Replacing the external storage system while keeping GAD pairs

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 replace the current external storage system with a new one while keeping GAD pairs.

CAUTION:

If a GAD pair is not specified for the same quorum disk ID, delete the quorum disk first, and then re-create a quorum disk. When a GAD pair is not specified for the same quorum disk ID, if you replace the quorum disk with a new one, the replacement might fail. When you re-create a quorum disk, create GAD pairs if necessary.

Check the pair operation mode for the blocked quorum disk.

Depending on the check results, you might have to split the GAD pair.

If the QM column output with pairdisplay -fcxe command is AA, go to step 2.

If the QM column is other than AA, go to step b.

# pairdisplay -g oraHA -fcxe -d dev0
Group PairVol(L/R) (Port#,TID, LU),Seq#,LDEV#.P/S,Status,Fence,%,
P-LDEV# M CTG JID AP EM E-Seq# E-LDEV# R/W QM
oraHA dev0(L) (CL1-C-0, 0, 0) 811111 400.P-VOL PAIR NEVER,100
500 - - 0 1 - - - L/M AA
oraHA dev0(R) (CL7-C-0,28, 0) 822222 500.S-VOL PAIR NEVER,100
400 - - 0 1 - - - L/M AA

Split the GAD pair if it is not already split.
```
pairsplit -g oraHA -IH0
```

If you split the GAD pair in step 1, resynchronize the GAD pair.
```
pairresync -g oraHA -IH0
```
Disconnect the GAD pair from the quorum disk.
1. Disconnect the primary storage system from the quorum disk.
```
raidcom disconnect external_grp -ldev_id 0x2045 -IH0
```
2. Disconnect the secondary storage system from the quorum disk.
```
raidcom disconnect external_grp -ldev_id 0x2045 -IH1
```

Confirm that the GAD pair is disconnected from the quorum disk.

Check if the primary storage system is disconnected from the quorum disk.

raidcom get path -path_grp 1 -IH0
PHG GROUP STS CM IF MP# PORT WWN PR LUN PHS
Serial# PRODUCT_ID LB PM
1 1-1 DSC E D 0 CL5-A 50060e8007823520 1 0 NML
833333 VSP One B20 series N M

Check if the secondary storage system is disconnected from the quorum disk.

raidcom get path -path_grp 1 -IH1
PHG GROUP STS CM IF MP# PORT WWN PR LUN PHS
Serial# PRODUCT_ID LB PM
1 1-2 DSC E D 0 CL5-C 50060e8007823521 1 0 NML
833333 VSP One B20 series N M

Prepare a new quorum disk.
1. Format the disk of a new external storage system.
2. Map the formatted disk to the primary and secondary storage systems.
  Use the same procedure you use for creating a quorum disk. However, you do not need to set an external volume for the quorum disk.

Check the status of the quorum disk.

On the primary storage system, confirm that the status of the quorum disk is BLOCKED.

raidcom get quorum -quorum_id 1 -IH0
QRDID : 1
LDEV : 2045
QRP_Serial# : 811111
QRP_ID : M8
Timeout(s) : 30
STS : BLOCKED

On the secondary storage system, confirm that the status of the quorum disk is BLOCKED.

raidcom get quorum -quorum_id 1 -IH1
QRDID : 1
LDEV : 2045
QRP_Serial# : 822222
QRP_ID : M8
Timeout(s) : 30
STS : BLOCKED

Replace the old LDEV with a new one.
1. On the primary storage system, replace the current external volume for the quorum disk with a new one.
```
raidcom replace quorum -quorum_id 1 -ldev_id 1234 -IH0
```
2. On the primary storage system, confirm that the status of the quorum disk is REPLACING.
```
raidcom get quorum -quorum_id 1 -IH0
QRDID : 1
LDEV : 1234
QRP_Serial# : 811111
QRP_ID : M8
Timeout(s) : 30
STS : REPLACING
```
3. On the secondary storage system, replace the current external volume for the quorum disk with a new one.
```
raidcom replace quorum -quorum_id 1 -ldev_id 1234 -IH1
```
4. On the secondary storage system, confirm that the status of the quorum disk is REPLACING.
```
raidcom get quorum -quorum_id 1 -IH1
QRDID : 1
LDEV : 1234
QRP_Serial# : 822222
QRP_ID : M8
Timeout(s) : 30
STS : REPLACING
```
  Note:
  If the raidcom replace quorum command is executed normally, the status of the quorum disk changes from BLOCKED to REPLACING in a few seconds. If the status does not change in a few minutes, contact customer support.
Confirm that the status of the quorum disk is NORMAL.
1. On the primary storage system, confirm that the status of the quorum disk is NORMAL.
```
raidcom get quorum -quorum_id 1 -IH0
QRDID : 1
LDEV : 1234
QRP_Serial# : 811111
QRP_ID : M8
Timeout(s) : 30
STS : NORMAL
```
2. On the secondary storage system, confirm that the status of the quorum disk is NORMAL.
```
raidcom get quorum -quorum_id 1 -IH1
QRDID : 1
LDEV : 1234
QRP_Serial# : 822222
QRP_ID : M8
Timeout(s) : 30
STS : NORMAL
```
  If the raidcom replace quorum command is executed normally, the status of the quorum disk changes from REPLACING to NORMAL in a minute.
If the status does not change in five minutes, check whether remote paths between the storage systems are in normal state.
Confirm that the GAD pair you resynchronized is synchronized normally.

Note:
The status of the quorum disk being replaced might be initialized to NORMAL due to a storage system failure. In this case, the status of the quorum disk on the other storage system might remain REPLACING even after five minutes pass. If this is the case, resynchronize the GAD pair after recovering from the storage system failure so that the status changes to NORMAL.

The status of the quorum disk also remains REPLACING if the GAD pair is not specified for the quorum disk ID. If this is the case, delete the quorum disk first, and then re-create a quorum disk. Then create a GAD pair. If you want to create a GAD pair without deleting the quorum disk, perform step 8 again after creating a GAD pair.

If the status of the quorum disk does not change after performing these methods, contact customer support.

Note: If the status of the quorum disk is FAILED, the primary storage system and the secondary storage system might be connected to different quorum disks. Specify the external volume so that the primary storage system and the secondary storage system are connected to the same quorum disk. After specifying the correct external volume, perform steps 8 through 10.