raid device or resource busy

[physics21]

I had installed a raid on scientific linux a few weeks ago. Today all of a sudden the hard drives no longer appear with df -h.
Now I am trying to rereate them using:
mdadm --create /dev/md0 --level=raid1 --raid-devices=2 /dev/sdb1 /dev/sdc1

but when I run it I get:
mdadm: cannot open /dev/sdb1: Device or resource busy

It is not being used by anything so I thought it was maybe dmraid but I removed it and still nothing changed. Do you need to update something after removing dmraid?

Thanks for any help I greatly appreciate it!

[tux99]

what does the output of cat /proc/mdstat look like? Any sign of /dev/sdb1 there?
And what about the output of mount|grep /dev/sdb1 ?

This post has been edited by tux99: Jul 9 2016, 03:36 PM

[physics21]

QUOTE (tux99 @ Jul 9 2016, 03:35 PM)

what does the output of cat /proc/mdstat look like? Any sign of /dev/sdb1 there? And what about the output of mount|grep /dev/sdb1 ?

Here is what I get when I do cat /proc/mdstat:
Personalities : [raid1]
md0 : active raid1 sdc1[1] sdb1[0]
1953380928 blocks super 1.2 [2/2] [UU]
bitmap: 0/15 pages [0KB], 65536KB chunk

When I do mount|grep /dev/sdb1 I get nothing.

[Bluejay]

QUOTE (physics21 @ Jul 11 2016, 11:40 AM)

md0 : active raid1 sdc1[1] sdb1[0]

Which indicates that /dev/sdb1 is in a RAID 1 (mirror) set with /dev/sdc1. What is the expected configuration?

[ralf]

Hi,

If you run SL6.8: this type of incident might have been described and addressed with updates TUV published July 13th. I remember the changelog in autofs (for example: fix handle_mounts() termination condition check)

Cheers,

Ralf