Administering Data Volumes

VVR VEA enables you to administer data volumes from any host in an RDS. You can perform the following volume administration tasks using VVR VEA:

• Associating a Data Volume to an RDS
• Resizing a Data Volume in a Replicated Data Set
• Dissociating a Data Volume from its RDS

Associating a Data Volume to an RDS

Use the Associate Volume task to associate a volume to an Replicated Data Set (RDS) even when replication is in progress. This command associates a volume to all the RVGs of the RDS.

Ensure that volumes of the same name and same length exist on the Primary and all the Secondaries of the RDS. You must create volumes of the required layout on the Primary and the Secondary.

Prerequisites for associating a volume to an RDS

  Ensure that volumes of the same name and length as the Primary volumes exist on all the hosts in the RDS. If not, create them.

  Verify that the volume to be added is inactive.

  Synchronize the volume using the vradmin syncvol command from the command-line interface (CLI).

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  Note    By default, the Associate Volume task associates Data Change Maps (DCMs) to the volumes being added to the RDS, if DCMs have not been associated already. If any of the data volumes contains a DRL, this operation removes the DRL before associating the DCM to the volume.

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  To associate a volume with an RDS

1. Select the name of the RDS to which you want to associate the volume. For example, hr_rvg.
2. Choose Replication > Associate Volume. To use the pop-up menu, right-click the name of the RDS in the tree-view and select Associate Volume.
3. In the Associate Volume dialog box, select the name of the data volume to be associated with the RDS. If the RVG contains VxVM ISP volumes, the list displays VxVM ISP volumes only.
4. Click OK. The result box displays a message, which indicates whether or not the operation succeeded.
5. In the result box, click OK.

Resizing a Data Volume in a Replicated Data Set

Use the Resize Volume task to resize a data volume in a Replicated Data Set (RDS) even while replication is in progress. The Resize Volume dialog box resizes the specified data volume in all the RVGs in an RDS.

Important Notes for Resizing a Data Volume

• If the Primary data volume contains a file system, then resizing the data volume resizes the file system also.
• If replication to any Secondary RVG is in progress, resizing the volume pauses the Secondary, resizes the Primary data volume, and then resumes replication.
• If resizing the volume fails on any of the hosts in the RDS, the original volume sizes are not restored. The volumes sizes will not match on the Primary and the corresponding Secondary hosts. To correct the mismatch, correct the error condition, run the Resize Volume wizard again to resize the volume, and resume replication.
• When you increase the size of a data volume, the newly added portions on the Primary and Secondary volumes are not synchronized.

Prerequisite for resizing a data volume in an RDS

  Before increasing the size of a data volume, verify whether there is enough space in the disk group on the Primary and the Secondary.

  To resize a data volume in an RDS

1. From the tree view, double-click the RDS name and select the host name. For example, seattle or london.
2. From the Primary RVG view or Secondary RVG view, click the Data Volume tab to display the list of volumes.
3. Select the name of the data volume to be resized. For example, hr_dv01.
4. Choose Replication > Resize Volume. To use the pop-up menu, right-click the name of the data volume and select Resize Volume.
5. In the New Size box, type the new size of the data volume. Note that this value must be an integer. You cannot enter decimal numbers.
6. Select the unit of measurement. The default is megabytes (MB).
7. To decrease the size of the data volume hr_dv01 when the size of the Primary and Secondary data volumes is the same, click Force Resize.
8. Click OK. The result box displays a message, which indicates whether or not the operation succeeded.
9. In the result box, click OK.

   Note:
   Use the Data Volume tab in the RVG View to view the new size of the resized data volume.

Dissociating a Data Volume from its RDS

Use the Dissociate Volume dialog box to remove a data volume from an RDS. The Dissociate Volume task only dissociates the data volume from the RVGs in an RDS; it does not delete the volume.

To remove a data volume from its RDS even when the application has not been stopped, select Force Dissociate from the Dissociate Volume dialog box.

  To dissociate a data volume from its RDS

1. Select the name of the RDS from which you want to dissociate the volume. For example, hr_rvg.
2. Choose Replication > Dissociate Volume. To use the pop-up menu, right-click the name of the RDS in the tree view and then select Dissociate Volume. The Dissociate Volume dialog box is displayed.
3. From the drop-down box, select the name of the data volume to be dissociated from the RDS.
4. To dissociate the volume, if the application has not been stopped, click Force Dissociate.
5. Click OK. The result box displays a message, which indicates whether or not the operation succeeded.
6. In the result box, click OK.