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Hitachi Lightning 9900™ User and Reference Guide 43
3.7.7 Hitachi Extended Remote Copy (HXRC)
The HXRC asynchronous remote copy feature of the 9900 subsystem is functionally
compatible with IBM
®
Extended Remote Copy (XRC). HXRC provides asynchronous remote
copy operations for maintaining duplicate copies of S/390
®
data for data backup purposes.
Once established, HXRC operations continue unattended to provide continuous data backup.
HXRC operations are nondisruptive and allow the primary HXRC volumes to remain online to
the host(s) for both read and write I/O operations. For HXRC operations, there is no distance
limit between the primary and remote disk subsystems. HXRC is also compatible with the
DFSMS data mover that is common to the XRC environment.
HXRC operations are performed in the same manner as XRC operations. The user issues
standard XRC TSO commands from the mainframe host system directly to the 9900
subsystem. The Remote Console PC is not used to perform HXRC operations. HXRC can be
used as an alternative to Hitachi TrueCopy – S/390
®
for mainframe data backup and disaster
recovery planning. However, HXRC requires host processor resources that may be significant
for volumes with high-write activity. The Data Mover utility may run in either the primary
host or the optional remote host.
Note: For 9900-specific information on HXRC (e.g. SVP modes), please see the Hitachi
Lightning 9900™ Hitachi TrueCopy – S/390
®
User and Reference Guide (MK-91RD050), or
contact your Hitachi Data Systems account team.
Note: For further information on XRC, please refer to the following IBM
®
publications:
Planning for IBM Remote Copy (SG24-2595), Advanced Copy Services (SC35-0355), and
Remote Copy Administrator’s Guide and Reference (SC35-0169).