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 |
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|---|---|---|---|---|---|---|
Pair status and I/O mode |
Pair status and I/O mode |
Volume accessible from the server* |
Volume with latest data |
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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 |
PAIR (Mirror (RL)) |
PAIR (Block) |
PAIR (Mirror (RL)) |
PAIR (Block) |
OK |
NG |
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. |
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SIMs
- Primary storage system: None
- Secondary storage system: None
- Recover the server.
- Recover the path from the server to the pair volumes.