[plug] Help! Can't stop mdadm from picking up hda1 on reboot

[Ari Finander]

> ----- Original Message -----
> From: "Ari Finander" <outrider at operamail.com>
> To: plug at plug.org.au
> Subject: [plug] Help! Can't stop mdadm from picking up hda1 on reboot
> Date: Sat, 21 Jan 2006 23:01:25 +0800
> 
> 
> Hi all,
> 
> I had a 200GB RAID1 array set up with mdadm on a Fedora Core 3 box, 
> but it ran out of free space. So, I am trying to separate the 
> drives, hda1 and hdc1, in order to double my storage space (I 
> already have a backup strategy in place to backup 400GB of data, 
> when I get to that point). I stopped /dev/md0 and changed 
> /etc/fstab to reflect the separate drives (mounted as /pub1 and 
> /pub2 now). However, when I reboot I get the error that /dev/hda1 
> is already mounted or /pub1 is busy (the first errors I got were  
> filesystem errors on /dev/hda1 which I fixed with fsck.ext3). 
> /dev/hdc1 automounts to /pub2 just fine! Each time I reboot I have 
> to do:
> mdadm -S /dev/md0
> mdadm -r /dev/hda1
> mount /dev/hda1
> in order to get /dev/hda1 to mount to /pub1
> 
> It may or may not be relevant, but after separating the drives and 
> formatting (mkfs.ext3 -j -m 0 /dev/hdc1) I ended up with errors 
> moving a directory to /pub2 (/dev/hdc1) where it reported that 
> /dev/hda1 was read only and it couldn't remove the files, although 
> it DID copy them all. This happened for the last 20GB out of 100GB 
> transfered to /pub2 (/dev/hdc1). It was after this that I ran the 
> hard drive manufacturers' diagnostics software on all drives 
> (including that which holds the root filesystem) and when I 
> rebooted it gave me the file system errors on /dev/hda1.
> 
> What am I doing wrong? Please help!?
> 
> Ari

I'm still not sure what caused the file system problem, so I'd like to hear any ideas about that and whether or not I should trust the data or try a cpio restore from backups.

However, I did fix the problem with /dev/hda1:

mdadm -S /dev/md0
mdadm --zero-superblock /dev/hda1

Cheers,

Ari


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