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<h1 class="topictitle1">Tape or tape libraries</h1>
<div><p>This topic includes requirements for tape devices or tape libraries.</p>
<div class="p">If you use tape for your installation, you need to determine which tape
unit to use for the alternate IPL. The tape unit for
the alternate IPL is either an internal or an external tape unit attached
to a storage IOA on system bus 1. If you have only one tape unit, use it as
the tape unit for the alternate IPL. If you do not know which tape unit to
use, contact your marketing representative or authorized service provider.<div class="note"><span class="notetitle">Note:</span> You can use a tape image catalog and a virtual tape device to install
PTF fixes or to install single licensed programs. You cannot use virtual tape
to install or upgrade an <span class="keyword">i5/OS™</span> release. </div>
</div>
<p>To help prevent media errors, be sure to clean the heads on your alternate
IPL tape drive before you begin the installation process. Refer to your tape
drive reference guide if you need more information on how to clean the heads.
If you receive a media error message during your installation process, see <a href="rzahctroubleshoot.htm#rzahctroubleshoot">Troubleshooting software installation problems</a> for recovery information.</p>
<p><strong>Sharing a tape device</strong></p>
<p>If you have an alternate installation tape device that you are sharing,
make sure other users do not assign or try to use the tape drive during the
installation because the installation process might fail.</p>
<p><strong>Setting up your tape library for installation</strong></p>
<p>When you install a release using a tape library device, do not use the
device in library mode or random mode. The 3494 tape library should use standalone
mode. <span>The 3490 and 35xx</span> tape libraries should use either automatic,
sequential, or manual mode. Refer to the operator's guide for the media library
device for information on setting up and using the correct mode.</p>
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<div class="familylinks">
<div class="parentlink"><strong>Parent topic:</strong> <a href="installdevicemedia.htm" title="Use this information to find out about the devices and media used for upgrades or installations.">Installation devices and media</a></div>
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