Hitachi G1000 - Page 182

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
1
S-VOL P-VOL S-VOL
PAIR (Mirror
(RL))
PAIR (Mirror
(RL))
PSUE (Block)
SSWS (Local)
2
NG OK S-VOL
COPY (Mirror
(RL))
COPY (Block) PSUE (Local) PSUE (Block) NG NG P-VOL
PSUS/PSUE
(Local)
SSUS/PSUE
(Block)
PSUS/PSUE
(Local)
SSUS/PSUE
(Block)
NG NG P-VOL
PSUS/PSUE
(Block)
SSWS (Local) PSUS/PSUE
(Block)
SSWS (Local) NG OK S-VOL
Notes:
1. If shared memory in the primary system volatilizes, the P-VOL status changes to SMPL, and the GAD
reservation attribute is set for the volume.
2. If the server does not issue write I/O, the pair status might be PAIR (Mirror (RL)).
SIM
• Primary system: SIM varies depending on the failure type
• Secondary system: 2180XX, DD0XYY, DD3XYY
Recovery procedure
1. When the primary storage system is powered off, delete an alternate path
(logical path) to the P-VOL, and then turn on the power.
a. Using the alternate path software, distinguish the volumes which are
not able to be accessed from the server.
b. Using the alternate path software, delete the alternate paths to the P-
VOL.
If you cannot delete the alternate paths, detach all channel port
connection paths (physical paths) which are connected to the server
at the primary site.
2. Turn on the primary storage system.
3. Recover the primary storage system.
For details, contact Hitachi Data Systems customer support.
4. Recover the physical path between the primary and secondary systems.
5. If S-VOL pair status is PAIR, suspend the pair specifying the S-VOL.
6. Resynchronize or recreate a pair using the procedure in the following
table whose pair status and I/O mode match your pair's status and I/O
mode.
6-30
Disaster recovery of global-active device
Hitachi Virtual Storage Platform G1000 Global-Active Device User Guide