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<a class="WebWorks_Breadcrumb_Link" href="Maintain_Units.7.1.html#1353024">Maintaining Units</a> > <a class="WebWorks_Breadcrumb_Link" href="Maintain_Units.7.15.html#1353024">Background Tasks</a> > Rebuilding Units</div>
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<hr align="left" />
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<div>
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<div class="Heading2"><a name="1353024">Rebuilding Units</a></div>
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<div class="Body"><a name="1353070">Rebuilding is the process of generating data on a new drive after it is put into </a>service to replace a failed drive in a fault tolerant unit.</div>
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<div class="Body"><a name="1177166">If a hot spare of the appropriate drive type (SAS or SATA) is specified and a </a>redundant unit degrades, it will be used to automatically replace the failed drive in the redundant unit without intervention on your part. The rebuild process will automatically be launched as a background process at the next scheduled time. If scheduling is turned off, the rebuild process will start almost immediately (within a couple of minutes). If 3DM2 is running and E-mail notification is enabled, an event notification will be sent to specified users when the unit degrades and again when the rebuild process is complete.</div>
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<div class="Body"><a name="1177171">If the Auto-Rebuild policy is enabled (see </a><a href="Config_Controller.5.5.html#1115045">Setting the Auto-Rebuild Policy</a>), the firmware will attempt to rebuild a degraded unit with an available drive or a failed drive.</div>
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<div class="Body"><a name="1573245">If desired, you can manually replace the drive, rescan the controller, and start </a>the rebuild process. Manual rebuilds can be started from either 3BM, CLI, or 3DM2, although the rebuild itself only happens when the operating system is running. </div>
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<div class="Body"><a name="1515071">The rebuild process may take less time if Rapid RAID Recovery has been </a>enabled during unit creation. See <a href="Config_Units.6.15.html#2055333">Rapid RAID Recovery</a>.</div>
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<div class="Body"><a name="1515069">Rebuilds on multiple units can take place simultaneously.</a></div>
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<div class="Body"><a name="1177174">If multiple drives are faulted in a RAID 10 configuration, the drives are </a>rebuilt simultaneously. In a 4-drive RAID 10 configuration, up to two drives can be rebuilt. In a 6-drive configuration, up to three drives can be rebuilt. In an 8-drive configuration, up to four drives can be rebuilt. In a 12-drive configuration, up to six drives can be rebuilt.</div>
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<div class="anchor">
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<span class="Red"> </span><a name="1177180"> </a></div>
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<table id="1177175" 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="tc1177177" 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="bullet1177177" border="0" width="27" height="34" /><a name="1177177"> </a></div>
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</td>
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<td id="tc1177179" 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="1177179">Note</a></span>: If both drives in a RAID 10 mirrored set are faulted, the data is not recoverable. Up to half of the drives in a RAID 10 unit can become defective and still have the user data retained, as long as the failed drives are only half of each mirrored pair.</div>
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</td>
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</table>
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<div class="Body"><a name="1432155">A RAID 5 unit can have one drive fail before becoming inoperable.</a></div>
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<div class="Body"><a name="1432156">A RAID 50 unit can sustain multiple drive failures, as long there is only one </a>failed drive in each RAID 5 set.</div>
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<div class="Body"><a name="1432157">A RAID 6 unit can have two simultaneous drive failures, before becoming </a>inoperable.</div>
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<div class="Body"><a name="1432158">When a redundant RAID unit is running in Degraded mode and you rebuild it, </a>the missing data is reconstructed from all functioning drives. </div>
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<div class="anchor">
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<span class="Red"> </span><a name="1177188"> </a></div>
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<table id="1177183" 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="tc1177185" 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="bullet1177185" border="0" width="27" height="34" /><a name="1177185"> </a></div>
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</td>
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<td id="tc1640786" 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="1177187">Note:</a></span> If a rebuild fails, check the Alarms page for the reason. If there was an ECC error on the source disk, you can force the rebuild to continue by checking the Overwrite ECC policy on the Controller Settings page in 3DM2 and then running Rebuild again. This will cause uncorrectable blocks to be rewritten and the data may be incorrect. It is recommended that you execute a file system check when the rebuild completes. </div>
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<div class="CellBullet_outer" style="margin-left: 0pt;">
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<table border="0" cellspacing="0" cellpadding="0" id="SummaryNotRequired_np1650162">
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<div class="CellBullet_inner" style="width: 18pt; white-space: nowrap;">
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<span class="DingBats">• </span>
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</div>
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</td>
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<td width="100%">
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<div class="CellBullet_inner"><a name="1650162">Under Windows, you can do this by right-clicking on the Drive and choosing </a><span class="UI-Element">Properties</span>; then on the <span class="UI-Element">Tools</span> tab, click <span class="UI-Element">Check Now</span>. </div>
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</div>
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<div class="CellBullet_outer" style="margin-left: 0pt;">
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<table border="0" cellspacing="0" cellpadding="0" id="SummaryNotRequired_np1650178">
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<td>
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<div class="CellBullet_inner" style="width: 18pt; white-space: nowrap;">
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<span class="DingBats">• </span>
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</div>
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</td>
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<td width="100%">
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<div class="CellBullet_inner"><a name="1650178">Under Linux</a> or FreeBSD use <span class="code-char">fsck</span></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="CellBullet_outer" style="margin-left: 0pt;">
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<table border="0" cellspacing="0" cellpadding="0" id="SummaryNotRequired_np1622796">
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<tr style="vertical-align: baseline;">
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<td>
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<div class="CellBullet_inner" style="width: 18pt; white-space: nowrap;">
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<span class="DingBats">• </span>
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</div>
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</td>
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<td width="100%">
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<div class="CellBullet_inner"><a name="1622796">On Mac OS X, you can do this using the First Aid tab in the Disk Utility</a>—select the disk on the left and then click <span class="UI-Element-in-Table">Verify Disk</span>. If verification encounters problems, you can then use the <span class="UI-Element-in-Table">Repair Disk</span> option on the same screen.</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="CellBullet_outer" style="margin-left: 0pt;">
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<table border="0" cellspacing="0" cellpadding="0" id="SummaryNotRequired_np1640786">
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<tr style="vertical-align: baseline;">
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<td>
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<div class="CellBullet_inner" style="width: 18pt; white-space: nowrap;">
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<span class="DingBats">• </span>
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</div>
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</td>
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<td width="100%">
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<div class="CellBullet_inner"><a name="1640786">For OpenSolaris and VMware you should follow your operating system’s guide </a>to perform a file system check.</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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</td>
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</tr>
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</table>
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<div class="ToDo"><a name="1177194">To rebuild a </a>unit through 3DM2</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_np1177195">
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<tr style="vertical-align: baseline;">
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<td>
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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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</td>
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<td width="100%">
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<div class="NumberedFirst_inner"><a name="1177195">If necessary, add a new drive to replace the failed drive. (For details, see </a><a href="Config_Units.6.24.html#2070053">Adding a Drive</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="Numbered_outer" style="margin-left: NaN;">
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<table border="0" cellspacing="0" cellpadding="0" id="SummaryNotRequired_np1177199">
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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">2 </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="1177199">In 3DM2, choose </a><span class="UI-Element">Management >> Maintenance</span>.</div>
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</td>
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</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_np1177203">
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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="1177203">In the </a><span class="UI-Element">Unit Maintenance</span> section of the <a href="Maintenance.html#1665709">Maintenance page</a>, select the degraded unit and click the <span class="UI-Element">Rebuild Unit</span> button.</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="Numbered_outer" style="margin-left: NaN;">
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<table border="0" cellspacing="0" cellpadding="0" id="SummaryNotRequired_np1194804">
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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">4 </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="1194804">When a dialog box displays available drives, select the drive you want to </a>replace the failed drive and click <span class="UI-Element">OK</span><span style="font-weight: bold;">. </span></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="FigureIndent" onclick="WebWorks_ToggleDIV(WebWorksRootPath, "wwdd1194805");"><a name="1194805">Show </a>Selecting a Drive when Rebuilding<script type="text/javascript" language="JavaScript1.2">WebWorks_WriteArrow(WebWorksRootPath, "wwdd1194805", false);</script></div>
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<script type="text/javascript" language="JavaScript1.2">WebWorks_WriteDIVOpen("wwdd1194805", false);</script>
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<div class="anchor-indented"><a name="1194809"><img id="1194807" class="Default" src="images/select-drive-during-rebuild-3dm.gif" width="657" height="176" style="display: inline; float: none; left: 0.0; text-align: left; top: 0.0;" /></a></div>
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<script type="text/javascript" language="JavaScript1.2">WebWorks_WriteDIVClose();</script>
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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_np1177209">
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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">5 </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="1177209">If the degraded unit has more than one failed drive (for example, a RAID </a>10 where both mirrored pairs each have a failed drive), repeat step 3 and step 4 to select another drive.</div>
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</td>
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</table>
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</div>
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<div class="Indent"><a name="1177210">If rebuild scheduling is not enabled on the </a><span class="UI-Element">Scheduling</span> page, the rebuild process begins almost immediately in the background. If rebuild scheduling is enabled, the unit will not start actively rebuilding until the next scheduled time. </div>
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<div class="anchor">
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<span class="Red"> </span><a name="1377895"> </a></div>
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<table id="1377890" 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="tc1377892" 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="bullet1377892" border="0" width="27" height="34" /><a name="1377892"> </a></div>
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</td>
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<td id="tc1377894" 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="1377894">Note:</a></span> If you need to cancel a rebuild, you can do so by using the <span class="UI-Element-in-Table">Remove Drive</span> link on the Maintenance page to remove the drive from the unit.</div>
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</td>
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</tr>
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</table>
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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="Maintain_Units.7.21.html#1377899" name="1675457">Cancelling a Rebuild and Restarting It with a Different Drive</a></div>
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