nixCraft

hi,
I have created /dev/md0 with two partions /dev/sda5 and /dev/sda6. Now, i have set /dev/sda6 as faulty and removed the device (using -f and -r options). Now i typed
mdadm --detail /dev/md0 it is showing /dev/sda5 is active. Now,i want to remove /dev/sda5 also so i have set /dev/sda5 as faulty. but i am unable to remove the device so i have stopped the /dev/md0 ( mdadm -S /dev/md0). Here are my questions for you :
1)How to start /dev/md0 device (Note: The device is currently stopped)
2)How to remove /dev/md0 completely from the system.

Any help in this regard is appreciated.....
Thanks,
Pavan.

Hi,

The answers for your questions are gioven below:

1)How to start /dev/md0 device (Note: The device is currently stopped)

You have to start the raid device /dev/md0 with only one current active device /dev/sda5 by using the command

#mdadm --assemble /dev/md0 /dev/sda5 -m0 --run
it will throw an error like raid device will not work properly as it needs min 2 devices.

But when you do mdadm --detail /dev/mdadm
it will show /dev/sda5 as active device in /dev/md0

Please try the above step and let us know.

2)How to remove /dev/md0 completely from the system.

now set /dev/sda5 as faulty and remove the device using the below commands:

mdadm -f /dev/md0 /dev/sda5
mdadm -r /dev/md0 /dev/sda5

mdadm --detail /dev/md0
mdadm --stop /dev/md0

hi,
Thanks for your help and sorry for the dealyed response.
I have tried in the following way

mdamd -Af /dev/md0 /dev/sda{5,6} and raid is started.

-A for assembling
-f for forcefully.

This worked fine for me.

Thanks
Pavan.