
HA Failover and failback 337
Recovery after PVOL-PSUE-takeover
The special PSUE* state can be turned back to PAIR state by issuing the
pairresync command (after the recovery of the ESCON/FC link) instead of
the
horctakeover command.
If the pairresync command fails because the ESCON/FC link is not yet
restored, the PSUE* state is not changed.
Another PVOL-Takeover Case
The horctakeover from Host A (after a Host C failure) performs a
PVOL-PSUE-takeover in this nested (multiple) failure case.
Turns back to
original state
P-VOL
Host C
Host A
Host B
PSUS
PSUE*
PSUS
PSUE*
PSUS
PAIR
PAIR
PAIR
PAIR
PAIR
S-VOL
Host C
Host A
Host B
COPY
COPY
COPY
COPY
COPY
COPY
COPY
COPY
COPY
COPY
pairresync -l
on hostC
P-VOL
S-VOL
Host C
Host A
Host B
PAIR
PAIR
PAIR
PAIR
PAIR
PAIR
PAIR
PAIR
PAIR
PAIR
P-VOL
S-VOL
Host C Host A
Host B
PSUS
PSUE*
PSUS
PSUE*
PSUS
PAIR
PAIR
PAIR
PAIR
PAIR
horctakeover
P-VOL
Host failure
after ESCON
Host C
Host A
Host B
PSUS
PSUE*
PSUS
PSUE*
PSUS
PAIR
PAIR
PAIR
PAIR
PAIR
S-VOL
P-VOL
S-VOL
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