Note the following when using PPRC commands:
- TrueCopy for Mainframe must be installed on the storage system.
- IBM® PPRC must be installed on the host operating system.
- With CU emulation type I-2107, the lss parameter must be set for both the primary and secondary system.
- Command extensions are supported with I-2107 emulation.
- The TSO
CESTPATH and PPRCOPY
ESTPATH commands remove paths previously established and replace them with the paths you specify. Make sure to specify existing paths that you want to continue using, or specify new paths.
If you delete all paths prior to running the command because you want to specify new paths with the command, the pair operation might be suspended because no paths exist temporarily.
- With Fibre Channel, do not use the CESTPATH and CDELPATH commands at the same time that you use the SCSI path definition function of LUN Manager. FC ports need to be configured as Birdirectional ports before the CESTPATH and CDELPATH commands are issued.
- The RESETHP option used with the CESTPATH command causes host I/O operations to be rejected. Before you use the RESETHP option, stop I/O operations from the host.
- PPRC commands may be rejected if you have registered 0xFFXX to the primary and secondary system SSID. Specify the command excepting 0xFFXX. (Note: the 'XX' of 0xFFXX is given in hexadecimal.)
- When you issue the QUERY command with the PATH option to the S-VOL using ICKDSF, the command might be rejected. If this happens, you can check path status using the CQUERY command.
- When using I-2107 CU emulation type for the primary system when the host is online to the S-VOL, run the CESTPAIR command to create a TCz pair requires ONLINSEC(YES). The operation fails if you do not use ONLINSEC or if you use ONLINSEC(NO).
You cannot check whether a host system is online if the secondary system does not support I-2107 CU emulation type. In this case, you can still run the CESTPAIR command with ONLINSEC(YES) if the primary system is a VSP One Block 85 and supports I-2107 CU emulation type.
- If the PPRCOPY SUSPEND command issued to a pair in Pending status is rejected, split the pair using CCI. Warning: The CSUSPEND command QUIESCE option is disabled by APARs OW15247/48. Make sure to check with customer support before using this command and option on the storage system. If the command and option is issued to certain volumes (for example, active SPOOL, PAGE, or CATALOG datasets, active SYSRES volume), the attached host might enter a deadlock condition, requiring storage control IML to correct the condition.
See APAR OW15247 or 48 and the IBM® PPRC documentation for detailed information.
- Preserve Mirror FlashCopy function with Compatible FlashCopy® V2: When you create Compatible FlashCopy® V2 Preserve Mirror relationships in COPY mode, both copies are not synchronized. If you issue Withdraw during the copy operation, both copies of the relationship are suspended. Therefore, data consistency between the P-VOL and S-VOL is not ensured even though the TCz pair is in DUPLEX mode. This status can be confirmed by the CQUERY command.
The following figure provides an example of when CQUERY is issued to the TCz P-VOL using the VOLUME parameter. The message, PAIR WAS THE TARGET OF A WITHDRAWN PRESERVE MIRROR RELATION, is displayed. To release this status, delete the TCz pair. After creating TCz pairs, Withdraw might fail if there is a change in the remote path status without communication in the remote path. This remote path status change might be a path setting change or path blockage for example. This can be resolved by issuing an I/O to the TCz pairs or resynchronizing the pairs after splitting them. For details about the Preserve Mirror FlashCopy function, see the Compatible FlashCopy® User Guide for VSP One Block 85.
