HP StorageWorks XP Remote Web Console Software - Manual (Page 24)

Timer Type Option
The timer type option allows you to specify the method applied by the primary storage system to
acquire the time-stamp information for each journal data. The following timer types are available
for selection:
•
System. When the System timer option is selected, the primary storage system acquires the
time-stamp information for each journal data as follows. When a URz pair is established, the
primary storage system reports state-change-interrupt (SCI) to all hosts. The host then issues a
series of sense group commands to determine the device status change, and the primary
storage system returns the same response as if the device had been added to an XRC session
to activate I/O time-stamping for the device. Once I/O time-stamping is activated, the MVS
IOS routine attaches the time-stamp information (contents of time-of-day (TOD) clock) to each
write I/O operation for the device. The time-stamp indicates the time that the update was
generated during start sub-channel (SSCH) at the main host system, and the time-stamp is
transferred to the primary storage system at the beginning of each I/O operation.
•
Local. When the Local timer option is selected, the primary storage system does not acquire
time-stamp information from the host I/O time-stamping function.
•
None. This timer option can be selected only when the copy direction of a URz volume pair
is in reverse direction (that is, from the secondary site to the primary site).
When the None option is selected, the primary storage system acquires time-stamp information
from the host I/O time-stamping function.
Journal Group Operations
URz provides the following group-based operations to simplify and expedite disaster or failure
recovery procedures:
•
Group operations at the primary subsystem.
◦ Split all pairs in a journal group. See Splitting a Mirror (Suspending a copy operation)
for a description of the Suspend Range-Group suspend pair option.
◦ Resume all suspended pairs in a journal group. See Restoring a Mirror (Resuming a copy
operation) for a description of the URz Resume Range-Group resume pair option.
◦ Delete all pairs in a journal group. Deleting Data Volumes from a Mirror (Ending a copy
operation) for a description of the Delete Range-Group delete pair option.
•
Group operations at the secondary subsystem
◦ Split (suspend pair) all pairs in a journal group. See Splitting a Mirror (Suspending a
copy operation) for a description of the Suspend Range-Group suspend pair option.
◦ Delete (delete pair) all pairs in a journal group regardless of their consistency status. See
Deleting Data Volumes from a Mirror (Ending a copy operation) for a description of the
Delete Range-Group delete pair option.
URz Delta Resync Operation
When you are using URz and TCz Synchronous in a 3DC multi-target configuration, URz provides
delta resync operation as one of the solutions for failures in primary site. In a 3DC multi-target
configuration, there are one primary site and two secondary sites; TCz Synchronous and URz
secondary sites. For detailed information about 3DC multi-target configuration, see
“Combining
URz with TCz Synchronous (3DC Multi-target Configuration)” (page 77) ).
If a failure occurs on the primary site in 3DC multi-target configuration, you need to use Business
Continuity Manager to use the TCz Synchronous secondary site as the primary site. If you perform
a delta resync operation after the TCz Synchronous secondary site becomes a primary site. The
24 Overview of Universal Replicator for Mainframe Operations