Pair Condition Before Failure - Hitachi G1000 User Manual

SIM reference
DEF0XX
DFAXXX
DFBXXX
EF5XYY
EF9XXX
EFD000
FF5XYY
Related topics
• Failure locations on page 6-3
• Resolving failures in multiple locations on page 6-52

Pair condition before failure

The pair status and I/O mode of a GAD pair, the accessibility of the server,
and the storage location of the latest data depend on the status before a
failure occurs.
The following table shows pair status and I/O mode, the volumes accessible
from the server, and the location of the latest data before a failure occurs.
You can compare this information with the changes that take place after a
failure occurs, as described in the following topics.
Pair status and I/O mode
P-VOL
PAIR (Mirror
(RL))
COPY (Mirror
(RL))
PSUS/PSUE
(Local)
PSUS/PSUE
(Block)
Hitachi Virtual Storage Platform G1000 Global-Active Device User Guide
code
Quorum Disk Blocked
LDEV blockade(Drive path: Boundary 0/Effect of Drive port
blockade)
LDEV blockade(Drive path: Boundary 1/Effect of Drive port
blockade)
Abnormal end of Write processing in External storage system
LDEV blockade (Effect of drive blockade)
External storage system connection device blockade
Abnormal end of Read processing in External storage system
S-VOL
PAIR (Mirror
(RL))
COPY (Block)
SSUS/PSUE
(Block)
SSWS (Local)
Disaster recovery of global-active device
Description
Volume accessible from the
server
P-VOL S-VOL
OK OK
OK NG
OK NG
NG OK
Volume with
latest data
Both P-VOL and
S-VOL
P-VOL
P-VOL
S-VOL
6-7