The following is provided to help you prepare TrueCopy for Mainframe volumes:
- A volume can be assigned to only one pair.
- Volumes on the primary and secondary storage systems must be defined and formatted prior to pairing.
- The S-VOL must be equal-to or larger-than the P-VOL. However, if the S-VOL is larger than the P-VOL, the swap operation cannot be performed.
- TrueCopy for Mainframe requires a one-to-one relationship between the P-VOL and S-VOL. The P-VOL cannot be copied to more than one S-VOL*, and an S-VOL cannot have more than one P-VOL.
* When the PPRC multi-target function is enabled, one P-VOL can be copied to two S-VOLs.
- Pair volumes must meet the following disk track format requirements. TrueCopy for Mainframe cannot detect exceptions to these requirements. The primary system will abort the initial copy operation if the track format for both the P-VOL and S-VOL does not meet the following requirements:
- The P-VOL and S-VOL must have the same track format.
- Record zero (R0) must be standard format, with key length of zero and data length of eight. The primary system will abort the initial copy operation if R0 is not standard format.
- The CCHH (logical cylinder address and logical head address) of R0 must be identical to the physical cylinder address and physical head address of the track.
- The CCHH of each user record in a track must be unique.
- TrueCopy for Mainframe operates on volumes rather than on datasets. Multi-volume datasets require special attention. For complete duplication and recovery of a multi-volume dataset (for example, a large database file that spans several volumes), make sure that all volumes of the file are copied to TrueCopy for Mainframe S-VOLs.
- TrueCopy for Mainframe pair volumes can be shared with non-TrueCopy for Mainframe Hitachi software products. For details, see Sharing TrueCopy for Mainframe volumes.