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: 21D0XY, 21D2XX, DD2XYY, DEF0ZZ, EF5XYY, EFD000,
FF5XYY
• Secondary system: DD2XYY
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 primary 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 primary 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.
6-34
Disaster recovery of global-active device
Hitachi Virtual Storage Platform G1000 Global-Active Device User Guide
To Next Page
Loading...
