Filter
Top Products
Disaster Scenarios and Their Handling
Chapter 4 87
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).
Access to S1 is lost from both
nodes, either due to power
failure to S1 or loss of FC links
to S1.
The package (P1) continues
to run on Node 1 with the
mirror that consists of only
S2.
Once you restore power to S1, or
restore the FC links to S1, the
corresponding mirror half of S1
(/dev/hpdev/mylink-sde) is
accessible from Node 1. To make
the restored mirrored half part of
the MD array, complete the
following procedure:
1. Run the following command to
remove the mirrored half from
the array:
# mdadm --remove /dev/md0
/dev/hpdev/mylink-sde
2. Run the following command to
add the mirrored half to the
array:
# 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.
Table 4-1 Disaster Scenarios and Their Handling (Continued)
Disaster Scenario
What Happens When
This Disaster Occurs
Recovery Process