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Peter Flass (talk | contribs) →PTF usage: explain VIOS, doesn't look like it applies to mainframes |
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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
|author=Glenn Robinson |date=October 28, 2015
|url=http://powerwire.eu/tech-tip-populating-the-vios-virtual-media-repository}}</ref> If the "Cumulative PTF Pack" is larger than the default, "If you try (to) FTP 17GB of ISO images you will run out of space."
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