IBM OS/390 User Manual
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Static
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Dynamic
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│
Partitions
│
Partitions
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├──────────────────────────────────────────────┴───────────────┤
│
│
│
│
SVA (31-Bit)
│
├──────┬───────┬───────┬───────┬───────┬───────┬───────┬───────┤
│
│
│ │ │ │ │ │ │ │
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16MB │------│-------│-------│-------│-------│-------│-------│-------│
│
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│
│ VSE/
│ CICS/ │ ACF/
│
│
│
│
│
│
│POWER │ VSE │ VTAM │
│
│
│
│
│
│ │ │ │ │ │ │ │
│
│ │ │ │ │ │ │ │
│ BG │ F1
│ F2
│ F3
│ .... │ FB
│ C1
│ Y1
│
├──────┴───────┴───────┴───────┴───────┴───────┴───────┴───────┤
│
│
│
│
SVA (24- Bit)
│
├──────────────────────────────────────────────────────────────┤
│
│
│
│
SUPERVISOR
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└──────────────────────────────────────────────────────────────┘
VSE/ESA V1 w/ 31-Bit Addressing
Figure 3. VSE/ESA Storage Layout
Figure 3 shows the virtual storage layout with VSE/ESA V1 or V2 exploiting
Enterprise Systems Architecture (ESA) and 31-bit addressing. VSE/ESA V1, with
31-bit virtual (and real) addressing support, provides virtual storage constraint
relief by extending the addressable area within a virtual address space from
16MB up to 2GB. This is a significant amount of constraint relief for both online
and batch applications running in either static or dynamic partitions.
Enterprise Systems Architecture (ESA) and 31-bit addressing. VSE/ESA V1, with
31-bit virtual (and real) addressing support, provides virtual storage constraint
relief by extending the addressable area within a virtual address space from
16MB up to 2GB. This is a significant amount of constraint relief for both online
and batch applications running in either static or dynamic partitions.
8
VSE to OS/390 Migration Workbook