HP StorageWorks XP Remote Web Console Software - Manual (Page 147)

Hitachi TrueCopy for z/OS user guide 147
You should prepare for file and database recovery by using:
• Files for file recovery (for example, DB2 log files that have been verified as current). To ensure the
currency of these files, use the R-VOL Data fence level setting for the TC390 pairs that contain these
important files.
• The sense information with system time stamp that will be transferred through ERC.
Remote copy and disaster recovery procedures are inherently complex. Consult your HP account team on
sense-level settings and recovery procedures.
For information on recovering a pinned track on a TC390 volume, see ”
Pinned track recovery for TrueCopy
volumes ” on page 187.
CSUSPEND/QUIESCE TSO command
CAUTION: The QUIESCE option of the CSUSPEND command has been disabled by APAR OW15247 or
APAR OW15248. For detailed information on the QUIESCE option of the CSUSPEND command, see either
of these APARs. Check with your HP account team before using the CSUSPEND command with the
QUIESCE option to suspend TC390 volume pairs on an XP12000/XP10000 (or other XP disk array). If the
CSUSPEND command with the QUIESCE option is issued to certain volumes (for example, active SPOOL,
PAGE, or CATALOG datasets, or active SYSRES volume), the attached host(s) may enter a deadlock
condition and may require a storage control IML to correct the condition. TC390A does not support the
CSUSPEND/QUIESCE option.
NOTE: If you select a pair from the volume list and change the settings, and if you use a drop-down list to
set blank to a parameter, the parameter takes the default value for each pair. If you select the settings from
the preset list before applying the changed settings, and if you use a drop-down list to set blank to a
parameter in the Suspend Pair panel, the parameter value in the preset list will not be changed.
IEA494I system console message
The IEA494I message is recommended as a trigger for automation over the IEA491E message because the
IEA494I message is reported to all attached MVS hosts each time the M-VOL pair status changes, whereas
the IEA491E message is reported to only one host system. For more information on the IEA494I and
IEA491E messages, see ” IEA494I and IEA491E console messages ” on page 179.
Switching operations to the remote site
If a disaster or failure occurs at the main site, the first disaster recovery activity is to switch your operations
to the remote backup site. The TC390 Synchronous R-VOLs are recovered individually based on the pair
status and M-VOL fence level information for each pair. The TC390A R-VOLs are recovered based on pair
status, consistency status, and consistency time.
The basic procedures for switching operations to the remote backup site are:
1. Analyze the currency of the TC390 Synchronous R-VOLs (see ” Analyzing the currency of TrueCopy
Synchronous R-VOLs ” on page 148) and the consistency of the TC390A R-VOLs (see ” Analyzing the
consistency of TrueCopy Asynchronous R-VOLs ” on page 149).
2. Record the consistency time (C/T) of each group. The suspended TC390A R-VOLs with consistency
status of group will indicate the same C/T.
3. Perform file recovery as needed (see ” File and database recovery procedures ” on page 146). The C/T
of each TC390A group can be used to retrieve lost updates.
4. At the remote site, suspend all pairs by issuing the CSUSPEND TSO command to the R-VOLs. Use the
TCzA group and drain suspend options to destage pending updates in cache to the R-VOLs. And then,
change the state of R--VOLs to simplex by issuing the CRECOVER TSO command.