RSVSTRT
RSVSTRT=nnnnnn - This parameter specifies the number of entries in the address
space vector table (ASVT) that are to be reserved for address spaces created
in response to a START command (such as an initiator, the APPC address space or
the library lookaside address space). The RSVSTRT entries are only
used after the number of entries specified by MAXUSER is obtained.
It is not recommended to depend on using the RSVSTRT entries under
normal operating conditions. By reserving RSVSTRT entries in the ASVT
for such address spaces, you can often avoid having to reinitialize
the system because there is no available entry in the ASVT for a critical
address space. For example, if library lookaside (LLA) ends and you issue
a START LLA command to restart LLA, but no ASVT entry is available,
LLA does not be restarted. However, if there are reserved entries
for critical address spaces (such as LLA), it is more probable that
an entry will be available and the LLA address space can be created
without having to reinitialize the system. However, too large a buffer can cause the system to allocate more system resources than are needed during a given IPL. The excessive allocation of system resources because of incorporating too large a buffer can lead to potential problems such as the following examples:
- The specification of RSVSTRT in conjunction with CSCBLOC=BELOW and MAXUSER can cause the system to allocate excessive storage below 16M. See CSCBLOC for details.
- An aggressively large MAXUSER, RSVSTRT, and RSVNONR can cause the system to allocate an excessive amount of storage, which can potentially lead to a wait state 204 reason 008 at IPL time. (Wait state 204 with reason 008: An error occurred during allocation initialization; the system could not obtain storage for device information.)
If started tasks or batch jobs that create non-reusable ASIDs end enough times, they will exhaust all available ASIDs and an IPL will be required. When loading the initial program is not an acceptable option, determine which programs caused the problems and fix them. For methods that prevent running out of ASIDs, see .
Value range: 0-32767. The sum of the values that are specified for the RSVSTRT, RSVNONR, and MAXUSER system parameters cannot exceed 32767.Value range: 5Associated parmlib member: None