HP StorageWorks XP Remote Web Console Software - Manual (Page 136)

136 TrueCopy for the XP128/XP1024/XP10000/XP12000
• 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 172.
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, refer to
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 XP128/XP1024/XP10000/XP12000 (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.
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 164.
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 138) and the consistency of the TC390A R-VOLs (see ” Analyzing the
Consistency of TrueCopy Asynchronous R-VOLs ” on page 139).
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 136). 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.
NOTE: If PPRC is not installed, connect to each RCU and delete all TC390 pairs. For TC390A
pairs, use the C/T delete option to delete all consistent pairs in the group at the same time. This
option prevents you from accidentally using inconsistent pairs for disaster recovery. Delete all
TC390 sync pairs in the MCU using the Delete by Force and Delete All Pairs options.
CAUTION: After an R-VOL changes to the simplex state, you cannot distinguish it from a
non-TC390 simplex volume. The TC390A C/T is also discarded when the pair is deleted.