On Alpha and Integrity servers, allows you to modify an existing
entry in the Reserved Memory Registry data file.
Format
RESERVED_MEMORY MODIFY name
1 – Parameter
name
Name associated with the entry being removed. You must specify a
name.
2 – Qualifiers
2.1 /ALLOCATE
/ALLOCATE
/NOALLOCATE (default)
Allocates pages during the next reboot of the system as specified
on the command line. (The default is taken from the existing
Reserved Memory Registry entry.) The physical alignment of the
pages is based on the maximum granularity hint factor that can
be used to map the pages depending on the size of the reserved
memory.
Possible granularity hint factors are 512 pages (or 4 MB) and 64
pages (or 512 KB). Therefore, assuming an 8-KB system page size,
reserved memory is physically aligned as follows:
o size >= 4 MB: physically aligned on a 4-MB boundary
o size < 4 MB: physically aligned on a 512-KB boundary
If you specify /NOALLOCATE, or if you do not specify /ALLOCATE,
memory is reserved only by reducing the system's fluid page
count, but no specific pages are set aside.
2.2 /GLOBAL_SECTION
/GLOBAL_SECTION (default)
/NOGLOBAL_SECTION
/NOGLOBAL_SECTION indicates that the memory qualifier is for
a privileged application instead of a group or system global
section. (/GLOBAL_SECTION indicates that the memory qualifier is
for a group or system global section.) You cannot use /NOGLOBAL_
SECTION with the qualifiers /GROUP, /SYSGBL, or /PAGE_TABLES.
2.3 /GROUP
/GROUP=n
Establishes that the reserved memory is for a group global
section. The value n specifies the UIC group number (in octal) of
the process that creates the group global section. Only processes
within the creator's UIC group number are allowed access to the
global section. For example, if a process with the UIC of [6,100]
is the creator of the group global section, the group number for
the /GROUP qualifier is 6.
You cannot use the /GROUP qualifier with either /SYSGBL or
/NOGLOBAL_SECTION qualifiers.
2.4 /NEW_RAD
/NEW_RAD=nn
/NONEW_RAD
Use NEW_RAD to change the RAD assignment for an entry. Do this by
first specifying /RAD=n to identify the entry you want to change
and then specify /NEW_RAD=nn to identify the new RAD. Use only
/NEW_RAD=nn (without the /RAD qualifier) if the old entry did not
have a RAD assigned.
2.5 /PAGE_TABLES
/PAGE_TABLES (default)
/NOPAGE_TABLES
Reserves additional memory for shared page tables system as
specified on the command line. (The default is taken from the
existing Memory Registry.)
When the memory-resident global section is created, shared
page tables are created for the global section. If you do not
specify /ALLOCATE, or if you specify /NOALLOCATE, the additional
reserved memory is deducted from the system's fluid page count.
If you specify /ALLOCATE, additional pages are allocated for the
shared page table during the next reboot of the system, and the
additional reserved memory is deducted from the system's fluid
page count.
If you do not specify /PAGE_TABLES, or if you specify /NOPAGE_
TABLES, additional memory is not reserved for shared page tables.
When the memory-resident global section is created, shared page
tables are not created for the global section.
You cannot specify /PAGE_TABLES if the reservation has the
attribute /NOGLOBAL_SECTION.
2.6 /RAD
/RAD=n
/NORAD
MODIFY/RAD=n affects only the entry for the specified resource
affinity domain (RAD). The value of n is the RAD you specify.
Usage Rules
o Do not use MODIFY/RAD=n to change the size of a reservation
for an entry without a specified number or to change the
state of the /ZERO or /PAGE_TABLES flags. (Flags are always
consistent for all entries in a given reservation.)
o To change the RAD assignment for an entry, specify /RAD=n
to identify the entry you want to change and /NEW_RAD=nn to
identify the new RAD. Use only /NEW_RAD=nn (without the /RAD
qualifier) if the old entry did not have a RAD assigned.
o Use MODIFY name /NORAD if you no longer want to tie memory
for this reservation to any specific RADs. SYSMAN compresses
multiple entries into a single entry for an unspecified RAD
with the total memory size as the sum of all RAD entries for
this reservation.
2.7 /SIZE
/SIZE=size of reserved memory, in MBs
Specifies the number of megabytes to be deducted from the
system's fluid page count for this memory-resident global section
when the VMS$RESERVED_MEMORY.DATA data file is read during system
initialization. The default value for /SIZE is taken from the
existing Reserved Memory Registry.
2.8 /SYSGBL
Indicates that a reservation is for a system global memory
resident section.
You cannot combine this qualifier with the /GROUP or /NOGLOBAL_
SECTION qualifier. This qualifier is the default unless you
specify /GROUP or /NOGLOBAL_SECTION.
2.9 /ZERO
/ZERO
/NOZERO (default)
/ZERO implies /ALLOCATE. If you specify /ZERO, preallocated
pages are zeroed during system initialization. Zeroed pages
are required for memory-resident global sections; however, the
pages do not need to be zeroed during system initialization. The
default value is taken from existing Reserved Memory Registry
entry.
/NOALLOCATE implies /NOZERO because /ZERO is incompatible with
/NOALLOCATE. If you do not specify /ZERO, or if you specify
/NOZERO, preallocated pages are not zeroed during system
initialization. Instead, these pages are zeroed when the global
section is created.
3 – Description
The Reserved Memory Registry entry to be modified is identified
by the combination of the following items:
name
/[NO]GLOBAL_SECTION
/GROUP=n
/SYSGBL
The values of these qualifiers are the same as for the RESERVED_
MEMORY ADD command.
4 – Example
SYSMAN> RESERVED_MEMORY MODIFY
X234567890123456789012345678901/SIZ=2/ZERO
$ TYPE SYS$SYSTEM:VMS$RESERVED_MEMORY.DATA
! VMS$RESERVED_MEMORY.DATA
! Do NOT edit this file
! Modify with SYSMAN RESERVED_MEMORY commands
! A = /ALLOCATE, Z = /ZERO, P = /PAGE_TABLES, VERSION = 1
! SIZE (MB) RESERVATION NAME GROUP A Z P
1 X23456789012345678901234567890 1 0 0 1
2 X234567890123456789012345678901 SYSGBL 1 1 1
1 X2345678901234567890123456789012 NOGBL 0 0 0
SYSMAN> EXIT
$
The command in this example modifies an entry to reserve 2 MB
of memory and to allocate and zero this memory at boot time.