IBM DS8000 - Manual (Page 114)

92 DS8000 Series: Concepts and Architecture
Figure 5-7 Allocation of a CKD logical volume
Figure 5-7 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 5-8 on page 93.
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