HP Serviceguard Extended Distance Cluster for Linux A.01.00 Deployment Guide, Second Edition, May 2008

Managing an MD Device
Starting the MD Device
Appendix A100
Starting the MD Device
After you create an MD device, you would need to stop and start the MD
device to ensure that it is active. You would not need to start the MD
device in any other scenario as this is handled by the XDC software.
To start the MD device, run the following command:
# mdadm -A -R <md_device_name>
<md_mirror_component_persistent_name_0>
<md_mirror_component_persistent_name_1>
Example A-2 Starting the MD Device /dev/md0
To start the MD device /dev/md0, run the following command:
# mdadm -A -R /dev/md0 /dev/hpdev/sde /dev/hpdev/sdf1
Following is an example of what the /proc/mdstat file contents will look
like once the MD is started:
[root@dlhct1 dev]# cat /proc/mdstat
Personalities : [raid1]
md0 : active raid1 sde[1] sdf[0]
9766784 blocks [2/2] [UU]
unused devices: <none>