96 lines
6.1 KiB
HTML
96 lines
6.1 KiB
HTML
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<meta name="DC.Type" content="concept" />
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<meta name="DC.Title" content="Complete Backup Range" />
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<meta name="abstract" content="When an optical *PRIMARY volume to copied to an optical *BACKUP volume a special file called a Complete Backup Range is written to the *BACKUP volume." />
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<title>Complete Backup Range</title>
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</head>
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<body id="rzam4compbackuprange"><a name="rzam4compbackuprange"><!-- --></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">Complete Backup Range</h1>
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<div><p>When an optical *PRIMARY volume to copied to an optical *BACKUP
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volume a special file called a Complete Backup Range is written to the *BACKUP
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volume.</p>
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<p>This file indicates the last time a backup was done. The system keeps backup
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control information for the volume as well as each directory on the volume.
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If the volume or directory was successfully backed up the Complete Backup
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Range will contain both a starting and ending date and time. When a range
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exists for an optical backup volume or directory, it has a specific meaning:
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The backup directory or volume has a copy of all the created or changed files
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within the date range that correspond to the primary directory or volume.</p>
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<div class="p">For example, volume BVOL1 is an optical *BACKUP volume for *PRIMARY volume
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PVOL1. BVOL1 contains directory /DIR1 that has a Complete Backup Range as
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follows:<ul><li>Start Date: 1/1/99</li>
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<li>Start Time: 09:00:00</li>
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<li>End Date: 1/30/99</li>
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<li>End Time: 22:00:00 </li>
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</ul>
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</div>
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<p>This means that the system backe up all the changed or created files in
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/DIR1 on PVOL1 since 9:00 a.m. on 1 January 1999. The system backed up files
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to /DIR1 on BVOL1 at 10:00 p.m. on 30 January 1999. Any files that were created
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or changed on *PRIMARY volume PVOL1 in directory /DIR1 after 22:00:00 on 1/30/99
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would not yet have been backed up.</p>
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<p><strong>Complete Backup Range for Directories: </strong>The Complete Backup Range
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for a directory does not encompass all subdirectories of the directory. In
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other words, each directory has its own unique Complete Backup Range. For
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example, assume that directory /A has a Complete Backup Range of 1 March 1999
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through 1 May 1999. This does not necessarily mean that directory /A/B has
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the same complete range. In fact, /A/B might have no Complete Backup Range
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at all. The complete range does not reflect a hierarchical range over all
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directories within that subtree.</p>
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<div class="p">The system updates the Complete Backup Range for a backup directory after
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it copies all eligible files in the primary directory.<div class="note"><span class="notetitle">Note:</span> Note: Use the
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SLTFILE parameter on the CPYOPT command to determine if a file is eligible.
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If you use *ALL, all files are eligible to copy. If you use *CHANGED, only
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those files that were created or changed since the last CPYOPT command are
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eligible. If you specified *NEW, the system copies files only if they do not
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exist on the target volume.</div>
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</div>
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<p>For example, FILE.001 gets copied on 1 March 1999 as a result of a complete
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backup of directory /DIR1. At this time /DIR1 is given an ending range of
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1 March 1999. On 1 April 1999, the user has the system back up directory /DIR1
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again by specifying SLTFILE(*CHANGED). However, the back up affects only the
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files that have changed. If FILE.001 has not changed since the previous CPYOPT
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command, this file is not eligible to copy. However, the system updates the
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ending range for /DIR1 to 1 April 1999 if none of the eligible files fail
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to copy.</p>
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<p><strong>Complete Backup Range for Optical Volumes:</strong> The Complete Backup Range
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for an optical volume is very similar to that of an optical directory. The
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complete range for a directory represents the relationship between the files
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in a backup directory and those in the primary directory. Likewise, the complete
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range for an optical backup volume represents the relationship between the
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files on an optical backup volume and those on the primary volume. You must
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back up all eligible files on a volume to update the complete range of the
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volume.</p>
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<p>You can update the complete range for a volume only if the
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CPYOPT command specifies the FROMPATH(/) and CPYSUBDIR(*YES) variables. This
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ensures that the system will process all files on the *PRIMARY volume.</p>
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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="rzam4volumetypebackup.htm" title="This section discusses the *BACKUP volume type and the unique backup process that are associated with a *BACKUP volume.">Volume type *BACKUP</a></div>
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</div>
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</div>
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