Associating a Data Change Map to a data volume


Associating a Data Change Map to a data volume
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The vradmin createpri, vradmin addsec, and vradmin addvol commands associate the Data Change Map (DCM) to the data volume by default. This section describes how to associate DCMs to a data volume in an existing VVR configuration.

See Data Change Map (DCM).

To associate a Data Change Map to a Data Volume

The vxassist command enables you to associate a DCM to a new data volume or an existing data volume.

Create the data volume and associate the DCM as follows:

# vxassist -g diskgroup make dv_name....... logtype=dcm

Associate the DCM with an existing data volume as follows:
```
# vxassist -g diskgroup addlog dv_name logtype=dcm
```

VVR mirrors the DCM by default. If loglen is not specified, vxassist calculates a suitable size for the DCM.

See Determining the region size .

Note:

If you try to grow a volume that has a DCM, an error message warns you if the DCM is not large enough for the increased size. In this case, dissociate the DCM, grow the volume, and then associate a new DCM to the volume.