The new management class
"Transition Copy Technique" setting
specifies which copy technique should be used for the class transitions.
Possible values are:
- STANDARD (STD)
- specifies that only standard I/O should be used to perform the
data movement. This is the default.
- FAST REPLICATION PREFERRED (FRP)
- specifies that fast replication should be used when possible.
If fast replication cannot be used, then it is acceptable to use standard
I/O to perform the data movement.
- FAST REPLICATION REQUIRED (FRR)
- specifies that fast replication is required. If fast replication
cannot be used, then the transition fails.
- PRESERVE MIRROR PREFERRED (PMP)
- specifies that a Metro Mirror primary volume is allowed to become
a FlashCopy target and it would be preferable that the Metro Mirror
pair does not go into a duplex pending state as a result of the FlashCopy
operation when the target volume is a Metro Mirror primary volume.
If the preserve mirror operation cannot be accomplished, then the
FlashCopy operation is still to be attempted. If the intended FlashCopy
target volume is not a Metro Mirror primary volume, then
the rules for FAST REPLICATION PREFERRED (FRP) are followed.
- PRESERVE MIRROR REQUIRED (PMR)
- specifies that a Metro Mirror primary volume is allowed to become
a FlashCopy target, and the Metro Mirror pair must not go into a duplex
pending state as a result of the FlashCopy operation when the target
volume is a Metro Mirror primary volume. If the preserve mirror operation
cannot be accomplished, then the FlashCopy should not be attempted.
If the target volume is not a Metro Mirror primary volume, then the rules for FAST REPLICATION REQUIRED (FRR)
are followed.
Note that if a copy technique other than NONE is specified, then
a valid backup copy must exist before the data set is transitioned.
This ensures that if an error occurs while physically moving the data
through a storage controller function, then a backup is available
to recover the data set.