Hitachi G1000 - Recovering the Path from the Secondary to External System (Pair Status: PAIR)

data when you can no longer use any physical path from the secondary
system to the quorum disk's external system.
Before failure After failure
Pair status and I/O
mode
Pair status and I/O
mode
Volume
accessible from
the server
Volume
with latest
data
P-VOL S-VOL P-VOL
S-VOL
1
P-VOL S-VOL
PAIR (Mirror
(RL))
PAIR (Mirror
(RL))
PSUE (Local) PSUE
(Block)
OK NG P-VOL
COPY
(Mirror
(RL))
COPY
(Block)
PSUE (Local) PSUE
(Block)
OK NG P-VOL
PSUS/PSUE
(Local)
SSUS/PSUE
(Block)
PSUS/PSUE
(Local)
SSUS/PSUE
(Block)
OK NG P-VOL
PSUS/PSUE
(Block)
SSWS
(Local)
PSUS/PSUE
(Block)
SSWS
(Local)
NG OK S-VOL
SIM
• Primary system: DD2XYY
• Secondary system: 21D0XY, 21D2XX, DD2XYY, DEF0ZZ, EF5XYY,
EFD000, FF5XYY
Recovery procedure
1. Recover the paths to the external system.
2. Resynchronize the pair.
Related topics
•
Pair condition before failure on page 6-7
Recovering the path from the secondary to external system (pair
status: PAIR)
The following figure shows the failure area and recovery when the pair
suspends due to path failure from the secondary system to the external
system.
When pair status is PAIR and the pair suspends due to a failure of the
external storage system or of a path to an external system, the P-VOL I/O
mode is Local, and the server continues I/O to the P-VOL.
Disaster recovery of global-active device
6-37
Hitachi Virtual Storage Platform G1000 Global-Active Device User Guide