Failback without recovery on host b, P-vol, S-vol – HP XP Continuous Access Software User Manual
Page 341: S-vol p-vol, P-vol s-vol
HA Failover and failback
341
Failback without recovery on Host B
The following procedure for recovery is necessary if, after host and
ESCON/FC link recovery, you stop the application without executing the
pairresync –swaps
command on Host B and restart the application on the
Host A. At that time, the pairvolchk command on Host A will return
PVOL_PSUE and SVOL_PSUS as the state combination.
pairresync –swapp
This is used to swap the P-VOL/S-VOL designations during the P-VOL
suspend state. The new S-VOL is based on the data of the new P-VOL. The
target volume of the local host must have been the P-VOL, which was
probably out of date.
Delta COPY
Æ PAIR
P-VOL
Host C
Host A
Host B
PAIR
PSUE
PAIR
PAIR
PAIR
SSUS
SSUS
SSUS
SSUS
SSUS
S-VOL
Host C
Host A
Host B
COPY
COPY
COPY
COPY
COPY
COPY
COPY
COPY
COPY
COPY
pairresync
-swapp
on Host A
S-VOL
P-VOL
Host C
Host A
Host B
PAIR
PAIR
PAIR
PAIR
PAIR
PAIR
PAIR
PAIR
PAIR
PAIR
S-VOL
P-VOL
After PAIR
horctakeover
Host C
Host A
Host B
PAIR
PAIR
PAIR
PAIR
PAIR
PAIR
PAIR
PAIR
PAIR
PAIR
P-VOL
S-VOL