Recovering the path: secondary to external storage system (pair status: PAIR)

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 path between the secondary storage system and the external storage system, you should know how to resolve the failure and restore the GAD pair. The following figure shows the failure area and recovery when the GAD status of a pair changes to Suspended or Quorum disk blocked due to path failure from the secondary storage system to the external storage system.

When the GAD status of the pair changes to Suspended, the P-VOL I/O mode changes to Local and the S-VOL I/O mode changes to Block. Server I/O continues on the P-VOL.

(VSP One Block 20 series) When the GAD status of the pair changes to Quorum disk blocked, the P-VOL I/O mode remains Mirror (RL), and the S-VOL I/O mode changes to Block.
(VSP One B85) When the GAD status of the pair changes to Quorum disk blocked, the P-VOL and S-VOL I/O modes remain Mirror (RL).

Server I/O continues on the P-VOL.

Recover the path to the external storage system.
1. Reconnect the physical path or reconfigure the SAN to recover the path to the external storage system.
  After the path is recovered, the remote path is automatically recovered.
2. Confirm that the external storage system is connected correctly.
```
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     NML E  D    0 CL5-C  50060e8007823521     1   0 NML   833333   VSP One B20 series N  M
```
3. Confirm the LDEV ID of the quorum disk by obtaining the information of the external volume from the secondary storage system.
```
raidcom get external_grp -external_grp_id 1-2 -IH1
T GROUP  P_NO  LDEV#   STS         LOC_LBA        SIZE_LBA            Serial#
E 1-2       0   9999   NML  0x000000000000  0x000003c00000             833333
```
4. Confirm that the secondary storage system recognizes the external volume as a quorum disk by specifying the LDEV ID of the quorum disk.
```
raidcom get ldev -ldev_id 0x8888 -fx -IH1
(snip)
QRDID : 0
QRP_Serial# : 811111
QRP_ID : M8
(snip)
```
  Note: VSP One B85 is displayed as RH20ETP in command output. VSP 5000 series is displayed as R9 in command output. VSP One B20 series, VSP E series, VSP Fx00 models, and VSP Gx00 models are displayed as M8 in command output.

If the GAD status of the pair is Quorum disk blocked: The pair changes to Mirrored status automatically.

If the GAD status of the pair is Suspended: Resynchronize the pair as follows.

Confirm that the P-VOL I/O mode is Local.

pairdisplay -g oraHA -fxce -IH0
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
oraHA   dev1(L)     (CL1-A-0, 0,   0)811111  2222.P-VOL PSUE 
NEVER ,  100  4444 -   -   0  -  -            -       - L/L
oraHA   dev1(R)     (CL1-C-0, 0,   0)822222  4444.S-VOL PSUE 
NEVER ,  100  2222 -   -   0  -  -            -       - B/B

At the primary storage system, resynchronize the pair.
```
pairresync -g oraHA -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.

Confirm that the P-VOL and S-VOL pair statuses change to PAIR (Mirror (RL)).

pairdisplay -g oraHA -fxce -IH0
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
oraHA   dev1(L)     (CL1-A-0, 0,   0)811111  2222.P-VOL PAIR 
NEVER ,  100  4444 -   -   0  -  -            -       - L/M
oraHA   dev1(R)     (CL1-C-0, 0,   0)822222  4444.S-VOL PAIR 
NEVER ,  100  2222 -   -   0  -  -            -       - L/M

pairdisplay -g oraHA -fxce -IH1
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
oraHA   dev1(L)     (CL1-C-0, 0,   0)822222  4444.S-VOL PAIR 
NEVER ,  100  2222 -   -   0  -  -            -       - L/M
oraHA   dev1(R)     (CL1-A-0, 0,   0)811111  2222.P-VOL PAIR 
NEVER ,  100  4444 -   -   0  -  -            -       - L/M

Using the multi-path software, resume I/O to the S-VOL (I/O might resume automatically).