Recovery procedures of ha system configuration, Recovery procedures of ha system configuration 353, Scenario – HP XP Continuous Access Software User Manual
Page 353: A failure occurs in host a or in the p-vol
HA Failover and failback
353
Recovery procedures of HA system configuration
After installing CA, the system administrator should conduct operation
tests on the assumption that system failures may occur. In normal
operation, service personnel obtain failure cause information from the SVP.
However, the CA commands may also give error information.
XP256 microcode 52-47-xx and under
XP512/48 microcode 10-00-xx and under
The following figure shows a diagram of system failure and recovery.
Scenario
1. A failure occurs in host A or in the P-VOL.
P-VOL recovers.
pairsplit -S
paircreate
Takeover
Takeover
Host A
Host B
P
vol
S
vol
Host A
Host B
P
vol
SMPL
Host A
Host B
S
vol
P
vol
pairsplit -S
paircreate
c
d
e Entire copy
Host A goes down.
Host A
Host B
P
vol
S
Vol
Host A
Host B
P
vol
SMPL
Host A
Host B
S
vol
P
vol
c
d
e Entire copy
P-VOL goes down.
Mirroring state
Takeover state
Recovery state
Failover
upon primary
host failure
Failover
upon primary
storage failure