HP XP P9500 Storage - Manual (Page 28)

Table 6 Order of starting initial copy being performed (continued)
Remark Value set for Priority P-VOL Order of starting initial copy
Data volume pair for which
initial copy is newly
instructed to be performed 1 LUN 11 5
Data volume pair for which
initial copy is newly
instructed to be performed 2 LUN 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 begin a disaster recovery solution when planning the Continuous Access Journal 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.
•
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 92) to become familiar with disaster recovery processes.
Host failover software
Host failover software is a critical component of any disaster recovery effort. When a primary
storage system fails to maintain synchronization of a Continuous Access Journal pair, the primary
storage system generates sense information. This information must be transferred to the remote site
using the host failover software for effective disaster recovery. RAID Manager provides failover
commands that interface with industry-standard failover products.
Sharing volumes with Continuous Access Synchronous, other program
products
Continuous Access Journal volumes can be shared with other program product volumes. Sharing
pair volumes results in enhanced replication solutions, for example when Continuous Access Journal
and Continuous Access Synchronous, Business Copy, or External Storage Access Manager volumes
are shared.
For planning information, see the following:
•
“Continuous Access Journal configurations with Continuous Access Synchronous” (page 130)
•
“Continuous Access Journal configurations with Business Copy” (page 143)
•
“Continuous Access Journal configurations with External Storage Access Manager” (page 147)
•
“Sharing Continuous Access Journal volumes ” (page 125) for the following program products:
LUN Expansion ◦
◦ Virtual LUN
◦ Cache Residency
◦ LUN Manager
◦ Thin Provisioning
28 Planning volumes and systems