HP XP Business Copy Software - Manual (Page 114)

114 ShadowImage for the XP1024/XP128/XP12000/XP10000/SVS 200
NOTE:
•
In the case of the emulation type 3380-3, 3390-3, or 3390-3R, the maximum number of resources that
can be used as S-VOL is 16. You cannot create any pair if 16 resources are already used in the S-VOL,
and if the copy data range of relationships that are already established overlap with all the resources.
• In the case of the emulation type 3390-9, maximum number of resources that can be used as S-VOL is
48.
• In the case of the emulation type 3390-L, maximum number of resources that can be used as S-VOL is
144.
• In the case of the emulation type 3390-M, maximum number of resources that can be used as S-VOL is
272.
The number of pairs that can be created is determined according to the following condition.
The maximum number of relations that can be established is the largest number that meets the
equations, Σ(α) = (β) and Σ(γ) = 32,768, where:
Σ (α) stands for the total number of resources that need to be used,
(β) stands for the total number of resources available in the local disk array,
(β) = 13,652 when additional shared memory is not installed.
(β) = 30,718 when additional shared memory is installed.
And Σ(γ) stands for the total number of pairs.
Copying Data
in Two Extents
that Overlap
(Two T-VOLs)
See
Figure 59
2 (1 x
2)
1 (1 +
1)
4 6
(2 x 3)
6
(3 + 3)
12 18
(9 x 2)
18
(9 + 9)
36 34
(17 x 2)
34
(17 + 17)
68
Copying One
Extent to
Another in the
Same Volume
See
Figure 60
2 1 N/A 2 6 1 N/A 6 18 1 N/A 18 34 1 N/A 34
1. Half is for the copy source extent, and another half is for the copy target extent.
Table 48 Referential Examples for Calculating the Number of Resources Required for FlashCopy Mirror Pairs
Copy
Patterns
Required number of resources
3380-3, 3390-1,
3390-2,
3390-3,3390-3R
3390-9 3390-L 3390-M
S-VOL T-VOL Total S-VOL T-VOL Total S-VOL T-VOL Total S-VOL T-VOL Total