--On Sunday, March 07, 2004 23:10:40 -0600 Michael D Schleif <mds AT helices 
DOT org> wrote:

> Amanda 2.4.4p1
> Debian Linux
> 
> I finally took the plunge yesterday, and upgraded my last system to
> kernel 2.6.3.
> 
> Unfortunately, this is my amanda backup server, and under this kernel it
> no longer communicates with /dev/nst0:
> 
>    # sudo mt -f /dev/nst0 offline
>    mt: No such device. Cannot open '/dev/nst0'.
> 
> Everything else appears to work as expected.  I didn't notice this tape
> problem until this morning, I saw the backup was stuck on holdingdisk.
> 
> Running following results in `0' tape devices found:
> 
>    # sudo /etc/init.d/mt-st modload
> 
> Regardless of kernel, I see this:
> 
>    # cat /proc/scsi/scsi
>    Attached devices:
>    Host: scsi0 Channel: 00 Id: 05 Lun: 00
>      Vendor: HP       Model: C1537A           Rev: L812
>      Type:   Sequential-Access                ANSI SCSI revision: 02
>    . . .
> 
> Now, after reboot back into 2.4.25, /dev/nst0 is working fine, and I am
> flushing last night's backup to tape as I compose this.
> 
> I have searched the archives and Google; but, the string `st' is very
> common, and I probably have not found the optimal search string ;>
> 
> What do you think?

It looks to me like you either didn't build your new kernel with SCSI tape
support or the module isn't loading for some reason. I have two Amanda
servers running 2.6 kernels and both work fine using st (although I usually
build static kernels instead of using modules).  Check the system logs
when you load the module and see if it reports any errors.
  If you have a changer, don't forget to build in support for the sg
(SCSI generic) driver and include the option to probe for multiple LUNS.

Frank

> 
> -- 
> Best Regards,
> 
> mds
> mds resource
> 877.596.8237
> -
> Dare to fix things before they break . . .
> -
> Our capacity for understanding is inversely proportional to how much
> we think we know.  The more I know, the more I know I don't know . . .
> --