Recovering from a failure if the capacity of one volume in GAD pair cannot be expanded

Global Active Device for VSP One Block

Version

10.5.x

File Size

25537 KB

Audience

anonymous

Part Number

MK-23VSP1B011-11

ft:lastEdition

2026-06-23

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

If a GAD pair is used with Universal Replicator, ShadowImage, or Thin Image Advanced and the capacity of the P-VOL and S-VOL in one of the software products fails to expand, it causes the invalid state in which the expansion of the entire volume capacity is not complete. Perform the following operation to recover from the invalid state.

For more information about the I/O operations of the P-VOL and S-VOL in a GAD pair if the resync operation in a GAD pair cannot be performed, see I/O Modes.

Verify that all of the prerequisites are met.
If the prerequisites are not met, proceed to step 4.
1. Verify that both the P-VOL and S-VOL in a GAD pair meet the prerequisites for expanding the DP-VOL capacity.
  
  See the prerequisites for Expanding DP-VOL capacity used in GAD pair.
2. Verify that all of the volumes meet the prerequisites for expanding the capacity in each of the software products.
  If a GAD pair is used with UR, SI, or TIA, the capacity of the P-VOLs and S-VOLs in all of the used software products must be expanded.
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 S-VOL in the GAD pair is the same.
1. If there is not enough free space, increase the free space, and then expand the DP-VOL capacity.
2. If a GAD pair is used with UR, SI, or TIA, retry the expansion and make sure that the capacity of the P-VOL and S-VOL in each of the software products is the same.
- If you can expand the capacity, go to Step 3.
- If you cannot expand the capacity, go to Step 4.
Resynchronize the GAD pair.
When a GAD pair is used with UR, resynchronize the UR pair. As a result, the recovery procedure from the failure is complete.
Delete the GAD pair, expand the volume capacity in the SMPL status, and then re-create the GAD pair.
- If you want to restore to the conditions before the expansion due to a capacity input error and others, delete the GAD pair, and then recreate the LDEV with the correct capacity. After that, recreate the GAD pair.
- If a GAD pair is used with UR, Delete all pairs, expand the volume capacity in the SMPL status, and then restore the configurations by following the procedure for creating the configurations.
  If you want to restore to the conditions before the expansion due to a capacity input error and others, delete all pairs, and then recreate the LDEV with the correct capacity. After that, restore the configurations by following the procedure for creating the configurations.
- If a GAD pair is used with SI or TIA, and the capacity of the P-VOL and S-VOL in an SI pair or TIA pair is not the same, you can only delete the SI pair or TIA pair. You can read the S-VOL data in the SI pair or TIA pair before the expansion. If you want to use the data before the expansion, delete all pairs after the data reading is complete. Expand the volume capacity in the SMPL status, and then restore the configurations by following the procedure for creating the configurations.
  If you want to restore to the conditions before the expansion due to a capacity input error and others, delete all pairs, and then recreate the LDEV with the correct capacity. After that, restore the configurations.