84 lines
5.3 KiB
HTML
84 lines
5.3 KiB
HTML
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<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE html
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PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html lang="en-us" xml:lang="en-us">
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
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<meta name="DC.Type" content="task" />
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<meta name="DC.Title" content="Sharing access to disks in read-write mode" />
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<meta name="abstract" content="Learn how to share access to disks in read-write mode." />
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<meta name="description" content="Learn how to share access to disks in read-write mode." />
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<meta name="copyright" content="(C) Copyright IBM Corporation 1998, 2006" />
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<meta name="DC.Rights.Owner" content="(C) Copyright IBM Corporation 1998, 2006" />
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<meta name="DC.Format" content="XHTML" />
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<meta name="DC.Identifier" content="rzalmreadwrite" />
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<meta name="DC.Language" content="en-us" />
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<!-- All rights reserved. Licensed Materials Property of IBM -->
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<!-- US Government Users Restricted Rights -->
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<!-- Use, duplication or disclosure restricted by -->
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<!-- GSA ADP Schedule Contract with IBM Corp. -->
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<link rel="stylesheet" type="text/css" href="./ibmdita.css" />
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<link rel="stylesheet" type="text/css" href="./ic.css" />
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<title>Sharing access to disks in read-write mode</title>
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</head>
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<body id="rzalmreadwrite"><a name="rzalmreadwrite"><!-- --></a>
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<!-- Java sync-link --><script language="Javascript" src="../rzahg/synch.js" type="text/javascript"></script>
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<h1 class="topictitle1">Sharing access to disks in read-write mode</h1>
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<div><p>Learn how to share access to disks in read-write mode.</p>
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<div class="p">Although simultaneous access to a virtual disk by multiple logical
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partitions is limited to read-only access, V5R2 enhancements make it possible
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for multiple logical partitions to have the same virtual disk linked to their
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network storage descriptor (NWSD). However, only one partition can access
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the disk in read-write mode at any given time. See <a href="rzalmsharedreadonly.htm">How to use the shared, read-only storage space</a> for more information.</div>
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<div class="section">Use either of the following methods to access disks in read-write
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mode:</div>
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</div>
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<div class="nested1" xml:lang="en-us" id="inav"><a name="inav"><!-- --></a><h2 class="topictitle2">Use the iSeries Navigator</h2>
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<div><div class="section">To access a disk drive using iSeries™ Navigator, follow these steps:</div>
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<ol><li><span>Click <span class="menucascade"><span class="uicontrol">Network</span></span><span class="menucascade"><span class="uicontrol">Windows Administration</span></span><span class="menucascade"><span class="uicontrol">Disk
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Drives</span></span>.</span></li>
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<li><span>Right-click an available disk drive and select <span class="uicontrol">Add Link</span>.</span></li>
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<li><span>Select the server that you want to link the disk to.</span></li>
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<li><span>Select one of the available link types and the link sequence position.</span></li>
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<li><span>Select the <span class="uicontrol">Shared - Update</span> access type.</span></li>
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<li><span>Click <span class="uicontrol">OK</span>.</span></li>
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</ol>
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</div>
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<div class="nested2" xml:lang="en-us" id="clcommand"><a name="clcommand"><!-- --></a><h3 class="topictitle3">Use the Add Network Server Storage Link command</h3>
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<div><div class="section">To link a disk drive using the Add Network Server Storage Link command,
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follow these instructions:</div>
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<ol><li class="stepexpand"><span>Type the the Add Network Server Storage Link (ADDNWSSTGL) command.</span> This command links the network storage space to the network server descriptor.
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You must set the access type to shared update (<kbd class="userinput">*SHRUPD</kbd>). <br /><img src="rzalm032.jpg" alt="Add Network Server Storage Link display" /><br /></li>
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<li class="stepexpand"><span>Specify either <kbd class="userinput">*YES</kbd> or <kbd class="userinput">*NO</kbd> in
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the Dynamic storage link field.</span></li>
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<li class="stepexpand"><span>Press the <span class="uicontrol">F9</span> key to display the Access field.</span></li>
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</ol>
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<div class="example">After you link the network storage to the partition, Linux can access
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the storage by using the mount command. For example, to mount a virtual disk
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in read-write mode, you could use the following mount command:<blockquote><pre>mount /dev/hdb1 /mnt/data2 </pre>
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</blockquote>
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<p>If
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no other partition has the disk mounted, the mount is successful. Otherwise,
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Linux generates the following error:</p>
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<blockquote><pre>mount: /dev/hdb5: can't read superblock</pre>
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</blockquote>
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<p>In
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order to grant access to the partition, the first partition (that is, the
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partition that is currently accessing the resource) must first relinquish
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access. To accomplish this result, use the Linux <kbd class="userinput">umount</kbd> command
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as follows:</p>
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<blockquote><pre>umount /dev/hdb1</pre>
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</blockquote>
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<p>After the
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first Linux partition relinquishes the resource, the second Linux partition
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can mount and access it.</p>
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</div>
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</div>
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</div>
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</div>
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</body>
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</html>
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