202 lines
13 KiB
HTML
202 lines
13 KiB
HTML
|
<?xml version="1.0" encoding="utf-8"?>
|
||
|
|
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
|
||
|
|
<html xml:lang="en" lang="en" xmlns="http://www.w3.org/1999/xhtml">
|
||
|
|
<head>
|
||
|
|
<meta http-equiv="Content-Type" content="text/html;charset=utf-8" />
|
||
|
|
<meta http-equiv="Content-Style-Type" content="text/css" />
|
||
|
|
<title>Enabling and Disabling the Unit Write Cache</title>
|
||
|
|
<link rel="StyleSheet" href="css/Config_Units.css" type="text/css" media="all" />
|
||
|
|
<link rel="StyleSheet" href="css/webworks.css" type="text/css" media="all" />
|
||
|
|
<script type="text/javascript" language="JavaScript1.2" src="scripts/expand.js"></script>
|
||
|
|
<script type="text/javascript" language="JavaScript1.2" src="scripts/seealso.js"></script>
|
||
|
|
<script type="text/javascript" language="JavaScript1.2">
|
||
|
|
<!--
|
||
|
|
var WebWorksRootPath = "";
|
||
|
|
// -->
|
||
|
|
</script>
|
||
|
|
<script type="text/javascript" language="JavaScript1.2">
|
||
|
|
<!--
|
||
|
|
var WebWorksSeeAlso = "xxx";
|
||
|
|
// -->
|
||
|
|
</script>
|
||
|
|
</head>
|
||
|
|
<body style="">
|
||
|
|
<table align="right">
|
||
|
|
<tr>
|
||
|
|
<td style="text-align: left;">
|
||
|
|
<a href="http://www.lsi.com/channel/products" target="_blank">
|
||
|
|
<img src="LSI-logo.jpg" border="0" />
|
||
|
|
</a>
|
||
|
|
</td>
|
||
|
|
</tr>
|
||
|
|
</table>
|
||
|
|
<div style="text-align: left;">
|
||
|
|
<p style="color: Navy; font-weight:bold">3DM2™ Online
|
||
|
|
Help</p>
|
||
|
|
<table cellspacing="0">
|
||
|
|
<tr>
|
||
|
|
<td>
|
||
|
|
<a href="toc.html">
|
||
|
|
<img src="images/toc.gif" alt="Table of Contents" border="0" />
|
||
|
|
</a>
|
||
|
|
</td>
|
||
|
|
<td>
|
||
|
|
<a href="Config_Units.6.8.html">
|
||
|
|
<img src="images/prev.gif" alt="Previous" border="0" />
|
||
|
|
</a>
|
||
|
|
</td>
|
||
|
|
<td>
|
||
|
|
<a href="Config_Units.6.10.html">
|
||
|
|
<img src="images/next.gif" alt="Next" border="0" />
|
||
|
|
</a>
|
||
|
|
</td>
|
||
|
|
<td>
|
||
|
|
<a href="ix.html">
|
||
|
|
<img src="images/index.gif" alt="Index" border="0" />
|
||
|
|
</a>
|
||
|
|
</td>
|
||
|
|
</tr>
|
||
|
|
</table>
|
||
|
|
</div>
|
||
|
|
<br clear="all" />
|
||
|
|
<br />
|
||
|
|
<div class="WebWorks_Breadcrumbs" style="text-align: left;">
|
||
|
|
<a class="WebWorks_Breadcrumb_Link" href="Config_Units.6.1.html#1113091">Configuring Units</a> > <a class="WebWorks_Breadcrumb_Link" href="Config_Units.6.8.html#1113091">Setting Unit Policies</a> > Enabling and Disabling the Unit Write Cache</div>
|
||
|
|
<hr align="left" />
|
||
|
|
<div>
|
||
|
|
<div class="Heading2"><a name="1113091">Enabling and Disabling the Unit Write Cache</a></div>
|
||
|
|
<div class="Body"><a name="1233520">Write cache is used to store data locally in memory on the controller before it </a>is written to the disk drive media, allowing the computer to continue with its next task. This improves performance. However, there may be instances when you want the computer to wait for the drive to write all the data to disk before going on to its next task. In this case, you must disable the write cache. </div>
|
||
|
|
<div class="anchor">
|
||
|
|
<span class="Red"> </span><a name="1337811"> </a></div>
|
||
|
|
<table id="1337813" 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>
|
||
|
|
<tr style="vertical-align: top;">
|
||
|
|
<td id="tc1337815" 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="NoteAnchor">
|
||
|
|
<img src="Note.gif" alt="*" id="bullet1337815" border="0" width="27" height="34" /><a name="1337815"> </a></div>
|
||
|
|
</td>
|
||
|
|
<td id="tc1337817" 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="1337817">Note:</a></span> If write cache is enabled, in the event of a power failure, the data in the controller cache will be lost if you do not have a Battery Backup Unit (BBU). To avoid a sudden power failure if you do not have a BBU, it is advisable to have an Uninterruptible Power Supply (UPS). </div>
|
||
|
|
</td>
|
||
|
|
</tr>
|
||
|
|
</table>
|
||
|
|
<div class="Body"><a name="2172039">Write cache can be turned on or off for individual units in 3DM2, CLI, and </a>3BM without changing the configuration or losing data from the drives. </div>
|
||
|
|
<div class="Body"><a name="1671220">If you have a BBU (Battery Backup Unit) installed on the controller, the </a>battery preserves the contents of the controller cache memory for a limited period of time (up to 72 hours) in the event of a system power loss. When a BBU is installed, if the battery is not “Ready,” write cache is disabled and cannot be enabled. </div>
|
||
|
|
<div class="Body"><a name="1705015">The unit's StorSave profile can also determine whether the write cache can be </a>enabled or disabled. A warning message will be given if the change is not permitted due to the StorSave setting and the state of the unit.</div>
|
||
|
|
<div class="anchor">
|
||
|
|
<span class="Red"> </span><a name="1199821"> </a></div>
|
||
|
|
<table id="1269527" 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>
|
||
|
|
<tr style="vertical-align: top;">
|
||
|
|
<td id="tc1269529" 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="NoteAnchor">
|
||
|
|
<img src="Note.gif" alt="*" id="bullet1269529" border="0" width="27" height="34" /><a name="1269529"> </a></div>
|
||
|
|
</td>
|
||
|
|
<td id="tc1269538" 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="1269538">Note:</a></span><span class="NoteHeading"> </span>If the <span class="UI-Element-in-Table">Write Cache</span><span class="UI-Element"> </span>checkbox is disabled (not selectable), check to see if the unit has degraded or if the BBU is not ready. If a unit has a StorSave policy of “Protect” and the unit degrades, the policy prevents write cache from being re-enabled until the unit has been rebuilt or until the BBU is ready to use.</div>
|
||
|
|
</td>
|
||
|
|
</tr>
|
||
|
|
</table>
|
||
|
|
<div class="ToDo"><a name="1199790">To enable or disable unit write cache through 3DM2</a></div>
|
||
|
|
<div class="NumberedFirst_outer" style="margin-left: NaN;">
|
||
|
|
<table border="0" cellspacing="0" cellpadding="0" id="SummaryNotRequired_np1072955">
|
||
|
|
<tr style="vertical-align: baseline;">
|
||
|
|
<td>
|
||
|
|
<div class="NumberedFirst_inner" style="width: 1.5em; white-space: nowrap;">
|
||
|
|
<span class="UI-Element">1 </span>
|
||
|
|
</div>
|
||
|
|
</td>
|
||
|
|
<td width="100%">
|
||
|
|
<div class="NumberedFirst_inner"><a name="1072955">Choose </a><span class="UI-Element">Management >> Controller Settings</span> from the menu bar in 3DM2.</div>
|
||
|
|
</td>
|
||
|
|
</tr>
|
||
|
|
</table>
|
||
|
|
</div>
|
||
|
|
<div class="Numbered_outer" style="margin-left: NaN;">
|
||
|
|
<table border="0" cellspacing="0" cellpadding="0" id="SummaryNotRequired_np1072956">
|
||
|
|
<tr style="vertical-align: baseline;">
|
||
|
|
<td>
|
||
|
|
<div class="Numbered_inner" style="width: 1.5em; white-space: nowrap;">
|
||
|
|
<span class="UI-Element">2 </span>
|
||
|
|
</div>
|
||
|
|
</td>
|
||
|
|
<td width="100%">
|
||
|
|
<div class="Numbered_inner"><a name="1072956">In the </a><span class="UI-Element">Unit Policies </span>section of the <a href="Controller_Settings.html#1088416">Controller Settings page</a>, check the Write Cache box to enable it for the designated unit. </div>
|
||
|
|
</td>
|
||
|
|
</tr>
|
||
|
|
</table>
|
||
|
|
</div>
|
||
|
|
<div class="FigureIndent" onclick="WebWorks_ToggleDIV(WebWorksRootPath, "wwdd2190239");"><a name="2190239">Show </a>Write Cache Policy in 3DM2<script type="text/javascript" language="JavaScript1.2">WebWorks_WriteArrow(WebWorksRootPath, "wwdd2190239", false);</script></div>
|
||
|
|
<script type="text/javascript" language="JavaScript1.2">WebWorks_WriteDIVOpen("wwdd2190239", false);</script>
|
||
|
|
<div class="anchor-indented"><a name="1082146"><img id="1082150" class="Default" src="images/enable-write-cache.gif" width="373" height="111" style="display: inline; float: none; left: 0.0; text-align: left; top: 0.0;" /></a></div>
|
||
|
|
<script type="text/javascript" language="JavaScript1.2">WebWorks_WriteDIVClose();</script>
|
||
|
|
<div class="Indent"><a name="1352487">The page refreshes, and a message at the top confirms the change you </a>have made.</div>
|
||
|
|
<div class="Indent"><a name="1352504">If your system has no BBU, a message will caution you about enabling </a>write cache.</div>
|
||
|
|
<hr />
|
||
|
|
<dl>
|
||
|
|
<dt>Related Topics</dt>
|
||
|
|
<dd>
|
||
|
|
<div class="RelatedTopic"><a href="Config_Units.6.10.html#2185087" name="2407318">Working with Read Cache Settings</a></div>
|
||
|
|
</dd>
|
||
|
|
<dd>
|
||
|
|
<div class="RelatedTopic"><a href="Config_Units.6.11.html#2185080" name="2407322">Enabling or Disabling Auto-Verify for a Unit</a></div>
|
||
|
|
</dd>
|
||
|
|
<dd>
|
||
|
|
<div class="RelatedTopic"><a href="Config_Units.6.12.html#1589821" name="2407326">Setting Overwrite ECC (Continue on Source Error When Rebuilding)</a></div>
|
||
|
|
</dd>
|
||
|
|
<dd>
|
||
|
|
<div class="RelatedTopic"><a href="Config_Units.6.13.html#1173071" name="2407330">Enabling and Disabling Queuing for a Unit</a></div>
|
||
|
|
</dd>
|
||
|
|
<dd>
|
||
|
|
<div class="RelatedTopic"><a href="Config_Units.6.14.html#1113125" name="2407334">Setting the StorSave Profile for a Unit</a></div>
|
||
|
|
</dd>
|
||
|
|
<dd>
|
||
|
|
<div class="RelatedTopic"><a href="Config_Units.6.15.html#2055333" name="2407338">Rapid RAID Recovery</a></div>
|
||
|
|
</dd>
|
||
|
|
</dl>
|
||
|
|
</div>
|
||
|
|
<hr align="left" />
|
||
|
|
<div style="text-align: left;">
|
||
|
|
<table cellspacing="0">
|
||
|
|
<tr>
|
||
|
|
<td>
|
||
|
|
<a href="toc.html">
|
||
|
|
<img src="images/toc.gif" alt="Table of Contents" border="0" />
|
||
|
|
</a>
|
||
|
|
</td>
|
||
|
|
<td>
|
||
|
|
<a href="Config_Units.6.8.html">
|
||
|
|
<img src="images/prev.gif" alt="Previous" border="0" />
|
||
|
|
</a>
|
||
|
|
</td>
|
||
|
|
<td>
|
||
|
|
<a href="Config_Units.6.10.html">
|
||
|
|
<img src="images/next.gif" alt="Next" border="0" />
|
||
|
|
</a>
|
||
|
|
</td>
|
||
|
|
<td>
|
||
|
|
<a href="ix.html">
|
||
|
|
<img src="images/index.gif" alt="Index" border="0" />
|
||
|
|
</a>
|
||
|
|
</td>
|
||
|
|
</tr>
|
||
|
|
</table>
|
||
|
|
</div>
|
||
|
|
<table align="right">
|
||
|
|
<tr>
|
||
|
|
<td style="text-align: left;">
|
||
|
|
<a href="http://www.lsi.com/channel/products" target="_blank">
|
||
|
|
<img src="LSI-logo.jpg" border="0" />
|
||
|
|
</a>
|
||
|
|
</td>
|
||
|
|
</tr>
|
||
|
|
<tr>
|
||
|
|
<td style="text-align: left; font-size: 16px ; font-weight: bold">
|
||
|
|
<a href="http://www.lsi.com/channel/products" target="_blank">LSI Corporation</a>
|
||
|
|
</td>
|
||
|
|
</tr>
|
||
|
|
</table>
|
||
|
|
<p style="font-size: .8em">Copyright LSI 2004-2010<br />
|
||
|
|
To contact Support, go to <a href="http://www.lsi.com/channel/ContactUs">http://www.lsi.com/channel/ContactUs</a></p>
|
||
|
|
</body>
|
||
|
|
</html>
|