Recovery Of The Quorum Disk (Pair Status: Pair) - Hitachi G1000 User Manual

Before failure
Pair status and I/O
P-VOL
PAIR (Mirror
(RL))
COPY
(Mirror
(RL))
PSUS/PSUE
(Local)
PSUS/PSUE
(Block)
SIM
• Primary system: 21D0XY, 21D2XX, DD2XYY, DEF0ZZ, EF5XYY, EFD000,
FF5XYY
• Secondary system: 21D0XY, 21D2XX, DD2XYY, DEF0ZZ, EF5XYY,
EFD000, FF5XYY
Recovery procedure
1 Recover the quorum disk.
.
2 Resynchronize the pair.
.
Related topics
• Pair condition before failure on page 6-7

Recovery of the quorum disk (pair status: PAIR)

When the pair status is PAIR and the pair suspends due to quorum disk
failure, the P-VOL I/O mode is Local and the server continues I/O to the P-
VOL.
The following figure shows the failure area and recovery when the pair
suspends due to quorum disk failure.
6-40
Hitachi Virtual Storage Platform G1000 Global-Active Device User Guide
Pair status and I/O
mode
S-VOL P-VOL
PAIR (Mirror PSUE (Local) PSUE
(RL))
COPY PSUE (Local) PSUE
(Block)
SSUS/PSUE PSUS/PSUE
(Block) (Local)
SSWS PSUS/PSUE
(Local) (Block)
Disaster recovery of global-active device
After failure
Volume
accessible from
mode
the server
1
P-VOL
S-VOL
OK
(Block)
OK
(Block)
SSUS/PSUE OK
(Block)
SSWS NG
(Local)
Volume
with latest
data
S-VOL
NG P-VOL
NG P-VOL
NG P-VOL
OK S-VOL