> From: Ian Turner
> Sent: 09 May 2006 16:54
> 
> On Tuesday 09 May 2006 11:06, Jon LaBadie wrote:
> > > My autoloader is on /dev/st0 and tape are defined on /dev/nst0
> >
> > I don't think so.
> > st0 and nst0 are the "same" device handled differenly on close.
> 
> The changer is probably on /dev/sg0 or /dev/sg1. 

Yup - I would expect the device to use to talk to the changer to be of the form 
/dev/sgN.

There's a pair of useful utilities that come as part of the mtx RPM - 
loaderinfo and tapeinfo.  If you use these with your sg devices it will soon 
become clear which one is your changer.  Even if you  use loaderinfo on a 
device which points at a tape drive) or even a disk drive) it's pretty obvious 
what it is.  Here's output from one of my machines ...

# loaderinfo -f /dev/sg9
Product Type: Disk Drive
Vendor ID: 'COMPAQ  '
Product ID: 'BD300884C2      '
Revision: 'HPB7'
Attached Changer: No
Bar Code Reader: No
EAAP: No
Transport Geometry Descriptor Page: No
Device Configuration Page: No

# loaderinfo -f /dev/sg10
Product Type: Medium Changer
Vendor ID: 'HP      '
Product ID: 'MSL6000 Series  '
Revision: '0423'
Attached Changer: No
Bar Code Reader: Yes
EAAP: Yes
Number of Medium Transport Elements: 1
Number of Storage Elements: 58
Number of Import/Export Element Elements: 2
Number of Data Transfer Elements: 2
Transport Geometry Descriptor Page: Yes
Invertable: No
Device Configuration Page: Yes
Can Transfer: Yes

# loaderinfo -f /dev/sg11
Product Type: Tape Drive
Vendor ID: 'HP      '
Product ID: 'Ultrium 2-SCSI  '
Revision: 'F43W'
Attached Changer: No
Bar Code Reader: No
EAAP: No
Transport Geometry Descriptor Page: No
Device Configuration Page: No

Paul