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┌─────────────────────────────┐ ─────
││
│ 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.
6 VSE to OS/390 Migration Workbook