z/VM: CP Commands and Utilities Reference - z/VM - IBM

DEFSYS
DEFSYS
►►
►
DEFSYS
PARMREGS=
Authorization
Purpose
Operands
name
▼ hexpage1-hexpage2
NONE
m
-n
Privilege Class: E
type
VMGROUP
212 z/VM: CP Commands and Utilities Reference
MINSIZE=
MACHMODE
nnnnnnnK
nnnnM
Use DEFSYS to define a skeleton system data file (Class S, SDF) for the named
saved system (NSS).
The skeleton file consists of a descriptor page containing all information necessary
to preserve the NSS with SAVESYS.
Note: Users cannot access the NSS until it has been saved.
name
is the name of the NSS that is a 1- to 8-character alphanumeric string.
,
▼ mm
Be careful not to specify a name that could be a hexadecimal device number
because the device with that name, if one exists, would be IPLed instead of the
named saved system.
hexpage1-hexpage2
is a range of pages to be saved. hexpage1 and hexpage2 are the page
numbers of available pages. When they are the same, only that page is saved.
The range may be contained in a single 1 MB segment, or it may comprise a
contiguous area in two or more segments. You may use multiple page ranges to
define a 1 MB segment. However, the page descriptor codes of all page ranges
in the same segment must have the same shared or exclusive attribute. (See
description of the type parameter for information about page descriptor codes.)
RSTD
Define only those pages whose data must be saved. Any page or pages in a
segment not explicitly defined in a page range on the DEFSYS command
defaults to the “no data saved” attribute. If other pages in the segment were
defined with the shared attribute (page descriptor codes SR, SW, SN and SC),
pages not specified on the command line become shared read-only pages
whose data is not saved. No page descriptor codes correspond to this state; it
has the same attributes as the state defined by page descriptor code SC,
except that CP does not write into these pages.
►
►◄