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| Creating a Primary RVG of an RDS | ||
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| Prev | Creating a Replicated Data Set | Next |
The first step in creating an RDS is creating its Primary RVG. VVR enables you to create a Primary RVG of an RDS using the vradmin createpri command.
The vradmin createpri command enables you to associate existing data volumes and the Storage Replicator Log (SRL) to the Primary RVG.
The vradmin createpri command performs the following operations:
Creates the Primary RVG on the host on which the command is issued.
Enables or starts the Primary RVG.
Associates DCMs to the data volumes in the RVG.
Associates the specified data volumes and SRL to the RVG.
Associates the specified volume sets (if any) to the RVG.
VVR does not support RAID-5 volumes, that is, volumes with usage type raid5 are not supported. Data volumes must be of usage type gen or fsgen. However, data volumes can be configured on hardware-based RAID-5 disks.
Dirty Region Logs (DRLs) are not needed with VVR because VVR uses the SRL to recover volumes, not the DRLs. If any of the data volumes or the SRL has a DRL, the vradmin createpri command removes the DRL before the data volume is associated to the RVG.
By default, the vradmin createpri command adds DCMs to the data volumes, if they have not already been added. The vradmin createpri command creates the DCM of an appropriate default size based on the size of the volume and mirrors the DCM by default. To create and add a DCM of a size that is different from the default, associate the DCM of the required size to the data volumes before running the vradmin createpri command.
Note: |
The vradmin createpri command will fail if there are not enough drives to mirror the DCM. You may need to associate the DCM to an appropriately sized data volume. |
See Associating a Data Change Map to a data volume.
The -nodcm option when used with the vradmin createpri command associates data volumes to the RVG but does not add DCMs to the data volumes.
If you want to associate additional volumes to the RVG after creating the RVG, use the vradmin addvol command.