Table 1 shows the current allowable
fast replication options in the DFSMShsm environment. Note, however,
that IBM System Storage DS8000 series might permit different combinations
of FlashCopy® options.
Table 1. Allowable combinations
of fast replication options| Can FR option → be used with an FR
operation or option ↓? |
Multiple (up
to 12) FlashCopy targets |
COPY
mode
(Copy pool
VERSIONS
= 1 to 85)
|
NOCOPY
mode
(Copy Pool
VERSIONS
= 0)
|
Incremental FlashCopy |
Preserve Mirror |
FlashCopy SE |
Fast reverse
restore |
FlashCopy consistency group |
|---|
| FRBACKUP COPYPOOL |
Yes |
Yes |
Yes |
Yes |
Yes |
Yes |
Yes (1) |
Yes |
| FRRECOV COPYPOOL |
No |
Yes |
Yes/No (2) |
Yes |
Yes |
Yes (2) |
Yes |
No |
| FRRECOV TOVOLUME |
No |
Yes |
No (4) |
Yes |
Yes |
No (4) |
No |
No |
| FRRECOV DSNAME |
Yes |
Yes |
No (4) |
No (5) |
Yes |
No (4) |
No |
No |
| |
| Multiple (up
to 12) FlashCopy targets |
– |
Yes |
Yes (3) |
Yes (6) |
Yes |
Yes (3) |
No (7) |
Yes |
| COPY mode |
Yes |
– |
No |
Yes |
Yes |
No |
Yes |
Yes |
| NOCOPY mode |
Yes (3) |
No |
– |
No |
Yes |
Yes |
Yes |
Yes |
| Incremental FlashCopy |
Yes (6) |
Yes |
No |
– |
Yes |
No |
Yes |
Yes |
| Preserve Mirror |
Yes |
Yes |
Yes |
Yes |
– |
No |
No |
Yes |
| FlashCopy SE |
Yes (3) |
No |
Yes |
No |
No |
– |
Yes |
Yes |
| Fast reverse
restore |
No (7) |
Yes |
Yes |
Yes |
No |
Yes |
– |
Yes (8) |
| FlashCopy consistency group |
Yes |
Yes |
Yes |
Yes |
Yes |
Yes |
Yes (8) |
– |
Notes: - When a copy pool is defined to allow for fast reverse restore,
its copy pool backup versions will be created with fast reverse restore
capability.
- DFSMShsm FR copy pool recovery from NOCOPY or space efficient
backup volumes can only be used with fast reverse restore. When the
NOCOPY version is defined without fast reverse restore capability,
the FRRECOV copy pool operation can be performed from dump tapes.
- A DASD backup version created in NOCOPY mode without fast reverse
restore capability is withdrawn when the dump tape has been created.
A NOCOPY DASD backup version with fast reverse restore capability
can be used for recovery and is kept until it is withdrawn, deleted,
or replaced.
- FRRECOV in VERSIONS=0 environment can be performed FROMDUMP.
- If there is an existing incremental or persistent relationship,
the FRRECOV data set recovery command can be performed using standard
I/O. The FASTREPLICATION (PREFERRED | NONE)) parameter can be specified
to override the SETSYS FASTREPLICATION(DATASETRECOVERY) specification.
You can also specify FROMDUMP to recover from dump tapes.
- Only one of the relationships can be incremental.
- Multiple backup copies with fast reverse restore capability can
be created. However, only one relationship can exist when fast reverse
restore is used. All additional relationships must be removed before
fast reverse restore is initiated or the FRR operation will fail.
- A copy pool can be defined with either or both the FlashCopy consistency group option and
fast reverse restore capability. In the case where both FlashCopy consistency group = Yes and fast
reverse restore = Yes are designated, the copy pool will be backed
up using the FlashCopy consistency
group option; the copy pool backup DASD version will have fast reverse
restore capability. When FRRECOV COPYPOOL FROMDASD is performed, fast
reverse restore will be used. Consistency groups will not be used
in any FRRECOV operation.