Expanding DP-VOL capacity when a GAD pair is used with Universal Replicator

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

You can expand the capacity of DP-VOLs when pairs are created in a 3DC delta resync configuration with GAD and UR. For the detailed procedures for verifying the differential data management method, expanding the capacity, and verifying the expansion during the following procedure, see Expanding DP-VOL capacity used in GAD pair.

The V-VOL to be expanded must not be an external volume.
LDEV formatting must not be in process on the V-VOL to be expanded.
The pool containing the V-VOL to be expanded must meet any of the following conditions:
- Normal condition
- The pool is not being shrunk.
When using GAD, TC, or UR, make sure that there is enough software license capacity for the page capacity assigned to the expanded volume capacity before the expansion.

Verify that each volume of the P-VOLs and S-VOLs in the GAD pairs and the UR pairs with volumes shared with GAD meets the prerequisites.
Display detailed information about the GAD pair, UR pair, and UR delta resync pair by using the pairdisplay command.
Verify whether the current differential data management method is SM difference management or hierarchical difference management.
- If SM difference management is applied, proceed to step 3.
- If hierarchical difference management is applied, proceed to step 4.
Change the differential data management method to hierarchical difference management.
(For VSP One Block 85) Do so for both the P-VOL and the S-VOL. If the P-VOL and the S-VOL are on different types of storage systems, change the differential data management method on each storage system.
1. Change the system settings for hierarchical difference management.
  (For VSP One Block 85) Set advanced system settings No. 5 to ON and No. 6 to OFF by using the raidcom modify user_system_opt command.
  Command example:
```
raidcom modify user_system_opt -opt_id 5 -opt enable
```
```
raidcom modify user_system_opt -opt_id 6 -opt disable
```
  (For VSP One Block 20 series) Set system option modes (SOMs) 1198 to ON and 1199 to OFF by using the raidcom modify system_opt command.
  Command example:
```
raidcom modify system_opt -system_option_mode system -mode_id 1198 -mode enable
```
```
raidcom modify system_opt -system_option_mode system -mode_id 1199 -mode disable
```
2. Swap suspend the GAD pair.
  The delta resync operation can be performed automatically.
3. Verify the pair statuses of the GAD pair, UR pair, and UR delta resync pair, and that the delta resync operation is complete correctly.
4. Swap suspend the GAD pair again.
  The delta resync operation can be performed automatically.
5. Verify the pair statuses of the GAD pair, UR pair, and UR delta resync pair, and that the delta resync operation is complete correctly.
6. Display the detailed information about the GAD pair, UR pair, and UR delta resync pair on CCI, and then verify that the current differential data management method is the hierarchical difference management.
Suspend the GAD pair and UR pairs.
Expand each volume capacity, and then verify that the expansion is complete in the following expansion order:
1. Expand S-VOL in the UR pair (S-VOL in the UR delta resync pair).
  If you cannot expand the S-VOL capacity in the UR pair, expand the P-VOL capacity in the GAD pair, or resynchronize the GAD pair or UR pair, make sure to perform the recovery procedure described in Recovering from failure if one volume capacity in GAD pair cannot be expanded.
2. Expand S-VOL in the GAD pair.
3. Expand P-VOL in the GAD pair.
Resynchronize the GAD pair and UR pair.

Verify that both the pair statuses of the P-VOL and S-VOL in each pair of the GAD pair have changed to PAIR(Mirror(RL)) and in each pair of the UR pair have changed to PAIR.

In addition, verify that each volume capacity in the GAD pair, UR pair, and UR delta resync pair is not being expanded.

The following table shows how the expansion process is displayed.

Expansion status	P column in the pairdisplay command
Not being expanded	N
Being expanded	E*
* This status continues to be displayed after expanding the P-VOL or S-VOL capacity in the GAD pair or the UR pair, and before performing the pair resync operation. After the resync operation is complete, the status is migrated to the Not being expanded status. In the UR delta resync pair, the Being expanded status will not be displayed on CCI because the expansion in the UR delta resync pair is complete concurrently with the GAD pair and the UR pair.

In step 2, if the differential data management method is SM difference management, change back to SM difference management using the following procedure.
(For VSP One Block 85) Do so for both the P-VOL and the S-VOL. If the P-VOL and the S-VOL are on different types of storage systems, change the differential data management method on each storage system.
1. To change back to the SM difference management method:
  (For VSP One Block 85) Set advanced system settings No. 5 to ON and No. 6 to ON by using the raidcom modify user_system_opt command.
  Command example:
```
raidcom modify user_system_opt -opt_id 5 -opt enable
```
```
raidcom modify user_system_opt -opt_id 6 -opt enable
```
  (For VSP One Block 20 series) Set SOMs 1198 to OFF and 1199 to ON by using the raidcom modify system_opt command.
  Command example:
```
raidcom modify system_opt -system_option_mode system -mode_id 1198 -mode disable
```
```
raidcom modify system_opt -system_option_mode system -mode_id 1199 -mode enable
```
2. Swap suspend the GAD pair.
  The delta resync operation can be performed automatically.
3. Verify the pair statuses of the GAD pair, UR pair, and UR delta resync pair, and that the delta resync operation has completed correctly.
4. Swap suspend the GAD pair again.
  The delta resync operation can be performed automatically.
5. Verify the pair statuses of the GAD pair, UR pair, and UR delta resync pair, and that the delta resync operation is complete correctly.
6. Display the detailed information about the GAD pair, UR pair, and UR delta resync pair on CCI, and then verify that the current differential data management method is SM difference management.
7. (For VSP One Block 85) If the settings of advanced system settings No. 5 and No. 6 have been changed, set No. 5 to OFF and No. 6 to OFF by using the raidcom modify user_system_opt command.
  Command example:
```
raidcom modify user_system_opt -opt_id 5 -opt disable
```
```
raidcom modify user_system_opt -opt_id 6 -opt disable
```
  (For VSP One Block 20 series) If the settings of SOMs 1198 and 1199 have been changed, set SOMs 1198 to OFF and 1199 to OFF by using the raidcom modify system_opt command.
  Command example:
```
raidcom modify system_opt -system_option_mode system -mode_id 1198 -mode disable
```
```
raidcom modify system_opt -system_option_mode system -mode_id 1199 -mode disable
```