HP XP Continuous Access Software - Manual (Page 337)

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