Hitachi G1000 - Pair condition and recovery: server failures

Pair condition and recovery: server failures
The following table shows transitions for pair status and I/O mode, the
volumes that are accessible from the server, and the location of the latest
data when a server failure occurs.
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* P-VOL S-VOL
PAIR (Mirror
(RL))
PAIR (Mirror
(RL))
PAIR (Mirror
(RL))
PAIR (Mirror
(RL))
OK OK Both P-VOL
and S-VOL
COPY
(Mirror
(RL))
COPY
(Block)
COPY
(Mirror (RL))
COPY
(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
*If failures occur in all servers that access the P-VOL or S-VOL, then you cannot access
either volume.
SIM
• Primary system: None
• Secondary system: None
Recovery procedure
1. Recover the server.
2. Recover the path from the server to the pair volumes.
Related topics
• Pair condition before failure on page 6-7
Pair condition and recovery: path failure between the server
and storage system
If a server cannot access a pair volume whose status is PAIR, though no SIM
has been issued, a failure might have occurred between the server and the
storage system. The following topics provide procedures for recovering of the
physical path between the server and the storage systems.
The following table shows transitions for pair status and I/O mode, the
volumes that are accessible from the server, and the location of the latest
6-8
Disaster recovery of global-active device
Hitachi Virtual Storage Platform G1000 Global-Active Device User Guide