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Configuring your Environment for Software RAID
Configuring the Package Control Script and RAID Configuration File
Chapter 382
Again, if the network is set up in such a way that when the links
between the sites fail, the communication links to the application
clients are also shut down, then the unintended writes are not
acknowledged and have no long term effect.
IMPORTANT The value you set for RPO_TARGET must be more than the value you
set for the RAID_MONITOR_INTERVAL parameter. By default, the
RAID_MONITOR_INTERVAL parameter is set to 30 seconds.
For example: RPO_TARGET=60 seconds
• MULTIPLE_DEVICES AND COMPONENT_DEVICES
Parameter RAID_DEVICE [ ] specifies the MD devices that are used
by a package. You must begin with RAID_DEVICE[0], and increment
the list in sequence. Component device parameters DEVICE_0[ ] and
DEVICE_1[ ] specify the component devices for the MD device of the
same index.
For example, if a package uses multiple devices such as
— md0 consisting of devices /dev/hpdev/sde and /dev/hpdev/sdf
and
— md1 consisting of devices /dev/hpdev/sdg1 and
/dev/hpdev/mylink-sdh1
use
# md0
RAID_DEVICE[0]=/dev/md0;
DEVICE_0[0]="/dev/hpdev/sde";
DEVICE_1[0]="/dev/hpdev/sdf"
#md1
RAID_DEVICE[1]=/dev/md1;
DEVICE_0[1]="/dev/hpdev/sdg1";
DEVICE_1[1]="/dev/hpdev/sdh1"
The MD RAID device names and the component device names must
be unique across the packages in the entire cluster.