HP XP P9500 Storage - Manual (Page 30)

Table 6 The relationship between installed additional shared memory and the total number of
LDEVs in the storage system
Total number of LDEVs in storage system Installed additional shared memory for Cnt Ac-J Z
16,384 Base(16KLDEV,BC/VM)
65,280 64KLDEV,BC/VM Extension1,FCV2,DP,Snapshot,TPF
•
The number of bitmap areas required to create pairs (determined above)
•
The number of bitmap areas of the storage system is 65,536.
Use the following formulae to calculate the maximum possible number of pairs that can be created,
on the basis of the number of bitmap areas and the required number of bitmap areas you calculated:
Maximum number of pairs = floor( Number of bitmap areas required number
of bitmap areas )
The maximum number of pairs is limited to 32,768.
If the calculated maximum number of pairs exceeds the total number of LDEVs of the storage system,
the total number of LDEVs in the storage system is the maximum number of pairs that can be created.
Priority set for initial copy operations and scheduling order
For performing more initial copy operations than the setting value of the Maximum Initial Copy
Activities set on the System Option dialog box, the scheduling order (Priority) can be set for the
initial copy operations to be performed. This section explains the assignment of the scheduling
order of initial copy operations in cases where two sets of multiple initial copy operations are
performed.
An example is described in which 4 data volume pairs are created at the same time in cases where
the setting value of the Maximum Initial Copy Activities is 2. The Priority which is set for the P-VOLs
of data volume pairs is shown in the following table.
Table 7 Priority set for P-VOLs for which initial copy operation is performed
Value set for Priority P-VOL
2 LDEV 00
3 LDEV 01
1 LDEV 02
4 LDEV 03
The order of starting initial copy and the Priority which is set for the P-VOLs are shown in the
following table.
Table 8 Correspondence relationship between order of starting initial copy and priority set for
P-VOLs
Value set for Priority P-VOL Order of starting initial copy
1 LDEV 02 1
2 LDEV 00 2
3 LDEV 01 3
4 LDEV 03 4
In this case, as the setting value of the Maximum Initial Copy Activities is 2, initial copy operations
for LDEV 02 and LDEV 00 are started. If either one of the initial copy operations for LDEV 02 and
LDEV 00 is completed, the initial copy for LDEV 01 is started.
30 Planning volumes, systems