Re: [PATCH] 4/6: scsi_allow_ghost_devices

[Doug Ledford <dledford@redhat.com>]

On Mon, 2004-04-19 at 03:34, Arjan van de Ven wrote:
> > I'm very unhappy with that.  Could you explain why EMC needs this?
> > And even if we have to work around it I'd rather use the blacklist mechanism
> > for this.
> 
> they allow the admin to config the box without a lun 0....
> I 100% agree it's blacklist material.

Actually, the original reason for the patch was the fact that some
external boxes use LUN 0 as a control device that you send commands to
in order to init logical volumes.  Without access to the control device
(which previously was always shown as offline), you couldn't set the box
up with any linux tools, you would have to set up the logical volumes
under Windows then boot into linux to see them.  Since the LUN 0 device
wasn't really offline, but instead was reported as a disk device with no
attached physical device, this patch was created to allow the linux
kernel to send commands to the control device.

-- 
  Doug Ledford <dledford@redhat.com>     919-754-3700 x44233
         Red Hat, Inc.
         1801 Varsity Dr.
         Raleigh, NC 27606