Refer to the following troubleshooting information if an issue occurs during the expansion of the DP-VOL capacity.

## Recovery procedure from failure if one volume capacity used in the SI pair cannot be expanded

If only one volume capacity used in an SI pair can be expanded, while the other cannot be expanded, the resync operation of the SI pair cannot be performed after the expansion because the capacity of both the volumes is not the same.

When an SI pair is used with TC, GAD, UR, or HTI, if the capacity of the P-VOL and the S-VOL used in one of the software products cannot be expanded, which causes the invalid state that the expansion of the entire volume capacity is not complete.

The following describes the procedure for recovering from the invalid state.- Verify that both the P-VOL and the S-VOL used in an
SI pair meet the prerequisites
for expanding the DP-VOL capacity described in Expanding DP-VOL capacity used
in a Hitachi ShadowImage
^{®}pair.When an SI pair is used with TC, GAD, UR, or HTI, the capacity of the P-VOLs and the S-VOLs in all of the used software products must be expanded.

Verify that all of the volumes meet the prerequisites for expanding the capacity described in the User Guide for each software product. If the prerequisites are not met, proceed to step 4.

- When the prerequisites for expanding the DP-VOL capacity are
met, retry the expansion, and make sure that the capacity of the P-VOL and the S-VOL used
in the SI pair is the same. If
there is not enough free space, increase the free space, and then expand the DP-VOL capacity.
When the SI pair is used with TC, GAD, UR, or HTI, retry the expansion of the volume capacity in all of the used software products, and make sure that the capacity of the P-VOL and the S-VOL used in each software product is the same.

As a result of the above operations, do one of the following:- If the expansion can be performed, proceed to step 3.
- If the expansion cannot be performed, proceed to step 4.

- Verify that the SI
pair is not being expanded.
As a result, the recovery procedure from the failure is complete.

- Delete the SI
pair, expand the volume capacity in the SMPL status, and then recreate the SI pair.
If you want to restore it to the conditions before the expansion due to a capacity input error and others, delete the SI pair, and then recreate the LDEV with the correct capacity. After that, recreate the SI pair.

If the capacity of the P-VOL and the S-VOL used in the SI pair or the HTI pair is not the same, you can only delete the SI pair or the HTI pair. You can read the S-VOL data used in the SI pair or the HTI pair before the expansion. If you want to use the data before the expansion, delete all pairs after the data reading is complete.

## Recovery procedure from failure if one volume capacity used in the SI pair has been expanded

Use the procedure to recover from a failure if only one volume capacity used in an SI pair can be expanded, while a failure occurs on the other volume before the expansion.

Make sure to recover from the failure first by following the recovery procedure in Troubleshooting ShadowImage.

However, depending on the operations during the recovery procedure, the following actions are required as shown in the table below.

Operation during recovery procedure | Action |
---|---|

Resynchronizing an SI pair | The resync operation cannot be performed because the capacity of the P-VOL and the S-VOL used in the SI pair is not the same. Perform the "Additional Steps" described below immediately before the SI pair resync operation. |

Deleting an SI pair Recovering from a volume failure Recreating an SI pair |
The SI pair cannot be created because the capacity of the target P-VOL and the S-VOL is not the same when recreating the SI pair. Perform the "Additional Steps" described below immediately before the SI pair resync operation. |

Deleting an SI pair Deleting a volume Creating a volume Recreating an SI pair |
The SI pair cannot be created because the capacity of the target P-VOL and S-VOL is not the same when recreating the SI pair. Make sure that the capacity of the P-VOL and the S-VOL is the same when creating the volumes. |

**Additional Steps**

Expand the capacity of volumes whose capacity has not been expanded, and then make sure that the capacity of the P-VOL and the S-VOL used in the SI pair is the same.

When an SI pair is used with other software, make sure to expand the capacity of the P-VOLs and the S-VOLs in all of the used software products. For more information about the expansion procedure, see the User Guide for the remote replication used with the SI pair.