Priority Set For Initial Copy Operations And Scheduling Order - HP StorageWorks P9000 User Manual

Use the following formula
Required number of bitmap areas = (ceil((number of cylinders x 15)
122,752) )
where:
"number of cylinders x 15" indicates the number of slots
122,752 = the number of slots that a bitmap area can manage
To calculate the maximum number of pairs that can be created
The maximum number of pairs you can create is defined by the following:
The number of LDEVs in the storage system
Table 6 The relationship between installed additional shared memory and the total number of
LDEVs in the storage system
Installed additional shared memory for Cnt Ac-J Z
Base(16KLDEV,BC/VM)
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
P-VOL
LDEV 00
LDEV 01
LDEV 02
LDEV 03
The order of starting initial copy and the Priority which is set for the P-VOLs are shown in the
following table.
Total number of LDEVs in storage system
16,384
65,280
Value set for Priority
2
3
1
4
Planning pair volumes 31