89 lines
5.8 KiB
HTML
89 lines
5.8 KiB
HTML
<?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="reference" />
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<meta name="DC.Title" content="Scenario: LAN connected devices only with take over enabled" />
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<meta name="abstract" content="This is a description of what happens during an IPL when console take over is enabled and more than one LAN-connected device is available." />
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<meta name="description" content="This is a description of what happens during an IPL when console take over is enabled and more than one LAN-connected device is available." />
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<link rel="stylesheet" type="text/css" href="./ibmdita.css" />
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<title>Scenario: LAN connected devices only with take over enabled</title>
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</head>
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<body id="scenariotakeover1"><a name="scenariotakeover1"><!-- --></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">Scenario: LAN connected devices only with take over enabled</h1>
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<div><p>This is a description of what happens during an IPL when console
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take over is enabled and more than one LAN-connected device is available.</p>
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<div class="section"><p>The LAN devices will be called LAN1, LAN2, and LAN3. The IPL
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is being performed in unattended (Normal) mode.</p>
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<p>At the point in an IPL
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when the console device is being determined, it is more or less a race condition
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if more than one device is connecting at a time. The first device to connect,
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of the type specified by the console mode setting (LAN in our example), becomes
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the console and will be presented with the usual console screens.</p>
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</div>
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<div class="section"><p>For our example let's say LAN1 is the first device connected.
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During the IPL this device will show the IPL status changes just like any
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other console and eventually the <span class="keyword">i5/OS™</span> sign
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on window. LAN2 and LAN3 will show a special DST signon screen with a new
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line of data stating <tt class="sysout">ATTENTION: This device can become the
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console</tt>. The rest of the window will be the same as any other
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DST signon window. At LAN2 a user with the user privilege of take over console
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signs on. This user will now be presented the same <tt class="sysout">Console
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Information Status</tt> screen and the take over the console
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field will show a <tt class="sysout">YES</tt> indicating that take over
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is possible. At LAN3 a user without the take over console privilege signs
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on. The take over the console field will show as <tt class="sysout">NO</tt> since
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the user does not have the correct authority for take over.</p>
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</div>
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<div class="section"><p>At this point only one device has met all the conditions for a
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console take over. At the bottom of the screen is F10=Take over console connection.
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Pressing F10 will present the user with the Take over Console Connection
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From Another User screen. This is a confirmation screen that gives the user
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a last chance to cancel the take over. Selecting 1 and then pressing Enter
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at this point will cause the take over to occur. Almost immediately, LAN1
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will get the special DST signon screen and LAN2, the device that initiated
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the take over, will have the exact same screen LAN1 had when the transfer
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took place. The job, if something was running, doesn't even know this action
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took place. In fact, the original console could have been installing Licensed
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Internal Code or <span class="keyword">i5/OS</span> or
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even running a complete system save in restricted state and the server would
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not know it. You could even disconnect the console connection and come back
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later, reconnect, and you will get the current job's screen data and the job
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would never miss a beat. If a large amount of screen data was sent by the
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job and could not be delivered, the data will be stored until later. When
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a console reconnects, by an authorized user (has the take over console privilege)
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from an eligible device, the user may see fast screen refreshes until all
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the stored data has been delivered. Actually, doing a disconnect and a reconnect
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is considered a recovery (not a take over).</p>
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</div>
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<div class="section"><p>The data present at LAN3 will not change after the take over.
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Currently, there is no method to automatically refresh the data. However,
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if the user at LAN3 pressed Enter, a manual refresh of all fields except the
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Take over the console field would occur. The user would have to exit this
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screen and sign on again to see the change to that field.</p>
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</div>
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</div>
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<div>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="rzajrconsolescenarios.htm" title="The following scenarios will help you understand the take over and recovery options.">Scenarios</a></div>
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</div>
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</div>
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</body>
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</html> |