Configuring your Environment for Software RAID
Configuring the Package Control Script and RAID Configuration File
| 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. |
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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. |
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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
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.
82 | Chapter 3 |
