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<?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" /> <meta name="keywords" content="MegaRAID SAS SW UG" /> <title>Selecting Virtual Drive Settings</title> <link rel="StyleSheet" href="css/v10392197.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="wwhdata/common/context.js"></script> <script type="text/javascript" language="JavaScript1.2" src="wwhdata/common/towwhdir.js"></script> <script type="text/javascript" language="JavaScript1.2" src="wwhdata/common/wwhpagef.js"></script> <script type="text/javascript" language="JavaScript1.2"> <!-- var WebWorksRootPath = ""; // --> </script> <script type="text/javascript" language="JavaScript1.2"> <!-- // Set reference to top level help frame // var WWHFrame = WWHGetWWHFrame("", true); // --> </script> <script type="text/javascript" language="JavaScript1.2" src="scripts/expand.js"></script> </head> <body onload="WWHUpdate();" onunload="WWHUnload();" onkeydown="WWHHandleKeyDown((document.all||document.getElementById||document.layers)?event:null);" onkeypress="WWHHandleKeyPress((document.all||document.getElementById||document.layers)?event:null);" onkeyup="WWHHandleKeyUp((document.all||document.getElementById||document.layers)?event:null);"> <br /> <div class="WebWorks_Breadcrumbs" style="text-align: left;"> <a class="WebWorks_Breadcrumb_Link" href="MSM_MR_help-4-01.html">Configuration</a> : <a class="WebWorks_Breadcrumb_Link" href="MSM_MR_help-4-02.html">Creating a New Configuration</a> : Selecting Virtual Drive Settings</div> <hr align="left" /> <blockquote> <p class="Heading_2"><a name="3_8_6_8_1">Selecting Virtual Drive Settings</a></p> <p class="Body"><a name="3_8_6_8_3_1">This section describes the virtual drive settings that you can select when you use the advanced configuration procedure to create virtual drives. You should change these parameters only if you have a specific reason for doing so. It is usually best to leave them at their default settings.</a></p> <div class="List_1_outer" style="margin-left: 1px"> <table border="0" cellspacing="0" cellpadding="0" summary="" role="presentation"> <tr style="vertical-align: baseline"> <td> <p class="List_1_inner" style="width: 18pt; white-space: nowrap"> <img src="square.png" alt="*" border="0" width="5" height="5" /> </p> </td> <td width="100%"> <p class="List_1_inner"><span class="Bold"><a name="3_8_6_8_3_2_1">Initialization state:</a></span></p> </td> </tr> </table> </div> <p class="List_1_Continued"><a name="3_8_6_8_3_2_1_4">Initialization prepares the storage medium for use. Specify the initialization status:</a></p> <div class="List_2_outer" style="margin-left: 26px"> <table border="0" cellspacing="0" cellpadding="0" summary="" role="presentation"> <tr style="vertical-align: baseline"> <td> <p class="List_2_inner" style="width: 18pt; white-space: nowrap"> <img src="line.png" alt="*" border="0" width="5" height="5" /> </p> </td> <td width="100%"> <p class="List_2_inner"><span class="uicontrol"><a name="3_8_6_8_3_3_1_3_1">No Initialization</a></span> (Default)</p> </td> </tr> </table> </div> <p class="List_2_Continued"><a name="3_8_6_8_3_3_1_3_1_5">The new configuration is not initialized, and the existing data on the drives is not overwritten.</a></p> <div class="List_2_outer" style="margin-left: 26px"> <table border="0" cellspacing="0" cellpadding="0" summary="" role="presentation"> <tr style="vertical-align: baseline"> <td> <p class="List_2_inner" style="width: 18pt; white-space: nowrap"> <img src="line.png" alt="*" border="0" width="5" height="5" /> </p> </td> <td width="100%"> <p class="List_2_inner"><span class="uicontrol"><a name="3_8_6_8_3_3_1_3_2">Fast Initialization</a></span></p> </td> </tr> </table> </div> <p class="List_2_Continued"><a name="3_8_6_8_3_3_1_3_2_4">The firmware quickly writes 0s to the first and last 8-MB regions of the new virtual drive and then completes the initialization in the background. This allows you to start writing data to the virtual drive immediately.</a></p> <div class="List_2_outer" style="margin-left: 26px"> <table border="0" cellspacing="0" cellpadding="0" summary="" role="presentation"> <tr style="vertical-align: baseline"> <td> <p class="List_2_inner" style="width: 18pt; white-space: nowrap"> <img src="line.png" alt="*" border="0" width="5" height="5" /> </p> </td> <td width="100%"> <p class="List_2_inner"><span class="uicontrol"><a name="3_8_6_8_3_3_1_3_3">Full Initialization</a></span></p> </td> </tr> </table> </div> <p class="List_2_Continued"><a name="3_8_6_8_3_3_1_3_3_4">A complete initialization is done on the new configuration. You cannot write data to the new virtual drive until the initialization is complete. This process can take a long time if the drives are large.</a></p> <p class="note_2"> <span style="font-family: Sans-Serif; font-weight: bold">NOTE </span><a name="3_8_6_8_3_3_1_3_3_5">BGI is supported only for RAID 5 and RAID 6 and not for any other RAID levels. New RAID 5 virtual drives require at least five drives for a background initialization to start. New RAID 6 virtual drives require at least seven drives for a background initialization to start. If there are fewer drives, the background initialization does not start.</a></p> <div class="List_1_outer" style="margin-left: 1px"> <table border="0" cellspacing="0" cellpadding="0" summary="" role="presentation"> <tr style="vertical-align: baseline"> <td> <p class="List_1_inner" style="width: 18pt; white-space: nowrap"> <img src="square.png" alt="*" border="0" width="5" height="5" /> </p> </td> <td width="100%"> <p class="List_1_inner"><span class="Bold"><a name="3_8_6_8_3_4_1">Strip size</a></span></p> </td> </tr> </table> </div> <p class="List_1_Continued"><a name="3_8_6_8_3_4_1_4">Strip sizes of 8 KB, 16 KB, 32 KB, 64 KB, 128 KB, 256 KB, 512 KB, and 1024 KB are supported. The default is 64 KB. For more information, see the </a><span class="Italic">striping</span> entry in the <span class="Bold">Glossary</span>.</p> <div class="List_1_outer" style="margin-left: 1px"> <table border="0" cellspacing="0" cellpadding="0" summary="" role="presentation"> <tr style="vertical-align: baseline"> <td> <p class="List_1_inner" style="width: 18pt; white-space: nowrap"> <img src="square.png" alt="*" border="0" width="5" height="5" /> </p> </td> <td width="100%"> <p class="List_1_inner"><span class="Bold"><a name="3_8_6_8_3_4_2">Read policy</a></span></p> </td> </tr> </table> </div> <p class="List_1_Continued"><a name="3_8_6_8_3_4_2_4">Specify the read policy for this virtual drive:</a></p> <div class="List_2_outer" style="margin-left: 26px"> <table border="0" cellspacing="0" cellpadding="0" summary="" role="presentation"> <tr style="vertical-align: baseline"> <td> <p class="List_2_inner" style="width: 18pt; white-space: nowrap"> <img src="line.png" alt="*" border="0" width="5" height="5" /> </p> </td> <td width="100%"> <p class="List_2_inner"><span class="uicontrol"><a name="3_8_6_8_3_5_1_3_1">Always read ahead</a></span></p> </td> </tr> </table> </div> <p class="List_2_Continued"><a name="3_8_6_8_3_5_1_3_1_4">Read ahead capability allows the controller to read sequentially ahead of requested data and to store the additional data in cache memory, anticipating that the data will be needed soon. This process speeds up reads for sequential data, but little improvement occurs when accessing random data.</a></p> <div class="List_2_outer" style="margin-left: 26px"> <table border="0" cellspacing="0" cellpadding="0" summary="" role="presentation"> <tr style="vertical-align: baseline"> <td> <p class="List_2_inner" style="width: 18pt; white-space: nowrap"> <img src="line.png" alt="*" border="0" width="5" height="5" /> </p> </td> <td width="100%"> <p class="List_2_inner"><span class="uicontrol"><a name="3_8_6_8_3_5_1_3_2">No read ahead</a></span> (Default)</p> </td> </tr> </table> </div> <p class="List_2_Continued"><a name="3_8_6_8_3_5_1_3_2_5">Disables the read ahead capability.</a></p> <div class="List_1_outer" style="margin-left: 1px"> <table border="0" cellspacing="0" cellpadding="0" summary="" role="presentation"> <tr style="vertical-align: baseline"> <td> <p class="List_1_inner" style="width: 18pt; white-space: nowrap"> <img src="square.png" alt="*" border="0" width="5" height="5" /> </p> </td> <td width="100%"> <p class="List_1_inner"><span class="Bold"><a name="3_8_6_8_3_6_1">Write policy</a></span></p> </td> </tr> </table> </div> <p class="List_1_Continued"><a name="3_8_6_8_3_6_1_5">Specify the write policy for this virtual drive:</a></p> <div class="List_2_outer" style="margin-left: 26px"> <table border="0" cellspacing="0" cellpadding="0" summary="" role="presentation"> <tr style="vertical-align: baseline"> <td> <p class="List_2_inner" style="width: 18pt; white-space: nowrap"> <img src="line.png" alt="*" border="0" width="5" height="5" /> </p> </td> <td width="100%"> <p class="List_2_inner"><span class="uicontrol"><a name="3_8_6_8_3_7_1_3_1">Write Through</a></span></p> </td> </tr> </table> </div> <p class="List_2_Continued"><a name="3_8_6_8_3_7_1_3_1_4">In this mode, the controller sends a data transfer completion signal to the host when the drive subsystem has received all of the data in a transaction. This option eliminates the risk of losing cached data in case of a power failure.</a></p> <div class="List_2_outer" style="margin-left: 26px"> <table border="0" cellspacing="0" cellpadding="0" summary="" role="presentation"> <tr style="vertical-align: baseline"> <td> <p class="List_2_inner" style="width: 18pt; white-space: nowrap"> <img src="line.png" alt="*" border="0" width="5" height="5" /> </p> </td> <td width="100%"> <p class="List_2_inner"><span class="uicontrol"><a name="3_8_6_8_3_7_1_3_2">Always Write Back</a></span></p> </td> </tr> </table> </div> <p class="List_2_Continued"><a name="3_8_6_8_3_7_1_3_2_4">In this mode, the controller sends a data transfer completion signal to the host when the controller cache receives all the data in a transaction. If you select the Always Write Back policy and the battery is absent, the firmware is forced to use the Write Back policy.</a></p> <div class="List_2_outer" style="margin-left: 26px"> <table border="0" cellspacing="0" cellpadding="0" summary="" role="presentation"> <tr style="vertical-align: baseline"> <td> <p class="List_2_inner" style="width: 18pt; white-space: nowrap"> <img src="line.png" alt="*" border="0" width="5" height="5" /> </p> </td> <td width="100%"> <p class="List_2_inner"><span class="uicontrol"><a name="3_8_6_8_3_7_1_3_3">Write Back</a></span> (Default)</p> </td> </tr> </table> </div> <p class="List_2_Continued"><a name="3_8_6_8_3_7_1_3_3_5">In this mode, the controller sends a data transfer completion signal to the host when the controller cache receives all of the data in a transaction. If you select the Write Back policy and the battery is absent, the firmware disables the Write Back policy and defaults to the Write Through policy. This option provides a good balance between data protection and performance.</a></p> <p class="note_2"> <span style="font-family: Sans-Serif; font-weight: bold">NOTE </span><a name="3_8_6_8_3_7_1_3_3_6">The write policy depends on the status of the BBU. If the BBU is not present, is low, is failed, or is being charged, the current write policy switches to Write Through, which provides better data protection.</a></p> <div class="List_1_outer" style="margin-left: 1px"> <table border="0" cellspacing="0" cellpadding="0" summary="" role="presentation"> <tr style="vertical-align: baseline"> <td> <p class="List_1_inner" style="width: 18pt; white-space: nowrap"> <img src="square.png" alt="*" border="0" width="5" height="5" /> </p> </td> <td width="100%"> <p class="List_1_inner"><span class="Bold"><a name="3_8_6_8_3_8_1">I/O policy</a></span></p> </td> </tr> </table> </div> <p class="List_1_Continued"><a name="3_8_6_8_3_8_1_4">The I/O policy applies to reads on a specific virtual drive. It does not affect the read ahead cache.</a></p> <div class="List_2_outer" style="margin-left: 26px"> <table border="0" cellspacing="0" cellpadding="0" summary="" role="presentation"> <tr style="vertical-align: baseline"> <td> <p class="List_2_inner" style="width: 18pt; white-space: nowrap"> <img src="line.png" alt="*" border="0" width="5" height="5" /> </p> </td> <td width="100%"> <p class="List_2_inner"><span class="uicontrol"><a name="3_8_6_8_3_9_1_3_1">Cached IO</a></span></p> </td> </tr> </table> </div> <p class="List_2_Continued"><a name="3_8_6_8_3_9_1_3_1_4">In this mode, all reads are buffered in cache memory.</a></p> <div class="List_2_outer" style="margin-left: 26px"> <table border="0" cellspacing="0" cellpadding="0" summary="" role="presentation"> <tr style="vertical-align: baseline"> <td> <p class="List_2_inner" style="width: 18pt; white-space: nowrap"> <img src="line.png" alt="*" border="0" width="5" height="5" /> </p> </td> <td width="100%"> <p class="List_2_inner"><span class="uicontrol"><a name="3_8_6_8_3_9_1_3_2">Direct IO</a></span> (Default)</p> </td> </tr> </table> </div> <p class="List_2_Continued"><a name="3_8_6_8_3_9_1_3_2_5">In this mode, reads are not buffered in cache memory. Data is transferred to the cache and the host concurrently. If the same data block is read again, it comes from cache memory.</a></p> <p class="List_1_Continued"><span class="uicontrol"><a name="3_8_6_8_3_9_1_4">Cached IO</a></span> provides faster processing, and <span class="uicontrol">Direct IO</span> makes sure that the cache and the host contain the same data.</p> <div class="List_1_outer" style="margin-left: 1px"> <table border="0" cellspacing="0" cellpadding="0" summary="" role="presentation"> <tr style="vertical-align: baseline"> <td> <p class="List_1_inner" style="width: 18pt; white-space: nowrap"> <img src="square.png" alt="*" border="0" width="5" height="5" /> </p> </td> <td width="100%"> <p class="List_1_inner"><span class="Bold"><a name="3_8_6_8_3_10_1">Access policy</a></span></p> </td> </tr> </table> </div> <p class="List_1_Continued"><a name="3_8_6_8_3_10_1_4">Select the type of data access that is allowed for this virtual drive.</a></p> <div class="List_2_outer" style="margin-left: 26px"> <table border="0" cellspacing="0" cellpadding="0" summary="" role="presentation"> <tr style="vertical-align: baseline"> <td> <p class="List_2_inner" style="width: 18pt; white-space: nowrap"> <img src="line.png" alt="*" border="0" width="5" height="5" /> </p> </td> <td width="100%"> <p class="List_2_inner"><span class="uicontrol"><a name="3_8_6_8_3_11_1_3_1">Read/Write</a></span> (Default)</p> </td> </tr> </table> </div> <p class="List_2_Continued"><a name="3_8_6_8_3_11_1_3_1_5">Allow read/write access. This setting is the default value.</a></p> <div class="List_2_outer" style="margin-left: 26px"> <table border="0" cellspacing="0" cellpadding="0" summary="" role="presentation"> <tr style="vertical-align: baseline"> <td> <p class="List_2_inner" style="width: 18pt; white-space: nowrap"> <img src="line.png" alt="*" border="0" width="5" height="5" /> </p> </td> <td width="100%"> <p class="List_2_inner"><span class="uicontrol"><a name="3_8_6_8_3_11_1_3_2">Read Only</a></span></p> </td> </tr> </table> </div> <p class="List_2_Continued"><a name="3_8_6_8_3_11_1_3_2_4">Allow read-only access.</a></p> <div class="List_2_outer" style="margin-left: 26px"> <table border="0" cellspacing="0" cellpadding="0" summary="" role="presentation"> <tr style="vertical-align: baseline"> <td> <p class="List_2_inner" style="width: 18pt; white-space: nowrap"> <img src="line.png" alt="*" border="0" width="5" height="5" /> </p> </td> <td width="100%"> <p class="List_2_inner"><span class="uicontrol"><a name="3_8_6_8_3_11_1_3_3">Blocked</a></span></p> </td> </tr> </table> </div> <p class="List_2_Continued"><a name="3_8_6_8_3_11_1_3_3_4">Do not allow access.</a></p> <div class="List_1_outer" style="margin-left: 1px"> <table border="0" cellspacing="0" cellpadding="0" summary="" role="presentation"> <tr style="vertical-align: baseline"> <td> <p class="List_1_inner" style="width: 18pt; white-space: nowrap"> <img src="square.png" alt="*" border="0" width="5" height="5" /> </p> </td> <td width="100%"> <p class="List_1_inner"><span class="Bold"><a name="3_8_6_8_3_12_1">Disk cache policy</a></span></p> </td> </tr> </table> </div> <p class="List_1_Continued"><a name="3_8_6_8_3_12_1_4">Select a cache setting for this drive:</a></p> <div class="List_2_outer" style="margin-left: 26px"> <table border="0" cellspacing="0" cellpadding="0" summary="" role="presentation"> <tr style="vertical-align: baseline"> <td> <p class="List_2_inner" style="width: 18pt; white-space: nowrap"> <img src="line.png" alt="*" border="0" width="5" height="5" /> </p> </td> <td width="100%"> <p class="List_2_inner"><span class="uicontrol"><a name="3_8_6_8_3_13_1_3_1">Enabled</a></span></p> </td> </tr> </table> </div> <p class="List_2_Continued"><a name="3_8_6_8_3_13_1_3_1_4">Enable the disk cache.</a></p> <div class="List_2_outer" style="margin-left: 26px"> <table border="0" cellspacing="0" cellpadding="0" summary="" role="presentation"> <tr style="vertical-align: baseline"> <td> <p class="List_2_inner" style="width: 18pt; white-space: nowrap"> <img src="line.png" alt="*" border="0" width="5" height="5" /> </p> </td> <td width="100%"> <p class="List_2_inner"><span class="uicontrol"><a name="3_8_6_8_3_13_1_3_2">Disabled</a></span> (Default)</p> </td> </tr> </table> </div> <p class="List_2_Continued"><a name="3_8_6_8_3_13_1_3_2_5">Disable the disk cache.</a></p> <div class="List_2_outer" style="margin-left: 26px"> <table border="0" cellspacing="0" cellpadding="0" summary="" role="presentation"> <tr style="vertical-align: baseline"> <td> <p class="List_2_inner" style="width: 18pt; white-space: nowrap"> <img src="line.png" alt="*" border="0" width="5" height="5" /> </p> </td> <td width="100%"> <p class="List_2_inner"><span class="uicontrol"><a name="3_8_6_8_3_13_1_3_3">Unchanged</a></span></p> </td> </tr> </table> </div> <p class="List_2_Continued"><a name="3_8_6_8_3_13_1_3_3_4">Leave the current disk cache policy unchanged.</a></p> <script type="text/javascript" language="JavaScript1.2"> <!-- // Clear related topics // WWHClearRelatedTopics(); document.writeln(WWHRelatedTopicsInlineHTML()); // --> </script> </blockquote> <hr align="left" /> <!-- LSI changed location of company info to align left --> <!-- Added rol from 2011.3 pages.asp file --> <!-- LSI added copyright style --> <!-- --> <table align="left" role="presentation"> <!-- LSI added support for booknum and reldate --> <!-- --> <tr> <td class="copyright">DB09000202-21, Rev 2.2, July 2015</td> </tr> <tr> <td class="copyright"> <a href="http://www.lsi.com/Pages/trademark.aspx?" target="external_window">Copyright© 2015 by Avago Technologies. 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