Explanation
FASTREPLICATION is an optional parameter that specifies which copy
method to use for data set level recovery and other fast replication
options.
The following parameters are optional parameters of the FASTREPLICATION
parameter:
- DATASETRECOVERY
- DSR
- Fast replication should be used for data set level recovery.
- NONE
- Fast replication is not used. Only traditional copy methods
are to be used. This is the default.
- PREFERRED
- Fast replication should be used as the copy method for data-set-level
recovery whenever possible. For situations in which fast replication
cannot be used to recover a data set, recovery is done through traditional
copy methods.
- REQUIRED
- Fast replication must always be used. If fast replication cannot
be used, the recovery request fails.
- FCRELATION
- FCREL
- Specifies whether an extent-level or a full-volume-level FlashCopy® relationship is
to be established for fast replication backup and recovery of volumes.
- EXTENT
- Extent-level FlashCopy relationships
are established during backup and recovery. Free space is not flashed.
This is the default.
- FULL
- Full-volume FlashCopy relationships
are established during volume backup and recovery. The entire volume
including free space is copied. Therefore, the background copy might
take longer to complete.
- VOLUMEPAIRMESSAGES
- VPM
- Controlling FlashCopy volume
pairing debug message ARC1809I.
- YES
- FlashCopy volume
pairing debug message ARC1809I is enabled.
- NO
- FlashCopy volume
pairing debug message ARC1809I is disabled.
SMS relationship
Parameter has the same meaning when applied to SMS-managed or non-SMS-managed
DASD volumes or data sets.
SETSYS default
If you specify:
- DATASETRECOVERY without a parameter, then the SETSYS default is
to use traditional copy methods. Fast replication is not used (NONE).
- FCRELATION without a parameter, then the SETSYS default is to
establish extent-level FlashCopy relationships
(EXTENT).
DFSMShsm default
If you do not specify:
- DATASETRECOVERY on a SETSYS command or FASTREPLICATION on a FRRECOV
DSNAME, the default is to use traditional copy methods. Fast replication
is not used (NONE).
- FCRELATION on the SETSYS command, the default is to establish
extent-level FlashCopy relationships
(EXTENT).
- VOLUMEPAIRMESSAGES on the SETSYS command, the default is to disable
ARC1809I messages (NO).
Usage notes: - The FASTREPLICATION value specified on the FRRECOV DSNAME command
overrides the SETSYS value.
- The SETSYS FASTREPLICATION command is applicable for recovery
from DASD only. If the recovery is from tape, the DATASETRECOVERY
parameter is ignored.
- DATASETRECOVERY(NONE) cannot be used in combination with FlashCopy targets that are
Metro Mirror primary volumes. That is, when the ALLOWPPRCP parameter
is specified with: YES, PRESERVEMIRRORNO, PRESERVEMIRRORPREFERRED,
or PRESERVEMIRRORREQUIRED.
- Data set recovery from DASD is not permitted if NOCOPY is used
to create the backup copy. The recovery cannot be performed until
a dump copy has been created.
- The combination of the FROMDASD and FASTREPLICATION(DATASETRECOVERY(REQUIRED))
restricts data set recovery to being performed only when fast replication
can be used.
- Specifying FCRELATION does not affect data set recovery.
- Specifying FCRELATION(EXTENT) to establish extent-level FlashCopy relationships is
ignored during FRBACKUP and FRRECOV operations when the copy pool
is defined to use a function that requires full-volume FlashCopy (such as fast reverse
restore or incremental).