IBM OS/390 User Manual
┌─────────────────────────────┐ ─────
│
│
│
│ SVA -
2,304K
│
│
│
│
│
├─────────────────────────────┤
│
│ F1 - VSE/POWER -
832K │ 8,832K
Shared Address
├─────────────────────────────┤
│
Space Area
│ F2 - ACF/VTAM
- 3,648K │
│
├─────────────────────────────┤
│
│ F7 - DATABASE
- 2,048K │
├─────────┬─────────┬─────────┤ ─────
│
│
│ UNUSED │ UNUSED │
│ UNUSED │ 128K
│ 64K
│
│
│ 512K
├─────────┤
│
│
├─────────┤
├─────────┤
│
│ F6 1.5M │F9 1,536K│
│
│
│ │ │
CICS
│
│
Private Address
├─────────┼─────────┤
PROD
│ 7,168K
Space Area
│ F5 1.5M │
CICS
│
│
│
├─────────┤
PRD1
│
│
│
│ F4 1.5M │
│
│
│
├─────────┤FA 5,504K│ F3 7.1M │
│
│ BG 1.5M │
│
│
├─────────┴─────────┴─────────┤ ─────
│
│
SUPERVISOR
-
384K
│
└─────────────────────────────┘
0
Figure 1. VAE with Three Address Spaces
Figure 1 depicts a typical VSE virtual storage configuration using Virtual
Addressability Extension (VAE) introduced in VSE/SP V2. In this configuration the
largest possible address space is approximately 7MB. Therefore, a single
partition running in its own address space is limited to 7MB. Initially support was
for only three address spaces. This was later enhanced to nine.
Addressability Extension (VAE) introduced in VSE/SP V2. In this configuration the
largest possible address space is approximately 7MB. Therefore, a single
partition running in its own address space is limited to 7MB. Initially support was
for only three address spaces. This was later enhanced to nine.
6
VSE to OS/390 Migration Workbook