RDF/IMP, IMPX, and ZLT System Management Manual

Zero Lost Transactions (ZLT)
HP NonStop RDF/IMP, IMPX, and ZLT System Management Manual—524388-002
16-2
How It Works
Figure 16-1 shows the configuration where a single system serves as both the standby
and backup systems, and the remote mirror is located at the standby/backup site.
Figure 16-2 shows the configuration where a single system serves as both the standby
and backup systems, and the remote mirror is located at an intermediate site.
Figure 16-3 shows the configuration where individual standby and backup systems are
located at separate sites.
Figure 16-1. ZLT Configuration With a Single Standby/Backup System
Figure 16-2. ZLT Configuration With a Single Standby/Backup System, and the
Remote Mirror Located at an Intermediate Site
System A
(RDF primary)
System B
(RDF backup
and standby)
X fabric
Y fabric
Audit-Trail
Disk
Limited by disk technology
RDF traffic
(Expand lines)
Audit-Trail
Disk
System A
(RDF primary)
System B
(RDF backup
and standby)
X fabric
Y fabric
RDF traffic
(Expand lines)
X fabric
Y fabric
Audit-Trail
Disk
Audit-Trail
Disk
Limited by
disk technology
Limited by
disk technology