HP XP P9500 Storage - Manual (Page 31)

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 9 Priority set for P-VOLs of data volume pairs to be added
Value set for Priority P-VOL
2 LDEV 10
1 LDEV 11
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.
Table 10 Order of starting initial copy being performed
Remark Value set for Priority P-VOL Order of starting initial copy
Data volume pair for which
initial copy is already
instructed to be performed 1 LDEV 02 1
Data volume pair for which
initial copy is already
instructed to be performed 2 LDEV 00 2
Data volume pair for which
initial copy is already
instructed to be performed 3 LDEV 01 3
Data volume pair for which
initial copy is already
instructed to be performed 4 LDEV 03 4
Data volume pair for which
initial copy is newly
instructed to be performed 1 LDEV 11 5
Data volume pair for which
initial copy is newly
instructed to be performed 2 LDEV 10 6
Priority is determined within the range of the number of initial copy operations performed at the
same time. Therefore, until the first initial copy operations complying with the order of the Priority
are completed, the additional initial copy operations are not started.
Disaster recovery considerations
You define a disaster recovery solution when planning the Continuous Access Journal Z system.
The following are the main tasks for preparing for disaster recovery:
•
Identify the data volumes that you wand to back up for disaster recovery.
•
Pair the important volumes using Continuous Access Journal Z.
•
Establish file and database recovery procedures.
•
Install and configure host failover software error reporting communications (ERC) between the
primary and secondary sites.
For more information on host failover error reporting, see the following section. Also, review
“Disaster recovery operations ” (page 103) to become familiar with disaster recovery processes.
Disaster recovery considerations 31