HP StorageWorks XP Remote Web Console Software - Manual (Page 42)

TCz Synchronous, URz primary site URz secondary site
primary host
master JNL VOL
journal obtain
secondary host
secondary subsystem
secondary
dataVOL
restore JNL VOL
journal restore
R-VOL
primary data VOL
master JNL VOL
journal obtain
primary subsystem
M-VOL
primary data VOL
TCz Synchronous
secondary site
journal
copy
Copying by TCz
Synchronous
Write
Data flow
secondary
host
secondary subsystem
Journal data flow URz pair for delta resync operation
Figure 7 Delta Resync Setting in 3DC Multi-target Configuration (Before Failure Occurs)
As shown in Figure 7 on page 42 a URz pair created with the delta resync option is defined as a
pair but no copy operation is performed (Hold status). Actual copy operation will not be performed
until when the failure occurs and delta resync operation is performed. There are several requirements
to create a URz pair for delta resync operation, such as you need to specify the unused mirror ID. For
detailed information about the requirements of creating a URz pair for delta resync operation, see
“ Requirements for Creating URz Pair for Delta Resync Operation ” on page 96.
For the information about the delta resync operation that will be performed when a failure occurs in the
configuration shown in Figure 7 on page 42 see “ Switching the Master Journal Group of URz ” on page 43.
42 Overview of Universal Replicator Operations