I am always on the lookup for commands that can improve the way we work, and reduce time and mistakes. I recently found this blog from a fellow AIX professional that gives a really nide explanation of the chdef (Change Definitions command). If you don't have time to read the full article, The chdef command modifies the default value of a predefined attribute of a specified device type. The idea is (for instance) that if you create a lot of fibre LUNS and always need to set the hcheck interval to 60, you can make this the default for every new device instead of having to remember to change it later.
https://www.ibm.com/developerworks/community/blogs/brian/entry/change_aix_device_default_attributes_with_chdef_command?lang=en
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