99 lines
6.8 KiB
HTML
99 lines
6.8 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.Title" content="Build a rescue image on an NWSSTG" />
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<meta name="abstract" content="One rescue solution for a logical partition is to create a small network storage space (NWSSTG) that can be left on the IFS solely for the purpose of rescuing logical partitions." />
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<title>Build a rescue image on an NWSSTG</title>
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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">Build a rescue image on an NWSSTG</h1>
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<div><p>One rescue solution for a logical partition is to create a small
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network storage space (NWSSTG) that can be left on the IFS solely for the
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purpose of rescuing logical partitions.</p>
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<p>First, a quick explanation of what a Linux Rescue server normally entails.
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Many distributors include a rescue image on their installation disks that
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will start into a minimal version of their distribution that contains all
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the basic diagnostic tools, drivers and other utilities that would be useful
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for checking a previously existing logical partition. You can simplify this
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process by creating a network storage space with a rescue server in it at
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the time you install your logical partition.</p>
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<p>Before creating a rescue image on network storage it is important to document
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the configuration information for each of your logical partitions. You will
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want to document the drive configuration which can be obtained from the /etc/fstab
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file. You will also want to capture the networking information that is reported
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when you run the command "<kbd class="userinput">ifconfig</kbd>". It
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would also be good to create a list of the modules that are needed by each
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partition. You can see which modules are in use by using the "<kbd class="userinput">lsmod</kbd>"
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command from within Linux. It is recommended that you take the information
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obtained from the commands and files listed above and put them into files
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that can be stored on your rescue network storage space.</p>
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<p>To create the rescue storage space, first consult your Linux documentation
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to see what amount of space is required for a minimum installation. Create
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a network storage space (CRTNWSSTG) that is slightly larger than the value
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listed in the distributor's documentation. For example if the documentation
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says a minimum server installation is 291 megabytes then you would want to
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create a storage space of 425 megabytes. Making the storage space larger allows
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space to create a swap partition, a PrEP start partition and allows room for
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you to install any extra software that you would like to have available in
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your rescue image. You may want to make a note in the storage space's description
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field telling what distribution was used to make the rescue image and warn
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that it should be saved. Next, link this storage space to a Network Storage
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Descriptor (NWSD). You don't need to create a new NWSD for this step. You
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could unlink an existing storage space and temporarily link your rescue storage
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space to any of your existing NWSD's. </p>
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<p>Next, start your distributor's installation server as described in the
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documentation and follow the prompts. Make sure that you create a PrEP start
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partition if you choose to manually partition your install. When you get to
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the distributors package group selection display you are going to want to
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select the minimum number of packages supported. The name for the package
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group varies by distribution. Finally, let the installer complete its package
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installation and configuration.</p>
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<p>After installation has finished, the installer will start up the server
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for you. At this time you should take some time to verify that the rescue
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server has all the utilities that you are going to need. For a logical partition,
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you are going to want to do an "<kbd class="userinput">rpm -qa | grep ibmsis</kbd>"
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to make sure that the utilities to work with native disk are available. You
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should also make sure that the device drivers (i.e., pcnet32 for Ethernet
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and Olympic for token ring) that your partitions may require are installed.
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The kernel modules that have been compiled can be found in the /lib/modules/kernel
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version/kernel/drivers directory structure. You should also install any other
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special drivers or software packages that your logical partitions may require
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and ftp the files with the configuration information for your other logical
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partitions onto the rescue server network storage space at this time.</p>
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<p>On some Linux Distributions, you will have to manually install the kernel
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after installation. Consult the appropriate installation documentation for
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details regarding installing the kernel.</p>
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<p>Since you will be starting the rescue network storage space from network
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storage you need to make note of the path to the root partition on the rescue
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storage space. You can determine the root partition by doing the command '<kbd class="userinput">cat
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/etc/fstab</kbd>'. The partition that has "/" in the second column is
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your root partition. The distributor's documentation should also provide assistance
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in determining the root partition.</p>
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<p>You are now done creating your rescue image. Shutdown your logical partition
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using "<kbd class="userinput">shutdown -h now</kbd>" and vary the partition off
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after the shutdown has completed. After the partition has varied off unlink
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the rescue storage space and relink the NWSD's normal storage space.</p>
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</div>
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</body>
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</html>
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