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<a class="WebWorks_Breadcrumb_Link" href="3ware_Intro.2.5.html#1584955">Understanding RAID Concepts and Levels</a> &gt; RAID Concepts &gt; Determining Which RAID Level to Use</div>
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<div class="Heading2"><a name="1584955">Determining Which RAID Level to Use</a></div>
<div class="Body"><a name="1584956">The type of RAID unit (array) that you create depends on your needs. You </a>might want to maximize speed of access, total amount of storage, or redundant protection of data. Each type of RAID unit offers a different blend of these characteristics.</div>
<div class="Body"><a name="1584957">The following table summarizes RAID configuration types. </a></div>
<div class="anchor">
<span class="Red"> </span><a name="1584996">&nbsp;</a></div>
<table id="1584958" class="Two-column" style="margin-bottom: pt; margin-right: pt; padding-left: pt; padding-right: pt; text-align: left;" cellspacing="0">
<caption>
<div class="TableTitle"><a name="1584960">RAID Configuration Types</a></div>
</caption>
<tr style="vertical-align: top;">
<td id="tc1584964" style="background-color: LightSteelBlue; border-bottom-color: Black; border-bottom-style: solid; border-bottom-width: thin; border-left-color: #E0E0E0; border-left-style: none; border-left-width: thin; border-right-color: #E0E0E0; border-right-style: none; border-right-width: thin; border-top-color: Black; border-top-style: solid; border-top-width: thin; padding-bottom: 0.25em; padding-left: pt; padding-right: pt; padding-top: 0.25em; vertical-align: top; width: 72pt;">
<div class="CellHeading"><a name="1584964">RAID Type</a></div>
</td>
<td id="tc1584966" style="background-color: LightSteelBlue; border-bottom-color: Black; border-bottom-style: solid; border-bottom-width: thin; border-left-color: #E0E0E0; border-left-style: none; border-left-width: thin; border-right-color: #E0E0E0; border-right-style: none; border-right-width: thin; border-top-color: Black; border-top-style: solid; border-top-width: thin; padding-bottom: 0.25em; padding-left: pt; padding-right: pt; padding-top: 0.25em; vertical-align: top; width: 268.62624pt;">
<div class="CellHeading"><a name="1584966">Description</a></div>
</td>
</tr>
<tr style="vertical-align: top;">
<td id="tc1584968" style="border-bottom-color: Silver; border-bottom-style: none; border-bottom-width: thin; border-left-color: Silver; border-left-style: none; border-left-width: thin; border-right-color: Silver; border-right-style: none; border-right-width: thin; border-top-color: Silver; border-top-style: none; border-top-width: thin; padding-bottom: 0.25em; padding-left: pt; padding-right: pt; padding-top: 0.25em; vertical-align: top;">
<div class="CellBody"><a name="1584968">RAID 0</a></div>
</td>
<td id="tc1584970" style="border-bottom-color: Silver; border-bottom-style: none; border-bottom-width: thin; border-left-color: Silver; border-left-style: none; border-left-width: thin; border-right-color: Silver; border-right-style: none; border-right-width: thin; border-top-color: Silver; border-top-style: none; border-top-width: thin; padding-bottom: 0.25em; padding-left: pt; padding-right: pt; padding-top: 0.25em; vertical-align: top;">
<div class="CellBody"><a name="1584970">Provides performance, but no fault tolerance.</a></div>
</td>
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<td id="tc1584972" style="background-color: WhiteSmoke; border-bottom-color: Silver; border-bottom-style: none; border-bottom-width: thin; border-left-color: Silver; border-left-style: none; border-left-width: thin; border-right-color: Silver; border-right-style: none; border-right-width: thin; border-top-color: Silver; border-top-style: none; border-top-width: thin; padding-bottom: 0.25em; padding-left: pt; padding-right: pt; padding-top: 0.25em; vertical-align: top;">
<div class="CellBody"><a name="1584972">RAID 1</a></div>
</td>
<td id="tc1584974" style="background-color: WhiteSmoke; border-bottom-color: Silver; border-bottom-style: none; border-bottom-width: thin; border-left-color: Silver; border-left-style: none; border-left-width: thin; border-right-color: Silver; border-right-style: none; border-right-width: thin; border-top-color: Silver; border-top-style: none; border-top-width: thin; padding-bottom: 0.25em; padding-left: pt; padding-right: pt; padding-top: 0.25em; vertical-align: top;">
<div class="CellBody"><a name="1584974">Provides fault tolerance and a read speed advantage over non-</a>RAID disks.</div>
</td>
</tr>
<tr style="vertical-align: top;">
<td id="tc1584976" style="border-bottom-color: Silver; border-bottom-style: none; border-bottom-width: thin; border-left-color: Silver; border-left-style: none; border-left-width: thin; border-right-color: Silver; border-right-style: none; border-right-width: thin; border-top-color: Silver; border-top-style: none; border-top-width: thin; padding-bottom: 0.25em; padding-left: pt; padding-right: pt; padding-top: 0.25em; vertical-align: top;">
<div class="CellBody"><a name="1584976">RAID 5</a></div>
</td>
<td id="tc1584978" style="border-bottom-color: Silver; border-bottom-style: none; border-bottom-width: thin; border-left-color: Silver; border-left-style: none; border-left-width: thin; border-right-color: Silver; border-right-style: none; border-right-width: thin; border-top-color: Silver; border-top-style: none; border-top-width: thin; padding-bottom: 0.25em; padding-left: pt; padding-right: pt; padding-top: 0.25em; vertical-align: top;">
<div class="CellBody"><a name="1584978">Provides performance, fault tolerance, and high storage </a>efficiency. RAID 5 units can tolerate one drive failing before losing data.</div>
</td>
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<td id="tc1584980" style="background-color: WhiteSmoke; border-bottom-color: Silver; border-bottom-style: none; border-bottom-width: thin; border-left-color: Silver; border-left-style: none; border-left-width: thin; border-right-color: Silver; border-right-style: none; border-right-width: thin; border-top-color: Silver; border-top-style: none; border-top-width: thin; padding-bottom: 0.25em; padding-left: pt; padding-right: pt; padding-top: 0.25em; vertical-align: top;">
<div class="CellBody"><a name="1584980">RAID 6</a></div>
</td>
<td id="tc1584982" style="background-color: WhiteSmoke; border-bottom-color: Silver; border-bottom-style: none; border-bottom-width: thin; border-left-color: Silver; border-left-style: none; border-left-width: thin; border-right-color: Silver; border-right-style: none; border-right-width: thin; border-top-color: Silver; border-top-style: none; border-top-width: thin; padding-bottom: 0.25em; padding-left: pt; padding-right: pt; padding-top: 0.25em; vertical-align: top;">
<div class="CellBody"><a name="1584982">Provides very high fault tolerance with the ability to protect </a>against two consecutive drive failures. Performance and efficiency increase with higher numbers of drives. </div>
</td>
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<tr style="vertical-align: top;">
<td id="tc1584984" style="border-bottom-color: Silver; border-bottom-style: none; border-bottom-width: thin; border-left-color: Silver; border-left-style: none; border-left-width: thin; border-right-color: Silver; border-right-style: none; border-right-width: thin; border-top-color: Silver; border-top-style: none; border-top-width: thin; padding-bottom: 0.25em; padding-left: pt; padding-right: pt; padding-top: 0.25em; vertical-align: top;">
<div class="CellBody"><a name="1584984">RAID 10</a></div>
</td>
<td id="tc1584986" style="border-bottom-color: Silver; border-bottom-style: none; border-bottom-width: thin; border-left-color: Silver; border-left-style: none; border-left-width: thin; border-right-color: Silver; border-right-style: none; border-right-width: thin; border-top-color: Silver; border-top-style: none; border-top-width: thin; padding-bottom: 0.25em; padding-left: pt; padding-right: pt; padding-top: 0.25em; vertical-align: top;">
<div class="CellBody"><a name="1584986">Provides a combination of striped and mirrored units for fault </a>tolerance and high performance.</div>
</td>
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<tr style="vertical-align: top;">
<td id="tc1584988" style="background-color: WhiteSmoke; border-bottom-color: Silver; border-bottom-style: none; border-bottom-width: thin; border-left-color: Silver; border-left-style: none; border-left-width: thin; border-right-color: Silver; border-right-style: none; border-right-width: thin; border-top-color: Silver; border-top-style: none; border-top-width: thin; padding-bottom: 0.25em; padding-left: pt; padding-right: pt; padding-top: 0.25em; vertical-align: top;">
<div class="CellBody"><a name="1584988">RAID 50</a></div>
</td>
<td id="tc1584990" style="background-color: WhiteSmoke; border-bottom-color: Silver; border-bottom-style: none; border-bottom-width: thin; border-left-color: Silver; border-left-style: none; border-left-width: thin; border-right-color: Silver; border-right-style: none; border-right-width: thin; border-top-color: Silver; border-top-style: none; border-top-width: thin; padding-bottom: 0.25em; padding-left: pt; padding-right: pt; padding-top: 0.25em; vertical-align: top;">
<div class="CellBody"><a name="1584990">Provides a combination of RAID 5 and RAID 0. RAID 50 provides </a>high fault tolerance and performance.</div>
</td>
</tr>
<tr style="vertical-align: top;">
<td id="tc1584992" style="border-bottom-color: Silver; border-bottom-style: none; border-bottom-width: thin; border-left-color: Silver; border-left-style: none; border-left-width: thin; border-right-color: Silver; border-right-style: none; border-right-width: thin; border-top-color: Silver; border-top-style: none; border-top-width: thin; padding-bottom: 0.25em; padding-left: pt; padding-right: pt; padding-top: 0.25em; vertical-align: top;">
<div class="CellBody"><a name="1584992">Single Disk</a></div>
</td>
<td id="tc1584995" style="border-bottom-color: Silver; border-bottom-style: none; border-bottom-width: thin; border-left-color: Silver; border-left-style: none; border-left-width: thin; border-right-color: Silver; border-right-style: none; border-right-width: thin; border-top-color: Silver; border-top-style: none; border-top-width: thin; padding-bottom: 0.25em; padding-left: pt; padding-right: pt; padding-top: 0.25em; vertical-align: top;">
<div class="CellBody"><a name="1584994">Not a RAID type - but supported as a configuration. </a></div>
<div class="CellBody"><a name="1584995">Provides maximum disk capacity with no redundancy.</a></div>
</td>
</tr>
</table>
<div class="Body"><a name="1584997">You can create one or more units, depending on the number of drives you </a>install. The following table provides possible configurations based on your number of drives.</div>
<div class="anchor"><a name="1585044">&nbsp;</a></div>
<table id="1584998" class="Two-column" style="margin-bottom: pt; margin-right: pt; padding-left: pt; padding-right: pt; text-align: left;" cellspacing="0">
<caption>
<div class="TableTitle"><a name="1585002">Possible Configurations Based on Number of Drives</a>&nbsp;</div>
</caption>
<tr style="vertical-align: top;">
<td id="tc1585007" style="background-color: LightSteelBlue; border-bottom-color: Black; border-bottom-style: solid; border-bottom-width: thin; border-left-color: #E0E0E0; border-left-style: none; border-left-width: thin; border-right-color: #E0E0E0; border-right-style: none; border-right-width: thin; border-top-color: Black; border-top-style: solid; border-top-width: thin; padding-bottom: 0.25em; padding-left: pt; padding-right: pt; padding-top: 0.25em; vertical-align: top; width: 71.90856pt;">
<div class="CellHeading"><a name="1585007">Number of </a>Drives</div>
</td>
<td id="tc1585009" style="background-color: LightSteelBlue; border-bottom-color: Black; border-bottom-style: solid; border-bottom-width: thin; border-left-color: #E0E0E0; border-left-style: none; border-left-width: thin; border-right-color: #E0E0E0; border-right-style: none; border-right-width: thin; border-top-color: Black; border-top-style: solid; border-top-width: thin; padding-bottom: 0.25em; padding-left: pt; padding-right: pt; padding-top: 0.25em; vertical-align: top; width: 269.21736pt;">
<div class="CellHeading"><a name="1585009">Possible RAID Configurations</a></div>
</td>
</tr>
<tr style="vertical-align: top;">
<td id="tc1585011" style="border-bottom-color: Silver; border-bottom-style: none; border-bottom-width: thin; border-left-color: Silver; border-left-style: none; border-left-width: thin; border-right-color: Silver; border-right-style: none; border-right-width: thin; border-top-color: Silver; border-top-style: none; border-top-width: thin; padding-bottom: 0.25em; padding-left: pt; padding-right: pt; padding-top: 0.25em; vertical-align: top;">
<div class="CellBody"><a name="1585011">1</a></div>
</td>
<td id="tc1585013" style="border-bottom-color: Silver; border-bottom-style: none; border-bottom-width: thin; border-left-color: Silver; border-left-style: none; border-left-width: thin; border-right-color: Silver; border-right-style: none; border-right-width: thin; border-top-color: Silver; border-top-style: none; border-top-width: thin; padding-bottom: 0.25em; padding-left: pt; padding-right: pt; padding-top: 0.25em; vertical-align: top;">
<div class="CellBody"><a name="1585013">Single disk</a></div>
</td>
</tr>
<tr style="vertical-align: top;">
<td id="tc1585015" style="background-color: WhiteSmoke; border-bottom-color: Silver; border-bottom-style: none; border-bottom-width: thin; border-left-color: Silver; border-left-style: none; border-left-width: thin; border-right-color: Silver; border-right-style: none; border-right-width: thin; border-top-color: Silver; border-top-style: none; border-top-width: thin; padding-bottom: 0.25em; padding-left: pt; padding-right: pt; padding-top: 0.25em; vertical-align: top;">
<div class="CellBody"><a name="1585015">2</a></div>
</td>
<td id="tc1585017" style="background-color: WhiteSmoke; border-bottom-color: Silver; border-bottom-style: none; border-bottom-width: thin; border-left-color: Silver; border-left-style: none; border-left-width: thin; border-right-color: Silver; border-right-style: none; border-right-width: thin; border-top-color: Silver; border-top-style: none; border-top-width: thin; padding-bottom: 0.25em; padding-left: pt; padding-right: pt; padding-top: 0.25em; vertical-align: top;">
<div class="CellBody"><a name="1585017">RAID 0 or RAID 1</a></div>
</td>
</tr>
<tr style="vertical-align: top;">
<td id="tc1585019" style="border-bottom-color: Silver; border-bottom-style: none; border-bottom-width: thin; border-left-color: Silver; border-left-style: none; border-left-width: thin; border-right-color: Silver; border-right-style: none; border-right-width: thin; border-top-color: Silver; border-top-style: none; border-top-width: thin; padding-bottom: 0.25em; padding-left: pt; padding-right: pt; padding-top: 0.25em; vertical-align: top;">
<div class="CellBody"><a name="1585019">3</a></div>
</td>
<td id="tc1585023" style="border-bottom-color: Silver; border-bottom-style: none; border-bottom-width: thin; border-left-color: Silver; border-left-style: none; border-left-width: thin; border-right-color: Silver; border-right-style: none; border-right-width: thin; border-top-color: Silver; border-top-style: none; border-top-width: thin; padding-bottom: 0.25em; padding-left: pt; padding-right: pt; padding-top: 0.25em; vertical-align: top;">
<div class="CellBody"><a name="1585021">RAID 0</a></div>
<div class="CellBody"><a name="1585022">RAID 1 with hot spare</a></div>
<div class="CellBody"><a name="1585023">RAID 5</a></div>
</td>
</tr>
<tr style="vertical-align: top;">
<td id="tc1585025" style="background-color: WhiteSmoke; border-bottom-color: Silver; border-bottom-style: none; border-bottom-width: thin; border-left-color: Silver; border-left-style: none; border-left-width: thin; border-right-color: Silver; border-right-style: none; border-right-width: thin; border-top-color: Silver; border-top-style: none; border-top-width: thin; padding-bottom: 0.25em; padding-left: pt; padding-right: pt; padding-top: 0.25em; vertical-align: top;">
<div class="CellBody"><a name="1585025">4</a></div>
</td>
<td id="tc1585029" style="background-color: WhiteSmoke; border-bottom-color: Silver; border-bottom-style: none; border-bottom-width: thin; border-left-color: Silver; border-left-style: none; border-left-width: thin; border-right-color: Silver; border-right-style: none; border-right-width: thin; border-top-color: Silver; border-top-style: none; border-top-width: thin; padding-bottom: 0.25em; padding-left: pt; padding-right: pt; padding-top: 0.25em; vertical-align: top;">
<div class="CellBody"><a name="1585027">RAID 5 with hot spare</a></div>
<div class="CellBody"><a name="1585028">RAID 10</a></div>
<div class="CellBody"><a name="1585029">Combination of RAID 0, RAID 1, single disk</a></div>
</td>
</tr>
<tr style="vertical-align: top;">
<td id="tc1585031" style="border-bottom-color: Silver; border-bottom-style: none; border-bottom-width: thin; border-left-color: Silver; border-left-style: none; border-left-width: thin; border-right-color: Silver; border-right-style: none; border-right-width: thin; border-top-color: Silver; border-top-style: none; border-top-width: thin; padding-bottom: 0.25em; padding-left: pt; padding-right: pt; padding-top: 0.25em; vertical-align: top;">
<div class="CellBody"><a name="1585031">5</a></div>
</td>
<td id="tc1585036" style="border-bottom-color: Silver; border-bottom-style: none; border-bottom-width: thin; border-left-color: Silver; border-left-style: none; border-left-width: thin; border-right-color: Silver; border-right-style: none; border-right-width: thin; border-top-color: Silver; border-top-style: none; border-top-width: thin; padding-bottom: 0.25em; padding-left: pt; padding-right: pt; padding-top: 0.25em; vertical-align: top;">
<div class="CellBody"><a name="1585033">RAID 6</a></div>
<div class="CellBody"><a name="1585034">RAID 5 with hot spare</a></div>
<div class="CellBody"><a name="1585035">RAID 10 with hot spare</a></div>
<div class="CellBody"><a name="1585036">Combination of RAID 0, RAID 1, hot spare, single disk</a></div>
</td>
</tr>
<tr style="vertical-align: top;">
<td id="tc1585038" style="background-color: WhiteSmoke; border-bottom-color: Silver; border-bottom-style: none; border-bottom-width: thin; border-left-color: Silver; border-left-style: none; border-left-width: thin; border-right-color: Silver; border-right-style: none; border-right-width: thin; border-top-color: Silver; border-top-style: none; border-top-width: thin; padding-bottom: 0.25em; padding-left: pt; padding-right: pt; padding-top: 0.25em; vertical-align: top;">
<div class="CellBody"><a name="1585038">6 or more</a></div>
</td>
<td id="tc1585043" style="background-color: WhiteSmoke; border-bottom-color: Silver; border-bottom-style: none; border-bottom-width: thin; border-left-color: Silver; border-left-style: none; border-left-width: thin; border-right-color: Silver; border-right-style: none; border-right-width: thin; border-top-color: Silver; border-top-style: none; border-top-width: thin; padding-bottom: 0.25em; padding-left: pt; padding-right: pt; padding-top: 0.25em; vertical-align: top;">
<div class="CellBody"><a name="1585040">RAID 6</a></div>
<div class="CellBody"><a name="1585041">RAID 6 with hot spare</a></div>
<div class="CellBody"><a name="1585042">RAID 50</a></div>
<div class="CellBody"><a name="1585043">Combination of RAID 0, 1, 5, 6,10, hot spare, single disk</a></div>
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