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Chapter 4. Virtualization concepts 73
Figure 4-6 Allocation of a CKD logical volume
Figure 4-6 shows how a logical volume is allocated with a CKD volume as an example. The
allocation process for FB volumes is very similar and is shown in Figure 4-7 on page 74.
1113 1113 1113
1113
free
Extent Pool CKD0
Rank-x
Rank-y
3390 Mod. 3
1113
free
1113
free
used used
Allocate 3226 cylinder
volume
1113 1113 1113
1113
used
Extent Pool CKD0
Rank-x
Rank-y
3390 Mod. 3
1000
used
1113
used
used used
Logical
3390 Mod. 3
113 cylinders unused
Volume with
3226 cylinders