HP XP RAID Manager Software - Manual (Page 339)

HA Failover and failback 339
PVOL-PSUE takeover
The horctakeover command executes a PVOL-PSUE-takeover when the
primary volume cannot report status or refuses writes (for example, data
fence).
• PSUE (or PDUB) and the horctakeover command returns a
PVOL-PSUE-takeover value at exit().
• A PVOL-PSUE-takeover forces the primary volume to the suspend
state (PSUE or PDUB
→
PSUE*, PAIR
→
PSUS), which permits
WRITEs to all primary volumes of the group.
The following illustrates how volumes in the same volume group may be of
different status. Only the volumes that were active at the time of link failure
would immediately be PSUE.
Host C Host A Host B
PSUS
PSUE*
PSUS
PSUE*
PSUS
PAIR
PAIR
PAIR
PAIR
PAIR
horctakeover
P-VOL
ESCON failure
Host C Host A Host B
PAIR
PSUE
PAIR
PSUE
PAIR
PAIR
PAIR
PAIR
PAIR
PAIR
S-VOL P-VOL S-VOL
ESCON/FC failure
ESCON/FC failure