Recovering from a quorum disk failure when neither GAD volume is accessible

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

When a failure occurs on the quorum disk and you cannot access either volume of a GAD pair from the server, you need to delete the UR and GAD pairs, then recover from the failure by using the volume at the UR secondary site, and then re-create the pairs.

Delete the UR pair.

Command example: pairsplit -g oraREMOTE -S -IH0
Delete the UR delta resync pair.

Command example: pairsplit -g oraDELTA -S -IH1
Delete the GAD pair.

When the I/O mode of both the primary and secondary volumes is Block, you can forcibly delete the pair, as follows:
1. If you specify the S-VOL, delete the virtual LDEV ID at the same time.
```
pairsplit -g oraHA -RF -IH1
```
2. Confirm that the virtual LDEV ID of the S-VOL indicates GAD reserve.
```
raidcom get ldev -ldev_id 0x2222 -fx -IH2
(Omitted)
LDEV : 2222
VIR_LDEV : ffff
(Omitted) 
```
  VIR_LDEV : ffff indicates GAD reserve.
3. Delete the pair forcibly by specifying the P-VOL.
  Do not delete the virtual LDEV ID.
```
pairsplit -g oraHA -SFV -IH0
```
4. Confirm that the virtual LDEV ID of the P-VOLis not deleted.
```
raidcom get ldev -ldev_id 0x1111 -fx -IH1
(Omitted) 
LDEV : 1111
(Omitted) 
```
  VIR_LDEV information is not displayed if it is same as LDEV information.
To forcibly delete a pair when the I/O mode is not Block, call Hitachi Vantara LLC customer support.
Create a UR pair between the UR secondary and primary sites.
Command example:
```
paircreate -g oraREMOTE -f async -vl -jp 0 -js 0 -IH2
```
If a failure occurs after the one volume capacity of a UR pair can be expanded, then the creation, resync, swap resync, horctakeover, and delta resync operations of the UR pair cannot be performed because the capacity of both the volumes is not the same. Make sure to expand the other volume capacity so that the capacity of both the volumes is the same, and then retry the operation.
You can resume operations at this point by using the P-VOL at the UR secondary site.
Remove the failure on the quorum disk.
Suspend the UR pair by specifying the S-VOL (swap suspend).

Command example: pairsplit -g oraREMOTE -RS -IH0

You can resume operations at this point by using the S-VOL at the primary site.
Resynchronize the UR pair by specifying the S-VOL (swap resync).
Command example:
```
pairresync -g oraREMOTE -swaps -IH0
```
If a failure occurs after the one volume capacity of a UR pair can be expanded, then the creation, resync, swap resync, horctakeover, and delta resync operations of the UR pair cannot be performed because the capacity of both the volumes is not the same. Make sure to expand the other volume capacity so that the capacity of both the volumes is the same, and then retry the operation.

The volume on the primary storage system changes to a P-VOL, and the volume on the UR secondary storage system changes to an S-VOL.
Delete the UR pair.

Command example: pairsplit -g oraREMOTE -S -IH0
Re-create the GAD pair.

Command example: paircreate -g oraHA -fg never 2 -vl -jq 0 -IH0

If a failure occurs after the one volume capacity of a GAD pair can be expanded, the creation, resync, swap resync, and horctakeover operations of the GAD pair cannot be performed because the capacity of both the volumes is not the same. Make sure to expand the other volume capacity so that the capacity of both the volumes is the same, and then retry the operation.
Re-create the UR delta resync pair.
Command example:
```
paircreate -g oraDELTA -f async -vl -jp 0 -js 0 -nocsus -IH1
```
If a failure occurs after the one volume capacity of a UR pair can be expanded, then the creation, resync, swap resync, horctakeover, and delta resync operations of the UR pair cannot be performed because the capacity of both the volumes is not the same. Make sure to expand the other volume capacity so that the capacity of both the volumes is the same, and then retry the operation.
Re-create the UR pair.
Command example:
```
paircreate -g oraREMOTE -f async -vl -jp 0 -js 0 -IH0
```
If a failure occurs after the one volume capacity of a UR pair can be expanded, the creation, resync, swap resync, horctakeover, and delta resync operations of the UR pair cannot be performed because the capacity of both the volumes is not the same. Make sure to expand the other volume capacity so that the capacity of both the volumes is the same, and then retry the operation.