77 lines
4.7 KiB
HTML
77 lines
4.7 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 name="DC.Type" content="topic" />
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<meta name="DC.Title" content="Disk storage concepts" />
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<meta name="copyright" content="(C) Copyright IBM Corporation 2002, 2006" />
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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>Disk storage concepts</title>
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</head>
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<body id="rzaix49"><a name="rzaix49"><!-- --></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">Disk storage concepts</h1>
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<div><p>Disk units are assigned to a disk pool on a storage unit basis. The system
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treats each storage unit within a disk unit as a separate unit of auxiliary
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storage. When a new disk unit is attached to the system, the system initially
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treats each storage unit within it as nonconfigured. You can <a href="rzalyadd.htm">add</a> these nonconfigured storage units to either the system
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disk pool, basic disk pool, or independent disk pool of your choosing. When
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adding nonconfigured storage units, use the serial number information that
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is assigned by the manufacturer to ensure that you are selecting the correct
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physical storage unit. Additionally, the individual storage units within the
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disk unit can be identified through the address information that can be obtained
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from the DST Display Disk Configuration display.</p>
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<p>When you add a nonconfigured storage unit to a disk pool, the system assigns
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a unit number to the storage unit. The unit number can be used instead of
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the serial number and address. The same unit number is used for a specific
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storage unit even if you connect the disk unit to the system in a different
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way.</p>
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<p>When a unit has mirrored protection, the two storage units of the mirrored
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pair are assigned the same unit number. The serial number and the address
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distinguish between the two storage units in a mirrored pair.</p>
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<p>To determine which physical disk unit is being identified with each unit
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number, make note of the unit number assignment to ensure correct identification.
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If a printer is available, print the display of your disk configuration. If
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you need to verify the unit number assignment, use iSeries™ Navigator to display disk unit
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properties and check the serial numbers and addresses of each unit.</p>
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<p>The storage unit that is addressed by the system as unit 1 is always used
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by the system to store licensed internal code and data areas. The amount of
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storage that is used on unit 1 is quite large and varies depending on the
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configuration of your system. Unit 1 contains a limited amount of user data.
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Because unit 1 contains the initial programs and data that are used during
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an IPL of the system, it is also known as the loadsource unit.</p>
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<p>The system reserves a fixed amount of storage on units other than unit
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1. The size of this reserved area is 1.08 MB per unit, reducing the space
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available on each unit by that amount.</p>
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</div>
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<div>
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<ul class="ullinks">
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<li class="ulchildlink"><strong><a href="rzalyxdskcfg.htm">Components of disk storage</a></strong><br />
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</li>
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<li class="ulchildlink"><strong><a href="rzalymultipath.htm">Considerations for multipath disk units</a></strong><br />
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</li>
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</ul>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="rzalydmconcepts.htm" title="Learn about how disk storage works, how you can leverage disk pools in your environment. Protect your data with device parity protection and mirrored protection.">Disk management concepts</a></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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