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Disaster Scenarios and Their Handling
Chapter 488
A package (P1) is running on a
node (Node 1). The package uses
a mirror (md0) that consists of
two storage components - S1
(local to Node 1 -
/dev/hpdev/mylink-sde) and
S2 (local to Node 2)
Data center 1 that consists of
Node 1 and P1 experiences a
failure.
NOTE: In this example, failures
in a data center are
instantaneous. For example -
power failure.
The package (P1) fails over
to Node 2 and starts
running with the mirror of
md0 that consists of only
the storage local to node 2
(S2).
Complete the following procedure
to initiate a recovery:
1. Restore data center 1, Node 1
and storage 1. Once Node 1 is
restored, it rejoins the cluster.
Once S1 is restored, it
becomes accessible from Node
2.
When the package failed over
and started on Node 2, S1 was
not a part of md0. As a result,
you need to add S1 into md0.
Run the following command to
add S1 to md0:
# mdadm – -add /dev/md0
/dev/hpdev/mylink-sde
The re-mirroring process is
initiated. When it is complete,
the extended distance cluster
detects the added mirror half
and accepts S1 as part of md0.
2. Enable P1 to run on Node 1 by
running the following
command:
# cmmodpkg -e P1 -n N1
Table 4-1 Disaster Scenarios and Their Handling (Continued)
Disaster Scenario
What Happens When
This Disaster Occurs
Recovery Process