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<a class="WebWorks_Breadcrumb_Link" href="Config_Units.6.1.html#1113125">Configuring Units</a> &gt; <a class="WebWorks_Breadcrumb_Link" href="Config_Units.6.8.html#1113125">Setting Unit Policies</a> &gt; Setting the StorSave Profile for a Unit</div>
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<div class="Heading2"><a name="1113125">Setting the StorSave Profile for a Unit</a></div>
<div class="BodyAfterHead"><a name="1387985">You can set the desired level of data protection versus performance for a unit </a>by selecting the StorSave Profile. Three profiles are provided: <span class="Emphasis">Protection</span> (maximum data protection), <span class="Emphasis">Performance</span> (maximum performance, less data protection), and <span class="Emphasis">Balanced</span> (a middle ground). The default is Balanced.</div>
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<div class="Bullet_inner"><a href="#1157100" name="2407463">About StorSave Profile Levels</a></div>
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<div class="Bullet_inner"><a href="#1193027" name="2407467">Setting the StorSave Profile through 3DM2</a></div>
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<div class="Heading3"><a name="1157100">About StorSave Profile Levels</a></div>
<div class="Body"><a name="1157092">The three profiles automatically adjust several different factors that affect </a>protection and performance on a per unit basis. These are summarized in the table below and further explained after the table.<span style="font-weight: bold;"> </span></div>
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<span class="Red"> </span><a name="1114448">&nbsp;</a></div>
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<div class="TableTitle-Wide"><a name="1114401">StorSave Profile Definitions</a></div>
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<div class="CellHeading"><a name="1114409">&nbsp;</a></div>
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<div class="CellHeading"><a name="1114411">Protection</a></div>
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<td id="tc1114413" 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: 113.99976pt;">
<div class="CellHeading"><a name="1114413">Balanced (Default)</a></div>
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<td id="tc1114415" 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: 113.99976pt;">
<div class="CellHeading"><a name="1114415">Performance</a></div>
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<div class="CellHeading"><a name="1114417">Definition</a></div>
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<div class="CellBody"><a name="1114419">Maximum data </a>protection, but slower performance.</div>
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<td id="tc1114421" 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="1114421">More data protection than </a><span class="Emphasis">Performance</span> but less data protection than <span class="Emphasis">Protection</span>.</div>
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<td id="tc1114423" 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="1114423">Maximum performance </a>for the unit, but less data protection.</div>
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<div class="CellHeading"><a name="1114425">FUA (Force Unit </a>Access)</div>
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<div class="CellBody"><a name="1672049">Honor FUA (If no BBU is </a>present)</div>
<div class="CellBody"><a name="1156607">Ignore FUA (If BBU is </a>present)</div>
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<td id="tc1156606" 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="1672055">Honor FUA (If no BBU is </a>present)</div>
<div class="CellBody"><a name="1156606">Ignore FUA (If BBU is </a>present)</div>
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<td id="tc1114431" 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="1114431">Ignore FUA</a></div>
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<div class="CellHeading"><a name="1114433">Write Journaling</a></div>
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<div class="CellBody"><a name="1114435">Enabled</a></div>
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<td id="tc1114437" 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="1114437">Disabled, if no BBU </a>present. (Enabled, if BBU is present.)</div>
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<div class="CellBody"><a name="1114439">Disabled (If BBU is </a>present, this essentially disables the BBU for this unit.)</div>
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<div class="CellHeading"><a name="1114441">Disable Cache on </a>Degrade</div>
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<td id="tc1114443" 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="1114443">Enabled</a></div>
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<td id="tc1114445" 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="1114445">Disabled </a></div>
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<td id="tc1114447" 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;">
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<div class="Bullet_inner"><span class="NoteHeading"><a name="2006244">FUA (Force Unit Access)</a></span>. The FUA bit is a way that the RAID controller or a program (such as a database program) can ensure that data is actually written to the disk drive media, and is not stored in cache. When a write command has the FUA bit set, then the disk drive will only issue “command complete” to the controller once the data is written to media. When performance is considered more important than protection, it may be desirable to ignore the FUA bit. </div>
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<div class="Indent"><a name="1116963">The Protection and Balanced profiles honor FUA commands if no BBU is </a>present; the Performance profile ignores them regardless of whether a BBU is present.</div>
<div class="Indent"><a name="1671312">If you use a battery backup unit (BBU), FUA is ignored, because the BBU </a>preserves the contents of the controller cache memory for a limited period of time (up to 72 hours), in the event of a power failure.</div>
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<div class="Bullet_inner"><span class="NoteHeading"><a name="1232142">Write Journaling</a></span>. Write journaling tracks the writing of data to disk and preserves a copy of data that has not yet been written to the disk media. Following a power failure or in the event of accidental drive removal and reinsertion, the firmware can recover the unit without data loss. All pending writes sitting in the controller cache are replayed after power is restored or the drive is reinserted and are flushed from the controller to the drive. </div>
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<div class="Indent"><a name="1232143">Using write journaling helps protect your data, however it can have an </a>impact on performance. </div>
<div class="Indent"><a name="1236937">The Protection profile always enables write journaling and the </a>Performance profile always disables write journaling, regardless of the presence of a BBU. The Balanced Profile disables write journaling if no BBU is present, and enables write journaling if a BBU is present.</div>
<div class="Indent"><a name="1671322">If write journaling is disabled and a BBU is present, then it is as if the </a>BBU was disabled for that unit.</div>
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<div class="Bullet_inner"><span class="NoteHeading"><a name="1232146">Write cache disabled on degrade</a></span>. In the event that a unit degrades, the use of write cache can be disabled until the unit is rebuilt. Once the unit is rebuilt, the write cache will automatically be re-enabled.</div>
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<div class="Indent"><a name="1232147">The Protection profile enables this feature, so that write cache is disabled </a>in the event a unit degrades; the Performance and Balanced profiles disable this feature, so that write cache continues to be enabled.</div>
<div class="Heading3"><a name="1193027">Setting the StorSave Profile through 3DM2</a></div>
<div class="Body"><a name="1193028">In 3DM2, the StorSave Profile is a unit policy that can be set on the </a><span class="UI-Element">Controller Settings</span> page.</div>
<div class="ToDo"><a name="1157061">To set the StorSave profile through 3DM2</a></div>
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<span class="UI-Element">1 </span>
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<div class="NumberedFirst_inner"><a name="1114995">Choose </a><span class="UI-Element">Management &gt;&gt; Controller Settings</span> from the menu bar in 3DM2.</div>
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<div class="Numbered_inner"><a name="1114766">In the </a><span class="UI-Element">Unit Policies </span>section of the <a href="Controller_Settings.html#1088416">Controller Settings page</a>, select the profile you want to use from the drop-down list in the StorSave column.</div>
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<div class="Indent"><a name="1114986">The page refreshes, and a message at the top confirms the change you </a>have made.</div>
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<dl>
<dt>Related Topics</dt>
<dd>
<div class="RelatedTopic"><a href="Config_Units.6.9.html#1113091" name="2407475">Enabling and Disabling the Unit Write Cache</a></div>
</dd>
<dd>
<div class="RelatedTopic"><a href="Config_Units.6.10.html#2185087" name="2407479">Working with Read Cache Settings</a></div>
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<dd>
<div class="RelatedTopic"><a href="Config_Units.6.11.html#2185080" name="2407483">Enabling or Disabling Auto-Verify for a Unit</a></div>
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<dd>
<div class="RelatedTopic"><a href="Config_Units.6.12.html#1589821" name="2407487">Setting Overwrite ECC (Continue on Source Error When Rebuilding)</a></div>
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<dd>
<div class="RelatedTopic"><a href="Config_Units.6.13.html#1173071" name="2407491">Enabling and Disabling Queuing for a Unit</a></div>
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<dd>
<div class="RelatedTopic"><a href="Config_Units.6.15.html#2055333" name="2407495">Rapid RAID Recovery</a></div>
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