[CentOS] rescan usb hd

[John Doe]

On Mon, 2009-09-21 at 17:05 -0700, Bazooka Joe wrote:
> I have a usb hd that I use for backup.  Occasionally it dies.
> If i unmount it and try to remount it it says sdc1 does not exist.

Not sure if related to your problem but I have many 'zombie' usb devices after mounting/unmounting a few times...

  # ll /dev/sd*
  brw-r----- 1 root disk 8,  0 Sep 17 11:45 /dev/sda*
  brw-r----- 1 root disk 8, 16 Sep 17 11:45 /dev/sdb*
  brw-r----- 1 root disk 8, 32 Sep 17 11:45 /dev/sdc
  brw-r----- 1 root disk 8, 48 Sep 17 11:45 /dev/sdd
  brw-r----- 1 root disk 8, 64 Sep 17 11:45 /dev/sde
  brw-r----- 1 root disk 8, 80 Sep 17 11:45 /dev/sdf
  brw-r----- 1 root disk 8, 96 Sep 17 11:45 /dev/sdg

  # rmmod usb_storage

  # ll /dev/sd*
  brw-r----- 1 root disk 8,  0 Sep 17 11:45 /dev/sda*
  brw-r----- 1 root disk 8, 16 Sep 17 11:45 /dev/sdb*

JD