111 lines
6.4 KiB
HTML
111 lines
6.4 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="How to use the shared, read-only storage space" />
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<meta name="abstract" content="Learn how to read data from a shared storage space." />
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<meta name="description" content="Learn how to read data from a shared storage space." />
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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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<!-- 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>How to use the shared, read-only storage space</title>
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</head>
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<body id="rzalmsharedreadonly"><a name="rzalmsharedreadonly"><!-- --></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">How to use the shared, read-only storage space</h1>
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<div><p>Learn how to read data from a shared storage space.</p>
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<div class="p"><p>Version 5 Release 2 added the ability for multiple Linux partitions
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to share virtual disks. Multiple partitions can now read data from a shared
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storage space concurrently. The ability to share virtual disks is useful whenever
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two or more Linux partitions need to use the same file. For example:</p>
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<ul><li>Two or more Linux partitions used as Web servers could point to the same
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Web page.</li>
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<li>Two or more Linux partitions could want to read documentation from the
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same file.</li>
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<li>Two or more Linux partitions could want to run the same copy of an Apache
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Web server program.</li>
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</ul>
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</div>
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<div class="section">To use the storage space, you must link to the virtual disk and provide
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users access. Use either of the following methods to use shared, read-only
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storage:</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 link 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 - Read</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>
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<div class="nested1" xml:lang="en-us" id="clcommand"><a name="clcommand"><!-- --></a><h2 class="topictitle2">Use the Add Network Server Storage Link command</h2>
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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 Add Network Server Storage Link (ADDNWSSTGL) command. </span> The storage link for virtual disks that Linux partitions are going to
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share concurrently must have an access type of read (*READ). <br /><img src="rzalm033.gif" alt="Add Network Server Storage Link display" /><br /><p>On the Add Network Server
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Storage Link (ADDNWSSTGL) display, the value you enter in the Dynamic storage
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link field can be either *YES or *NO. To display the Access option, press
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the F9 key. If multiple Linux partitions share disks, the partitions must
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access (that is, mount) the disks from Linux with read-only access.</p>
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</li>
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<li class="stepexpand"><span>You can specify that Linux has read-only access to the disk two
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ways:</span><ul><li>By using an option on the mount command</li>
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<li>By specifying read-only as a parameter in the /etc/fstab file</li>
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</ul>
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</li>
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</ol>
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<div class="example">The following is an example of the using the mount command to mount
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a file system as read-only:<blockquote><pre>mount -o ro /dev/hdb1 /mnt/data2</pre>
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</blockquote>
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<p>An
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entry in the /etc/fstab file to mount a disk resource as read-only would resemble
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the following:</p>
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<blockquote><pre>/dev/hdb1 /mnt/data ext2 ro 1 1</pre>
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</blockquote>
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</div>
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</div>
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<div class="nested2" xml:lang="en-us" id="update"><a name="update"><!-- --></a><h3 class="topictitle3">Update and provide users access</h3>
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<div><div class="section">To update a shared storage space and provide users access, follow
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these steps:</div>
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<ol><li><span>Give all users <kbd class="userinput">*SHRUPD</kbd> access to the storage
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space.</span></li>
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<li><span>Have all users open the storage space concurrently for read-only
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access.</span></li>
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<li><span>Have all users stop accessing the data on that storage space and
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close (unmount) that device from within Linux.</span></li>
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<li><span>Have one user open the device for read-write access, update the
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data, and close the device.</span></li>
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<li><span>Have all users reopen the device for read-only concurrent access.</span></li>
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</ol>
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<div class="section">Other restrictions:<ul><li>Version 5 Release 2 or later of i5/OS<sup>®</sup> is required, but it
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does not have to be in the primary partition.</li>
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<li>The maximum size supported for a storage space is 1000 GB.</li>
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<li>The maximum number of storage spaces supported is 64. However, while 64
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storage spaces may be linked to the server, only the first 20 storage spaces
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are visible to Linux, depending on the Linux distribution.</li>
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</ul>
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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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