94 lines
6.0 KiB
HTML
94 lines
6.0 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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<meta name="DC.Type" content="task" />
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<meta name="DC.Title" content="Recovering directly attached disks" />
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<meta name="abstract" content="Read to learn how to recover directly attached disks." />
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<meta name="description" content="Read to learn how to recover directly attached disks." />
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<title>Recovering directly attached disks</title>
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<body id="rzalmbootpartition"><a name="rzalmbootpartition"><!-- --></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">Recovering directly attached disks</h1>
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<div><p>Read to learn how to recover directly attached disks.</p>
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<div class="p">When you install Linux in a logical partition with directly attached
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disk resources, the kernel is loaded to the A and B slots, not to *NWSSTG.
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When you recover a Linux partition in this configuration (for example, when
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you recover primary partition configuration data after you scratch the primary
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partition), you must change the network server description of the Linux partition
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in order to start from a kernel in the integrated file system (*STMF). After
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you start the partition, you can use Linux commands to rewrite the Linux kernel
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and enable the partition to be startable.</div>
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<div class="section">To start a Linux partition on a directly attached disk and then write
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the kernel so that you can start the system on subsequent re-starts, follow
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these steps:</div>
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<ol><li class="stepexpand"><span>Load a kernel in your integrated file system.</span></li>
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<li class="stepexpand"><span>Run the Work with Configuration Status (WRKCFGSTS) command, and
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specify network server (*NWS) as the configuration type. </span> A
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list of network server descriptions appears.</li>
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<li class="stepexpand"><span>Type <span class="uicontrol">8</span> to display the description in the
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Option column next to the Linux partition you want to start. </span> A
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description of that network server appears.</li>
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<li class="stepexpand"><span>Type <span class="uicontrol">2</span> to edit in the Option column next
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to Start source, Start stream file, and Start parameters.</span></li>
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<li class="stepexpand"><span>Edit those fields so that they contain the following values:</span><ul><li>IPL source = *STMF</li>
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<li>IPL stream file = <kbd class="userinput"><var class="varname"><IFS path to your kernel></var></kbd>,
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(for example, <kbd class="userinput">/home/kernels/vmlinux64</kbd>)</li>
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<li>IPL parameters = <kbd class="userinput">root=/dev/sda<var class="varname">X</var></kbd>,
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where <kbd class="userinput"><var class="varname">X</var></kbd> is equal to the disk partition
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that your root file system is on. This is often sda1 or sda2.</li>
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</ul>
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</li>
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<li class="stepexpand"><span>Save these changes.</span></li>
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<li class="stepexpand"><span>Connect to the virtual console. Enter <kbd class="userinput">telnet <var class="varname"><your
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machine></var> 2301</kbd>.</span></li>
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<li class="stepexpand"><span>Vary on the partition.</span></li>
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<li class="stepexpand"><span>Log in to the partition.</span></li>
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<li class="stepexpand"><span>If your server does not have a copy of the kernel that you want
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to install, FTP it on to your server. You could even NFS share it off of the i5/OS<sup>®</sup>.</span></li>
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<li class="stepexpand"><span>Write the kernel to your B slot by using the following command:
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</span> <pre>dd if <var class="varname"><path to your kernel name></var> = of=/proc/iSeries/mf/B/vmlinux bs=4096</pre>
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This
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command may take a while to complete.</li>
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<li class="stepexpand"><span>Set the command line to the same value you used for the Start parameters
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above. First, you may want to echo a large amount of space into the cmdline
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file to make sure that any previous parameters are cleared. To do so, use
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the following command: </span> <pre>echo root=/dev/sdax > /proc/iSeries/mf/B/cmdline</pre>
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</li>
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<li class="stepexpand"><span>Echo your command line: </span> <pre>echo root=/dev/sdaX > /proc/iSeries/mf/B/cmdline </pre>
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</li>
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<li class="stepexpand"><span>Verify that the command line was successfully entered by using
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the following command: </span> <pre>cat /proc/iSeries/mf/B/cmdline</pre>
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You
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should see the same thing you echoed in above.</li>
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<li class="stepexpand"><span>Shut down the partition by using the following command: </span> <pre>shutdown -h now</pre>
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</li>
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<li class="stepexpand"><span>Edit your network server description by using the Work with Configuration
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Status (WRKCFGSTS) command as described in steps 2 and 3 above.</span></li>
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<li class="stepexpand"><span>Set the Start source = <kbd class="userinput">B</kbd> and the Start stream
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file = <kbd class="userinput">*NONE</kbd>.</span></li>
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<li class="stepexpand"><span>Now you can vary on your partition and use the kernel installed
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in the iSeries™ server
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slot B.</span></li>
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</ol>
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</div>
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</body>
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</html>
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