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<a class="WebWorks_Breadcrumb_Link" href="Trbleshoot.11.1.html#1247799">Troubleshooting</a> &gt; Error and Notification Messages</div>
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<div class="Heading3-CS"><a name="1143423">0004 Rebuild failed</a></div>
<div class="Heading4"><a name="1143568">Event Type</a></div>
<div class="BodyAfterHead"><a name="1143569">Error </a></div>
<div class="Heading4"><a name="1143570">Cause</a></div>
<div class="Body"><a name="1143424">The 3ware RAID controller was unable to complete a rebuild operation. This </a>error can be caused by drive errors on either the source or the destination of the rebuild. However, because ATA drives can reallocate sectors on write errors, the rebuild failure is most likely caused by the source drive of the rebuild detecting a read error.</div>
<div class="Heading4"><a name="1143574">Action</a></div>
<div class="Body"><a name="1143575">The default operation of the 3ware RAID controller is to abort a rebuild if an </a>error is encountered. If you want rebuilds to continue when there is a source error, you can set a unit policy to Continue on Source Error When Rebuilding in 3DM2 or CLI.</div>
<div class="Body"><a name="1199121">The consequence of continuing a rebuild when there is a source error is that </a>there may be corrupt data in your rebuilt unit. In some cases, however, this may be your only alternative for recovering as much data as possible from a unit that has become degraded.</div>
<div class="Body"><a name="1200002">To lower the likelihood of getting this error, schedule regular verifications.</a></div>
<div class="Heading4"><a name="1201348">See Also</a></div>
<div class="Body"><a href="Config_Units.6.12.html#1589821" name="1201352">Setting Overwrite ECC (Continue on Source Error When Rebuilding)</a>.</div>
<div class="Body"><a href="Maintain_Units.7.26.html#1112466" name="1201559">Scheduling Background Tasks</a></div>
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