> Do you have an active md array?
>
> mdadm -S /dev/md0
Nothing was showing up in /proc/mdstat, but when I try and stop md0, I get this
# mdadm -S /dev/md0
mdadm: stopped /dev/md0
> lsof | egrep '(sdb|sdc)'
I had tried that before, and nothing is showing. A reboot didn't help, but
something is definately keeping it open. I tried an mkfs
]# mkfs.ext3 /dev/sdb1
mke2fs 1.39 (29-May-2006)
/dev/sdb1 is apparently in use by the system; will not make a filesystem here!
Any ideas how to find out what has it open? I can happily write all over the
disk with dd... I can create and delete the partition, and it's all good... I
will try deleting the sd{b,c}1 partitions, reboot, and see what happens.
Graham
----- Original Message ----
From: Justin Piszcz <[EMAIL PROTECTED]>
To: jahammonds prost <[EMAIL PROTECTED]>
Cc: linux-raid@vger.kernel.org
Sent: Sunday, 25 February, 2007 5:35:33 PM
Subject: Re: trouble creating array
On Sun, 25 Feb 2007, jahammonds prost wrote:
> Just built a new FC6 machine, with 5x 320Gb drives and 1x 300Gb drive. Made a
> 300Gb partition on all the drives /dev/hd{c,d,e} and /dev/sd{a,b,c}... Trying
> to create an array gave me an error, since it thought there was already an
> array on some of the disks (and there was an old one).
>
> I decided to clear off the superblock on the drives with mdadm
> --zero-superblock on all the drives. It worked fine on all drives, except for
> /dev/sd{b,c)1, which returns an error "mdadm: Couldn't open /dev/sdb1 for
> write - not zeroing". There doesn't seem to be a problem with the drive, as
> I've run a non destructive badblocks on it, and also done a dd if=/dev/zero
> of=/dev/sdb1 on it, and Ive written out 300Gb onto the partition.
>
> When I try and create an array using these 2 partitions, I get an error
>
> mdadm: Cannot open /dev/sdb1: Device or resource busy
> mdadm: Cannot open /dev/sdc1: Device or resource busy
>
> and it aborts. I've double checked that the drives aren't mounted anywhere.
> There's nothing in /var/log/messages either...
>
> Any suggestions where to check next?
>
>
>
> Graham
>
>
>
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Do you have an active md array?
mdadm -S /dev/md0
mdadm -S /dev/md1
mdadm -S /dev/md2
.. etc
lsof | egrep '(sdb|sdc)'
Something thinks its in use, that is why you cannot format it/make it part
of a new array, a reboot would also fix the problem.
Justin.
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