HP serviceguard t2808-90006 User Manual download pdf (Page 93)

Disaster Scenarios and Their Handling

Chapter 4 93

This scenario is an extension of

the previous failure scenario. In

the previous scenario, when the

package fails over to N2, it does

not start as the value of

RPO_TARGET would have been

exceeded.

To forcefully start the package

P1 on N2 when the FC links are

not restored on N2, check the

package log file on N2 and

execute the commands that

appear in it.

If the FC links are not

restored on N2, you can only

start the package forcefully.

You can forcefully start a

package only if it is

determined that the

associated data loss is

acceptable.

After you execute the force

start commands, package

P1 starts on N2 and runs

with md0 consisting of only

(/dev/hpdev/mylink-sdf).

Complete the following procedure

to initiate a recovery:

1. Reconnect the FC links

between the data centers. As a

result, S1

(/dev/hpdev/mylink-sde)

becomes accessible from N2

2. Run the following command to

add S1 to md0 on N2

# mdadm --add /dev/md0

/dev/hpdev/mylink-sde

This command initiates the

re-mirroring process from S2 to

S1. When re-mirroring is complete,

the extended distance cluster

detects S1 and accepts it as part of

md0.

Table 4-1 Disaster Scenarios and Their Handling (Continued)

Disaster Scenario

What Happens When

This Disaster Occurs

Recovery Process

1 2 ... 88 89 90 91 92 93 94 95 96 97 98 ... 103 104

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HP serviceguard t2808-90006 User Manual Page 93

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