-left-style: solid; border-left-width: thin; border-right-color: White; border-right-style: solid; border-right-width: thin; border-top-color: White; border-top-style: solid; border-top-width: thin; padding-bottom: pt; padding-left: pt; padding-right: pt; padding-top: pt; vertical-align: top;">
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<div class="CellBody"><span class="NoteHeading"><a name="1090582">Note:</a></span> Carving a unit into multiple volumes can have an impact on performance.</div>
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<div class="CellBody" style="color: #000000; font-style: normal; font-variant: normal; font-weight: bold; text-transform: none; vertical-align: baseline;"><a name="1293111"> </a></div>
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</td>
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</table>
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<div class="anchor">
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<span class="Red"> </span><a name="1320541"> </a></div>
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<table id="1320535" class="NoteTable" style="margin-bottom: pt; margin-right: pt; margin-top: pt; padding-bottom: pt; padding-left: pt; padding-right: pt; padding-top: pt; text-align: left;" cellspacing="0">
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<caption></caption>
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<tr style="vertical-align: top;">
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<td id="tc1320537" style="background-color: Transparent; border-bottom-color: White; border-bottom-style: solid; border-bottom-width: thin; border-left-color: White; border-left-style: solid; border-left-width: thin; border-right-color: White; border-right-style: solid; border-right-width: thin; border-top-color: White; border-top-style: solid; border-top-width: thin; padding-bottom: pt; padding-left: pt; padding-right: pt; padding-top: pt; vertical-align: top;">
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<div class="NoteAnchor">
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<img src="Note.gif" alt="*" id="bullet1320537" border="0" width="27" height="34" /><a name="1320537"> </a></div>
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</td>
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<td id="tc1320539" style="background-color: Transparent; border-bottom-color: White; border-bottom-style: solid; border-bottom-width: thin; border-left-color: White; border-left-style: solid; border-left-width: thin; border-right-color: White; border-right-style: solid; border-right-width: thin; border-top-color: White; border-top-style: solid; border-top-width: thin; padding-bottom: pt; padding-left: pt; padding-right: pt; padding-top: pt; vertical-align: top;">
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<div class="CellBody"><span class="NoteHeading"><a name="1320539">Note:</a></span> Even though the Linux 2.6 kernel supports partitions larger than 2 TB, the installers for SUSE and Redhat do not. Turn auto-carving on to prevent the installation from failing.</div>
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</table>
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<div class="Body"><a name="1082066">You must turn on the Auto-Carving policy before creating the unit. Units </a>created with this policy turned off will not be affected by a change to the policy. If the policy is turned off later, units that have been carved into volumes will retain their individual volumes; existing data is not affected. </div>
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<div class="ToDo"><a name="1082067">To use auto-carving </a></div>
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<div class="NumberedFirst_outer" style="margin-left: NaN;">
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<table border="0" cellspacing="0" cellpadding="0" id="SummaryNotRequired_np1082068">
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<tr style="vertical-align: baseline;">
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<div class="NumberedFirst_inner" style="width: 1.5em; white-space: nowrap;">
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<span class="UI-Element">1 </span>
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</div>
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<div class="NumberedFirst_inner"><a name="1082068">Enable the auto-carving feature. </a></div>
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</div>
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<div class="Indent"><a name="1082069">In 3DM2, enable Auto-Carving at the bottom of the </a><span class="UI-Element">Management >> </span><span class="UI-Element">Controller Settings</span> page. </div>
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<div class="Numbered_outer" style="margin-left: NaN;">
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<table border="0" cellspacing="0" cellpadding="0" id="SummaryNotRequired_np1082080">
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<div class="Numbered_inner" style="width: 1.5em; white-space: nowrap;">
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<span class="UI-Element">2 </span>
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</div>
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<td width="100%">
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<div class="Numbered_inner"><a name="1082080">Create a new unit or migrate an existing unit to include the drives you </a>want to use.</div>
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</td>
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</div>
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<div class="Indent"><a name="1092257">If the combined capacity of the drives exceeds the carve size, a number of </a>volumes will be created. </div>
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<div class="Numbered_outer" style="margin-left: NaN;">
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<table border="0" cellspacing="0" cellpadding="0" id="SummaryNotRequired_np1082083">
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<tr style="vertical-align: baseline;">
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<td>
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<div class="Numbered_inner" style="width: 1.5em; white-space: nowrap;">
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<span class="UI-Element">3 </span>
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</div>
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</td>
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<td width="100%">
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<div class="Numbered_inner"><a name="1082083">Verify the creation of the volumes.</a></div>
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</td>
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</tr>
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</table>
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</div>
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<div class="Indent"><a name="1082084">In 3DM2, the number of volumes is shown on the Unit Details page. </a></div>
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<div class="Numbered_outer" style="margin-left: NaN;">
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<table border="0" cellspacing="0" cellpadding="0" id="SummaryNotRequired_np1115221">
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<tr style="vertical-align: baseline;">
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<div class="Numbered_inner" style="width: 1.5em; white-space: nowrap;">
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<span class="UI-Element">4 </span>
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</div>
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<td width="100%">
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<div class="Numbered_inner"><a name="1115221">Verify that the volumes appear in the operating system. They will appear </a>as additional drives. </div>
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</td>
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</tr>
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</table>
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</div>
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<div class="anchor">
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<span class="Red"> </span><a name="1115231"> </a></div>
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<table id="1115222" class="NoteTable" style="margin-bottom: pt; margin-right: pt; margin-top: pt; padding-bottom: pt; padding-left: pt; padding-right: pt; padding-top: pt; text-align: left;" cellspacing="0">
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<caption></caption>
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<td id="tc1115224" style="background-color: Transparent; border-bottom-color: White; border-bottom-style: solid; border-bottom-width: thin; border-left-color: White; border-left-style: solid; border-left-width: thin; border-right-color: White; border-right-style: solid; border-right-width: thin; border-top-color: White; border-top-style: solid; border-top-width: thin; padding-bottom: pt; padding-left: pt; padding-right: pt; padding-top: pt; vertical-align: top;">
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<div class="NoteAnchor">
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<img src="Note.gif" alt="*" id="bullet1115224" border="0" width="27" height="34" /><a name="1115224"> </a></div>
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</td>
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<td id="tc1115230" style="background-color: Transparent; border-bottom-color: White; border-bottom-style: solid; border-bottom-width: thin; border-left-color: White; border-left-style: solid; border-left-width: thin; border-right-color: White; border-right-style: solid; border-right-width: thin; border-top-color: White; border-top-style: solid; border-top-width: thin; padding-bottom: pt; padding-left: pt; padding-right: pt; padding-top: pt; vertical-align: top;">
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<div class="CellBody"><span class="NoteHeading"><a name="1115226">Notes:</a></span> </div>
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<div class="CellBullet_outer" style="margin-left: 0pt;">
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<span class="DingBats">• </span>
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<td width="100%">
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<div class="CellBullet_inner"><a name="1321122">If you are configuring a unit for primary storage and it will be greater than 2 TB, </a>be sure to enable the auto-carve policy before creating the unit.</div>
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<span class="DingBats">• </span>
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<div class="CellBullet_inner"><a name="1115228">When volumes have been created through auto-carving, they cannot be </a>deleted except by deleting the unit.</div>
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<div class="CellBullet_inner"><a name="1321127">If you create a bootable unit that has multiple volumes, the first volume can be </a>used as the boot device.</div>
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<div class="CellBullet_inner"><a name="1115230">Changing the auto-carve policy does not affect existing units.</a></div>
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</div>
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</td>
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<hr />
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<dl>
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<dt>Related Topics</dt>
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<dd>
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<div class="RelatedTopic"><a href="Config_Controller.5.4.html#1135243" name="1373416">Viewing Controller Policies</a></div>
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</dd>
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<dd>
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<div class="RelatedTopic"><a href="Config_Controller.5.5.html#1115045" name="1373420">Setting the Auto-Rebuild Policy</a></div>
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</dd>
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<dd>
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<div class="RelatedTopic"><a href="Config_Controller.5.7.html#1115233" name="1373424">Setting the Size of Volumes Created with Auto-Carving</a></div>
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</dd>
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<dd>
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<div class="RelatedTopic"><a href="Config_Controller.5.8.html#1320680" name="1373750">Enabling and Setting Up Staggered Spin-up</a></div>
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<div class="RelatedTopic"><a href="Config_Controller.5.9.html#1258742" name="1373758">Viewing Information About a Phy</a></div>
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<div class="RelatedTopic"><a href="Config_Controller.5.10.html#1262395" name="1373762">Changing the Phy Link Speed</a></div>
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