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<title>Independent disk pool terminology</title>
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<body id="rzalyterminology"><a name="rzalyterminology"><!-- --></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">Independent disk pool terminology</h1>
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<div><p>As you work with independent disk pools, you need to become familiar with
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the following terms. For more terms and concepts, you can access the information
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center <a href="../rzaat/as4glos.htm">glossary</a>. </p>
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<p><span class="uicontrol">Important:</span> The terms <span class="uicontrol">independent auxiliary
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storage pool (ASP)</span> and <span class="uicontrol">independent disk pool</span> are
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synonymous.</p>
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<dl><dt class="dlterm">active state</dt>
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<dd>In geographic mirroring, pertaining to
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the configuration state of a mirror copy that indicates geographic mirroring
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is being performed if the disk pool is available.</dd>
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<dt class="dlterm">asynchronous</dt>
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<dd>In geographic mirroring, pertaining to the mode where the program issuing
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the update waits until the operation is completed on the production copy and
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received for processing on the target system.</dd>
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<dt class="dlterm"><strong>cluster</strong></dt>
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<dd>A collection of complete systems that work together to provide a single,
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unified computing capability. An iSeries™ cluster is made up of only iSeries servers
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and is required when implementing switchable independent disk pools.</dd>
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<dt class="dlterm"><strong>cluster resource group (CRG)</strong></dt>
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<dd>A collection of related cluster resources that defines actions to be taken
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during a switchover or failover operation of the access point of resilient
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resources. These resilient resources include applications, data, and devices.
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The group describes a recovery domain and supplies the name of the cluster
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resource group exit program that manages the movement of an access point.
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A device CRG contains a list of devices, such as independent disk pools.
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The independent disk pools can reside on a switchable entity that can be either
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an expansion unit (frame/unit) or an IOP. In iSeries Navigator, a device cluster resource
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group is referred to as a switchable hardware group. </dd>
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<dt class="dlterm">cross-site mirroring (XSM)</dt>
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<dd>A feature of i5/OS™ High Available Switchable Resources
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(Option 41) that provides geographic mirroring and the services to switch
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over or automatically cause a failover to a mirror copy, potentially at another
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location, in the event of an outage at the primary location.</dd>
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<dt class="dlterm">data port services</dt>
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<dd>The generic transport mechanism used by geographic mirroring to send updates
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from the source system that owns the production copy to the target system
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that owns the mirror copy.</dd>
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<dt class="dlterm">detach</dt>
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<dd>In geographic mirroring, to disassociate a mirror copy from the production
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copy in order to use the mirror copy for a separate operation, such as to
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save data, to run reports, or to perform data mining. Detaching a mirror
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copy suspends geographic mirroring.</dd>
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<dt class="dlterm">detached mirror copy</dt>
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<dd>A detached mirror copy of an independent
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disk pool is a mirror copy that is disassociated from the production copy
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in a geographic mirroring environment.</dd>
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<dt class="dlterm"><strong>device description</strong></dt>
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<dd>An object that contains information describing a particular device or
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logical unit (LU) that is attached to the system. A device description is
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a description of the logical connection between two LUs (local and remote
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locations). The system-recognized identifier for the object type is *DEVD. </dd>
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<dt class="dlterm"><strong>device domain</strong></dt>
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<dd>A device domain is a collection of cluster nodes that share device resources,
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such as independent disk pools. For independent disk pools, the resources
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are: virtual addresses, disk pool numbers and disk unit numbers. An independent
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disk pool can only be accessed by the nodes in one device domain. </dd>
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<dt class="dlterm"><strong>disk pool</strong> </dt>
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<dd>An auxiliary storage pool that contains only disk units.</dd>
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<dt class="dlterm"><strong>disk pool group</strong></dt>
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<dd>Made up of a primary disk pool and zero or more secondary disk pools,
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each of which are independent in regard to data storage, but combine to act
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as one entity.</dd>
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<dt class="dlterm"><strong>disk unit</strong> </dt>
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<dd>A physical enclosure containing one or more disk drives. </dd>
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<dt class="dlterm"><strong>expansion unit</strong></dt>
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<dd>A feature that can be connected to a system unit to provide additional
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storage and processing capacity.</dd>
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<dt class="dlterm"><strong>failover</strong> </dt>
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<dd>A cluster event where the primary database server or application server
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switches over to a backup system due to the failure of the primary server</dd>
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<dt class="dlterm">geographic mirroring</dt>
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<dd>A subfunction of cross-site mirroring (XSM) that generates a mirror image
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of an independent disk pool on a system, which is (optionally) geographically
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distant from the originating site for availability or protection purposes.</dd>
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<dt class="dlterm"><strong>HSL (high-speed link) loop</strong></dt>
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<dd>The system-to-expansion unit connectivity technology that is required
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to use switchable independent disk pools residing on an expansion unit (frame/unit).
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The servers and expansion unit in a cluster using resilient devices on an
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external expansion unit must be on an HSL loop connected with HSL cables.</dd>
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<dt class="dlterm"><strong>independent disk pool</strong> </dt>
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<dd>Disk pools 33 to 255. One or more storage units that are defined from
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the disk units or disk-unit subsystems that make up addressable disk storage.
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An independent disk pool contains objects, the directories and libraries that
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contain the objects, and other object attributes such as authorization ownership
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attributes. An independent disk pool can be made available (varied on) and
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made unavailable (varied off) without restarting the system. An independent
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disk pool can be either a) privately connected to a single system b) switchable
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among multiple systems in a clustering environment or c) duplicated at another
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site by geographic mirroring. Synonymous with <em>independent auxiliary storage
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pool (ASP)</em>.</dd>
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<dt class="dlterm">insync</dt>
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<dd>In geographic mirroring, pertaining to the mirror copy data state that
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indicates that the production and mirror copy have exactly the same contents.</dd>
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<dt class="dlterm"><strong>library namespace</strong></dt>
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<dd>An attribute that can be set for the current thread. The library namespace
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is the set of objects and libraries that can be accessed in any independent
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disk pools in a disk pool group plus the libraries in the system disk pool
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and basic user disk pools (ASPs 2-32) using the regular library-qualified
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object name syntax. The Set Auxiliary Storage Pool Group (SETASPGRP) command
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sets the auxiliary storage pool (ASP) group for the current thread. </dd>
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<dt class="dlterm">mirror copy</dt>
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<dd>In geographic mirroring, an independent disk pool that is being geographically
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mirrored so that it is a replica of the production copy of the independent
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disk pool. If a switchover or failover causes the system that owns the mirror
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copy to become the current primary node, the mirror copy becomes the production
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copy of the independent disk pool. The mirror copy has current data only when
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geographic mirroring is active.</dd>
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<dt class="dlterm">mirror copy state</dt>
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<dd>In geographic mirroring, the geographic mirroring state of the mirror
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copy; for example, active, resume pending, resuming, and suspended.</dd>
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<dt class="dlterm">mirror copy data state</dt>
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<dd>In geographic mirroring, the current status of the data that is being
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geographically mirrored; for example, insync, usable, and unusable.</dd>
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<dt class="dlterm"><strong>primary disk pool</strong></dt>
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<dd>An independent disk pool that defines a collection of directories and
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libraries and may have other secondary disk pools associated with it. A primary
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disk pool also defines a database for itself and other disk pools that may
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be added in its disk pool group. Primary disk pools can only be implemented
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on V5R2 or later of OS/400<sup>®</sup>. </dd>
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<dt class="dlterm">production copy</dt>
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<dd>In geographic mirroring, the independent disk pool to which all production
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operations are directed. All disk write operations are directed here first
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and are then replicated to the mirror copy of the independent disk pool. The
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production copy always has current data.</dd>
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<dt class="dlterm">reattach</dt>
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<dd>In geographic mirroring, to reassociate
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the detached mirror copy with its production copy after user operations on
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the detached mirror copy are completed. When the detached mirror copy is reattached,
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it is automatically synchronized to match the production copy again. All data
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on the detached mirror copy is cleared before it is reattached to the production
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copy.</dd>
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<dt class="dlterm">resume </dt>
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<dd>In geographic mirroring, to start performing
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geographic mirroring again after it is suspended.</dd>
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<dt class="dlterm">resume pending state</dt>
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<dd>In geographic mirroring, pertaining to
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the configuration state of a mirror copy that indicates that geographic mirroring
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requires synchronization but that the disk pool is currently unavailable.
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When the disk pool is made available, the mirror copy will be synchronized
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with the current data from the production copy.</dd>
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<dt class="dlterm">resuming state</dt>
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<dd>In geographic mirroring, the configuration state of the mirror copy that
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attempts to perform geographic mirroring and synchronization when the independent
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disk pool is available. The mirror copy state is resuming when it is not
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suspended or active.</dd>
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<dt class="dlterm"><strong>secondary disk pool</strong></dt>
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<dd>An independent disk pool that defines a collection of directories and
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libraries and must be associated with a primary disk pool. Secondary disk
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pools can only be implemented on V5R2 or later of OS/400. See </dd>
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<dt class="dlterm">site</dt>
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<dd>In cross-site mirroring, a location containing a node or nodes with access
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to either the production copy or mirror copy. The sites can be in close proximity
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or geographically dispersed.</dd>
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<dt class="dlterm"><a name="rzalyterminology__v5r3"><!-- --></a>site primary node</dt>
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<dd>In cross-site mirroring, a node that owns the independent disk pool, either
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the production copy or mirror copy, at a particular site. The production-site
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primary node is also the primary node for the cluster resource group. The
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mirror-site primary node is a backup node in a cluster resource group.</dd>
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<dt class="dlterm">source system</dt>
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<dd>The system that currently owns the production
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copy of an independent disk pool in a cross-site mirroring (XSM) environment.
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The target system is a backup node in the cluster resource group and is the
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mirror site primary node. Changes to the production copy of an independent
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disk pool are replicated to the mirror copy of the independent disk pool that
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exist on a backup node within the recovery domain.</dd>
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<dt class="dlterm">suspend</dt>
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<dd>In geographic mirroring, to temporarily
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stop performing geographic mirroring. If the mirror copy contained usable
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data when suspended, the mirror copy still contains usable, though possibly
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outdated, data.</dd>
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<dt class="dlterm">suspended state</dt>
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<dd>In geographic mirroring, pertaining to the configuration state of the
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mirror copy that does not attempt to perform geographic mirroring when the
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independent disk pool is available. The mirror copy state is suspended when
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it is not resuming or active.</dd>
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<dt class="dlterm"><strong>switchable entity</strong></dt>
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<dd>The physical resource containing the independent disk pools that can be
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switched between systems in a cluster. This can be a expansion unit containing
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disk units in a multiple system environment. This might also be an IOP containing
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disk units in an LPAR environment. </dd>
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<dt class="dlterm"><strong>switchover</strong></dt>
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<dd>A cluster event where the primary database server or application server
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switches over to a backup system due to the manual intervention from the
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cluster management interface. </dd>
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<dt class="dlterm"><img src="./delta.gif" alt="Start of change" />full synchronization<img src="./deltaend.gif" alt="End of change" /></dt>
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<dd><img src="./delta.gif" alt="Start of change" />The geographic mirroring processing that copies data from the production
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copy to the mirror copy. During synchronization the mirror copy contains
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unusable data. When synchronization is completed, the mirror copy contains
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usable data.<img src="./deltaend.gif" alt="End of change" /></dd>
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<dt class="dlterm"><img src="./delta.gif" alt="Start of change" />partial synchronization<img src="./deltaend.gif" alt="End of change" /></dt>
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<dd><img src="./delta.gif" alt="Start of change" />While the system is in a suspended state, changes made to the production
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copy are not sent to the mirror copy. If the production copy is suspended
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with tracking, any changes made to the production copy are instead tracked.
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Once geographic mirror is resumed and partial synchronization is started,
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those tracked changes are then sent to the mirror copy.<img src="./deltaend.gif" alt="End of change" /></dd>
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<dt class="dlterm">synchronous</dt>
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<dd>In geographic mirroring, pertaining to the mode of geographic mirroring
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where the program that issues the update waits until the operation is completed
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to disk on both the production copy and the mirror copy. This mode ensures
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that once control is returned to the client, the operation is accurately reflected
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on both the production copy and the mirror copy.</dd>
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<dt class="dlterm"><strong>SYSBAS</strong></dt>
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<dd>In the character-based interface, refers to the system disk pool 1 and
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all configured basic disk pools 2 through 32. Independent disk pools 33 through
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255 are not included.</dd>
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<dt class="dlterm">target system</dt>
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<dd>A system that currently owns a mirror copy of an independent ASP in a
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cross-site mirroring (XSM) environment. Changes to the production copy of
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an independent disk pool on the source system are replicated to the mirror
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copy of the independent disk pool that exists on a target system.</dd>
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<dt class="dlterm"><img src="./delta.gif" alt="Start of change" />tracking<img src="./deltaend.gif" alt="End of change" /></dt>
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<dd><img src="./delta.gif" alt="Start of change" />A process that remembers changes that occur while geographic mirroring
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is suspended. When geographic mirroring resumes the system only synchronizes
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the tracked changes and does not perform a full synchronization.<img src="./deltaend.gif" alt="End of change" /></dd>
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<dt class="dlterm"><strong>UDFS disk pool</strong></dt>
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<dd> An independent disk pool that contains only user-defined file systems.
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It cannot be a member of a disk pool group unless it is converted to a primary
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or secondary disk pool.</dd>
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<dt class="dlterm">unusable</dt>
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<dd>In geographic mirroring, pertaining to the mirror copy data state that
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indicates that the mirror copy contains incoherent data. This occurs: <ol><li>During synchronization because synchronization does not preserve the order
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of writes.</li>
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<li>When the system performs geographic mirroring in asynchronous mode.</li>
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</ol>
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<div class="note"><span class="notetitle">Note:</span> <img src="./delta.gif" alt="Start of change" />The mirror copy becomes usable during a vary-off of
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the production copy of the independent disk pool.<img src="./deltaend.gif" alt="End of change" /></div>
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</dd>
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<dt class="dlterm">usable</dt>
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<dd>In geographic mirroring, pertaining to the mirror copy data state that
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indicates that the correct order of updates to the mirror copy from the production
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copy is being preserved, but the mirror copy may be outdated. The usable mirror
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copy data state occurs: <ol><li>When the system performs geographic mirroring in synchronous mode.</li>
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<li>After successfully suspending geographic mirroring.</li>
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<li>When mirror copy is successfully detached.</li>
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</ol>
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<div class="note"><span class="notetitle">Note:</span> <img src="./delta.gif" alt="Start of change" /><ol><li>The mirror copy becomes usable during a vary-off of the production copy
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of the independent disk pool.</li>
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<li>Number 1 and 2 do not apply during a synchronization.</li>
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</ol>
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<img src="./deltaend.gif" alt="End of change" /></div>
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</dd>
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<dt class="dlterm"> <strong>vary off</strong></dt>
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<dd> To make an independent disk pool unavailable for its normal, intended
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use. All of the primary and secondary disk pools in a disk pool group will
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vary off together. Synonymous with <em>make unavailable</em>. </dd>
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<dt class="dlterm"><strong>vary on</strong> </dt>
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<dd>To make an independent disk pool available for its normal, intended use.
|
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All of the primary and secondary disk pools in a disk pool group are varied
|
||
|
|
on together. Synonymous with <em>make available</em>. </dd>
|
||
|
|
</dl>
|
||
|
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</div>
|
||
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<div>
|
||
|
|
<div class="familylinks">
|
||
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|
<div class="parentlink"><strong>Parent topic:</strong> <a href="rzalyconcepts.htm">Independent disk pools</a></div>
|
||
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|
</div>
|
||
|
|
<div class="relinfo"><strong>Related information</strong><br />
|
||
|
|
<div><a href="rzalyiasptypes.htm">Types of disk pools</a></div>
|
||
|
|
<div><a href="rzalydiskpoolgroups.htm">Disk pool groups</a></div>
|
||
|
|
</div>
|
||
|
|
</div>
|
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</body>
|
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</html>
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