IPL type, mode, and speed options

• Use function 01 to display the current IPL option, including IPL speed. This is the option and speed that the system will use at the next IPL.
• Refer to the information in Table 3 for speed override definitions.
• Use the HDWDIAG (hardware diagnostics) parameter of the CHGIPLA command to permanently change the IPL speed. The values are: The default shipped value *MIN (minimal) for fast diagnostics and *ALL for all (full) diagnostics.

IPL speed recommendations

• Use CHGIPLA *MIN, or Function 02 F or V=F for most IPLs (to perform a fast IPL that uses minimum diagnostics).
• Use CHGIPLA *ALL, or Function 02 S or V=S, if you change hardware or suspect an intermittent hardware failure (to perform a slow IPL that uses all diagnostics).
• Use CHGIPLA *ALL, or Function 02 S or V=S during the first Install IPL. You can set this at the panel with Function 02; it affects only the one IPL because the next IPL will again pick up the value set with CHGIPLA.

For more information about:

• OS IPL types, see Table 1.
• Firmware IPL types, see Table 4.
• IPL modes, see Table 2.
• IPL speeds, see Table 3.