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==PTF installation==
{{
{{expand section|Maintenance vehicles for other platforms|talk=Service cycle|date=August 2021}}
Initially, installations had to install service via a semi-manual process.<ref>{{cite
| title = IBM System/360 Operating System - Maintenance Program
| id = C27-6918
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</ref>
Over time, IBM started to provide service aids such as IMAPTFLE<ref>{{cite
| title = IBM System/360 Operating System: Service Aids - OS Release 21
| id = GC28-6719-2
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}}
</ref>
and utilities such as IEBEDIT<ref>{{cite
| title = IBM System/360 Operating System - Utilities
| id = GC28-6586-11
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{{abbreviations|section|HA|date=January 2023}}
{{expand section|Maintenance vehicles for other platforms, alternate methodologies|talk=Service cycle|date=August 2021}}
PTFs used to be distributed in a group on a so-called ''Program Update Tape'' (''PUT'') or ''Recommended Service Upgrade'' (''RSU''), approximately on a monthly basis. They can now be downloaded straight to the system through a direct connection to IBM support. In some instances IBM will release a "Cumulative PTF Pack", a large number of fixes which function best as a whole, and are sometimes codependent. When this happens, IBM issues compact discs containing the entire PTF pack, which can be loaded directly onto the system from its media drive.
One reason for the use of physical media is size, and related (default) size limits. "By default, the /home file system on VIOS (Virtual I/O Server<ref>{{cite web |last1=IBM Corporation |title=Virtual I/O Server overview |url=https://www.ibm.com/support/knowledgecenter/TI0003M/p8hb1/p8hb1_vios_virtualioserveroverview.htm |website=IBM Knowledge Center |accessdate=Oct 14, 2019}}</ref>) for [[IBM System p|System p]] is only 10GB in size."<ref name=TecTip>{{cite web |title=Populating the VIOS Virtual Media Repository
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# Download the most recent HOLDDATA
# ''RECEIVE'' (load) the service and HOLDDATA to the ''Consolidated Software Inventory'' (''CSI'')
# ''APPLY CHECK'' the service and HOLDDATA to list exception SYSMODs, verify that necessary prerequisites are available, and to list potential problems, e.g., errors.
## Review exception SYSMODs for, e.g., ACTION, DOC, holds.
## Update documentation to reflect the exception SYSMODs, and take any necessary actions
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==Comparison to APAR==
At times<ref name="AmiTech">"Issues with Cognos and other IBM software can arise from configuration errors, problems in third-party hardware or software, and occasionally, because of a bug in the IBM product itself." {{cite web|url=http://www.amitechsolutions.com/uncategorized/ibm-support-authorized-program-analysis-reports|title=IBM Support – Authorized Program Analysis Reports|website=AmitechSolutions.com|access-date=2017-12-07|archive-url=https://web.archive.org/web/20171208122616/http://www.amitechsolutions.com/uncategorized/ibm-support-authorized-program-analysis-reports/|archive-date=2017-12-08|url-status=dead}}</ref> IBM software has a bug.
Once IBM has ascertained that the cause is not one of
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