HP NonStop G-Series - Manual (Page 26)

AutoSYNC Overview
HP AutoSYNC User’s Guide—522580-016
1-4
Reporting
Reporting
It is often difficult to measure how dynamic your processing environment really is. The
reporting function allows you to evaluate the amount of change that occurs on the file
sets you wish to synchronize, without performing the actual data movement. Reporting
is useful for planning system migrations and for configuring the frequency of scheduled
synchronizations, either for disaster recovery or for data distribution purposes.
Limitations
The following product limitations apply:
•
Enscribe alternate keys are not automatically synchronized with the base file,
unless they are included in the file set definition.
•
SQL tables with indexes residing in a subvolume other than the base table
subvolume are synchronized, but the user must provide the mapping between the
source and destination volume names; otherwise all index tables are placed into
the subvolume of the base table.
AutoSYNC Component Description
AutoSYNC has three primary components, a command interpreter, AUTOSYNC, a
monitor process, $ZASY, and a synchronization program ASYSYNC.
AUTOSYNC Command Interpreter
The command interpreter is the user interface for performing both administration and
configuration of AutoSYNC, as well as requesting one-time synchronization and other
utility functions. It has a syntax similar to SQLCI.
AutoSYNC Monitor Process
The NonStop AutoSYNC monitor process, $ZASY, is a fault-tolerant process pair.
When synchronizations are scheduled, it ensures that the proper synchronization
processes are executing. It reports to the operator, through EMS, any anomalies that
have disrupted proper synchronization.
ASYSYNC and ASYSYNCP Synchronization Programs
The ASYSYNC and ASYSYNCP programs manage the synchronization. A one-time
SYNCHRONIZE command executes an ASYSYNC process. For a scheduled
synchronization, the monitor process executes an ASYSYNCP process. This manual
refers to all such processes as ASYSYNC.
ASYSYNC manages files in the source file set and starts a second ASYSYNC process
to manage files in the destination file set. The two processes execute in parallel and
communicate efficiently to compare file information and pass a stream of data
containing the files that need to be copied.