Disk is apparently in use by the system

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Posted by Shaun on Server Fault See other posts from Server Fault or by Shaun
Published on 2012-07-10T21:14:40Z Indexed on 2012/07/10 21:17 UTC
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I've just fitted two disks to my home server. I'm trying to format and then raid them but I'm getting a problem that hours of Googling hasn't resolved this.

The error that I'm getting is:

# 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!

# df -h
  Filesystem            Size  Used Avail Use% Mounted on
  /dev/sda1             4.0G  1.9G  2.0G  49% /
  none                  380M     0  380M   0% /dev/shm
  /opt/xensource/packages/iso/XenCenter.iso
                        51M   51M     0 100% /var/xen/xc-install

# mount -t ext3 /dev/sdb1 /mnt/b
  mount: /dev/sdb1 already mounted or /mnt/b busy

I'm new to this and it's got me beat. I wouldn't ask if I hadn't done my research first. Thanks.

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