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<a class="WebWorks_Breadcrumb_Link" href="3ware_Intro.2.5.html#1585047">Understanding RAID Concepts and Levels</a> &gt; RAID Concepts &gt; Using Drive Capacity Efficiently</div>
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<div class="Heading2"><a name="1585047">Using Drive Capacity Efficiently</a></div>
<div class="Body"><a name="1585048">Because the capacity of each drive is limited to the capacity of the smallest </a>drive in the unit, use drives of the same capacity in a unit. </div>
<div class="Body"><a name="1585049">The total unit capacity is defined as follows:</a></div>
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<span class="Red"> </span><a name="1585089">&nbsp;</a></div>
<table id="1585050" 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="1585052">Drive Capacity</a></div>
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<td id="tc1585056" 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="1585056">RAID</a>&nbsp;Level</div>
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<td id="tc1585058" 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: 269.09208pt;">
<div class="CellHeading"><a name="1585058">Capacity</a></div>
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<td id="tc1585060" 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="1585060">Single Disk</a></div>
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<td id="tc1585062" 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="1585062">Capacity of the drive</a></div>
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<div class="CellBody"><a name="1585064">RAID 0</a></div>
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<td id="tc1585066" 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="1585066">(number of drives) X (capacity of the smallest drive)</a></div>
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<td id="tc1585068" 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="1585068">RAID 1 </a></div>
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<td id="tc1585070" 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="1585070">Capacity of the smallest drive</a></div>
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<div class="CellBody"><a name="1585072">RAID 5</a></div>
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<td id="tc1585076" 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="1585074">(number of drives </a>– 1) X (capacity of the smallest drive)</div>
<div class="CellBody"><a name="1585075">Storage efficiency increases with the number of disks:</a></div>
<div class="CellBody"><a name="1585076">storage efficiency = (number of drives </a>– 1)/(number of drives)</div>
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<div class="CellBody"><a name="1585078">RAID 6</a></div>
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<td id="tc1585080" 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="1585080">(number of drives </a>– 2) x (capacity of the smallest drive)</div>
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<td id="tc1585082" 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="1585082">RAID 10</a></div>
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<td id="tc1585084" 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="1585084">(number of drives/2) X (capacity of smallest drive)</a></div>
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<td id="tc1585086" 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="1585086">RAID 50 </a></div>
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<td id="tc1585088" 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="1585088">(number of drives </a>– number of groups of drives) X (capacity of the smallest drive)</div>
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<div class="Body"><a name="1585091">Through drive coercion, the capacity used for each drive is rounded down to </a>improve the likelihood that you can use drives from differing manufactures as spares for each other. The capacity used for each drive is rounded down to the nearest GB for drives under 45 GB (45,000,000,000 bytes), and rounded down to the nearest 5 GB for drives over 45 GB. For example, a 44.3-GB drive is rounded down to 44 GB, and a 123-GB drive is rounded down to 120&nbsp;GB. </div>
<div class="anchor">
<span class="Red"> </span><a name="1585100">&nbsp;</a></div>
<table id="1585095" 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">
<caption></caption>
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<img src="Note.gif" alt="*" id="bullet1585097" border="0" width="27" height="34" /><a name="1585097">&nbsp;</a></div>
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<td id="tc1585099" 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;">
<div class="CellBody"><span class="NoteHeading"><a name="1585099">Note:</a></span> All drives in a unit must be of the same type, either SAS or SATA. </div>
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<div class="RelatedTopic"><a href="3ware_Intro.2.6.html#1584775" name="1588005">RAID Concepts</a></div>
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<div class="RelatedTopic"><a href="3ware_Intro.2.7.html#1584812" name="1585126">Available RAID Configurations</a>&nbsp; </div>
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