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

If the calculated maximum number of pairs exceeds the total number of LDEVs of the storage system
and the total LDEV number is less than 32,768, the total number of LDEVs in the storage system is
the maximum number of pairs that can be created.
The maximum number of pairs is limited to 32,768.

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 3 Priority set for P-VOLs for which initial copy operation is performed
P-VOL
LUN 00
LUN 01
LUN 02
LUN 03
The order of starting initial copy and the Priority which is set for the P-VOLs are shown in the
following table.
Table 4 Correspondence relationship between order of starting initial copy and priority set for
P-VOLs
Order of starting initial copy
1
2
3
4
In this case, as the setting value of the Maximum Initial Copy Activities is 2, initial copy operations
for LUN 02 and LUN 00 are started. If either one of the initial copy operations for LUN 02 and
LUN 00 is completed, the initial copy for LUN 01 is started.
The next example explains the assignment of the scheduling order of initial copy operations in
cases where initial copy is already performed and two volume pairs are newly added. The P-VOLs
of the data volume pairs to be newly added and the Priority are shown in the following table.
Table 5 Priority set for P-VOLs of data volume pairs to be added
P-VOL
LUN 10
LUN 1 1
If initial copy is already started and if any initial copy is newly added, the additional initial copy
is started after the previously performed initial copy is completed. The Priority of all the initial copy
operations being performed is shown in the following table.
Value set for Priority
2
3
1
4
P-VOL
LUN 02
LUN 00
LUN 01
LUN 03
Value set for Priority
2
1
Value set for Priority
1
2
3
4
Planning pair volumes 27