Continuous access xp, Overview of truecopy operations, Components – HP StorageWorks XP Remote Web Console Software User Manual
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Continuous Access XP
As an enterprise advantage, the XP128/XP1024/XP10000/XP12000 can be concurrently connected to
zSeries and S/390 and a variety of UNIX-based and PC-server hosts. Contact your HP account support
representative for the latest information on platform and version support. You can use the Continuous
Access (CA) XP feature to maintain remote copies of the UNIX/PC server data stored on the
XP128/XP1024/XP10000/XP12000. TC390 volumes and CA volumes can exist concurrently in the same
XP128/XP1024/XP10000/XP12000.
Overview of TrueCopy Operations
TC390 provides a storage-based hardware solution for concurrent data duplication, migration, and
disaster recovery operations. After TC390 operations are established, remote copies of data are
automatically maintained for backup and disaster recovery purposes. TC390 supports both SMS- and
non-SMS-managed data, is completely application-independent, and is designed to run unattended.
During normal TC390 operations, the main volumes remain online to all hosts and continue to process
both read and write I/O operations.
TC390 Synchronous provides:
•
Volume-based, real-time data backup and is ideal for high-priority data backup, duplication, and
migration tasks. In the event of a disaster or system failure at the main site, the remote (secondary)
TC390 Synchronous data can be rapidly invoked to allow recovery at the volume level with an
extremely high level of data integrity.
TC390 Asynchronous (TC390A) represents a unique and outstanding disaster recovery solution for large
amounts of data that span multiple volumes and even multiple XP128/XP1024/XP10000/XP12000.
TC390A’s group-based update sequence consistency solution enables fast and accurate database
recovery, even after a “rolling” disaster, without the need for time-consuming data recovery procedures.
The TC390A volume groups at the remote site can be recovered with full update sequence consistency, but
the updates will be behind the main site due to the asynchronous remote copy operations.
TC390A provides:
•
Update sequence consistency for user-defined groups of volumes (such as large databases).
•
Protection for write-dependent applications in the event of a disaster.
This overview of TC390 operations describes:
•
TC390 components (see page 18)
•
TC390 operations (see page 26)
•
TC390A recordset operations (see page 29)
•
TC390A consistency group operations (see page 35)
•
TC390 volume pair status and suspend types (see page 37)
•
PPRC support, including P/DAS and GDPS (CGROUP) operations (see page 41)
Components
TC390 operations involve the XP128/XP1024/XP10000/XP12000 (and/or other XP disk arrays) at the
main and remote sites, the physical communications paths between the main and remote disk arrays, and
the Command View XP management station or XP Remote Web Console. The main and remote disk arrays
must have the same controller emulation. TC390 copies the original online data at the main site to the
offline backup volumes at the remote site through the dedicated ESCON and/or Fibre Channel remote
copy connections. The Command View XP management station or XP Remote Web Console hosts the
TC390 software and provides a user-friendly Window®s-based graphical user interface (GUI) for all
TC390 functions and operations. The I/O time-stamping host software function, provided by MVS
DFSMSdfp, is required for TC390A consistency groups that span multiple disk arrays. Error reporting
communications (ERC) is required for effective disaster recovery with TC390.
1. If you use FICON for the path of application site, you should also use FICON for the path of System Data
Mover (SDM) because of the difference in performance between FICON and ESCON.