HP StorageWorks XP Remote Web Console Software - Manual (Page 57)

Journal Group
The Universal Replicator for Mainframe journal groups have the following requirements:
•
Each Universal Replicator for Mainframe pair must be assigned to one and only one journal
group.
Table 19 (page 57) shows the journal group specifications.
Table 19 Journal Group Specifications
Support specifications Item
Up to 256 journal groups (No. 0 - 255) per one
storage system
NOTE: The recommended number of journal
groups is up to 16.
Number of journal groups
Up to 8,192
The maximum number of data volumes that are
available for a journal group of the local storage
system depends on the number of data volumes
that can be registered to a journal group of the
paired storage system.
Number of data volumes in a journal group
At least 6GB.
If the capacity is below 6GB, the system
performance is unassured because the following
problems may occur.
Capacity of journal volumes in journal group
◦ The new data cannot be stored because the
journal volume is full, then the host performance
goes down.
◦ The performance of the initial copy goes down
because the journal volume is full.
◦ The journal group is suspended because the
journal volume is full.
◦ The indication of usages is invalid.
Up to 4 (ID No.: 0 to 3)
NOTE: If TrueCopy for Mainframe Sync. uses No.
0, No. 1 to 3 are available for Universal Replicator
for Mainframe.
Number of Mirror IDs
The same number of journal volumes is not required in a master journal group and a restore journal
group that are paired.
Mirror ID is required for a configuration that will be supported in the future within the 3-data center
(3DC), including the expected future enhancement to enable the user to pair one master journal
group with two or more restore journal groups. Each pair relationship in a journal group is called
a Mirror. Mirror ID identifies two or more mirrors that one journal group has. The same Mirror ID
Requirements and Restrictions for Universal Replicator for Mainframe 57