[Gllug] Tape drive

[Adrian McMenamin]

On Wed, 2006-04-12 at 22:07 +0100, Mike Brodbelt wrote:
> On Wed, 2006-04-12 at 21:47 +0100, Adrian McMenamin wrote:
> > Not sure how to do this because I am not sure what are the right things
> > to ask google (the obvious stuff like "how do I detect my DDS2 drive in
> > linux" and similar variants don't seem to work). So here goes...
> > 
> > Have an ancient hunk of iron which is a very noisy dual pentium 2/333
> > box of little use. But it does have a HP SCSI DDS2 tape drive that I'd
> > like to play with.
> > 
> > I have now installed ubuntu on this thing and it doesn't seem to
> > acknowledge the existence of the two devices on the second scsi card (ie
> > the cdrom and the tape drive) though the hard disks - all on scsi0 are
> > seen.
> > 
> > Of course I installed ubuntu from the cdrom and tape drive certainly
> > seems alive when I put a tape in.
> > 
> > How do I detect/configure these things. What should I look for...
> 
> You need to have the st module loaded, or compiled in. You should get
> something like:-
> 
> 
> scsi1 : Adaptec AIC7XXX EISA/VLB/PCI SCSI HBA DRIVER, Rev 7.0
>         <Adaptec 2940 Ultra SCSI adapter>
>         aic7880: Ultra Single Channel A, SCSI Id=7, 16/253 SCBs
> 
>   Vendor: HP        Model: C1557A            Rev: U610
>   Type:   Sequential-Access                  ANSI SCSI revision: 02
>  target1:0:5: Beginning Domain Validation
>  target1:0:5: FAST-10 SCSI 10.0 MB/s ST (100 ns, offset 15)
>  target1:0:5: Domain Validation skipping write tests
>  target1:0:5: Ending Domain Validation
>   Vendor: HP        Model: C1557A            Rev: U610
>   Type:   Medium Changer                     ANSI SCSI revision: 02
>  target1:0:5: FAST-10 SCSI 10.0 MB/s ST (100 ns, offset 15)
> st: Version 20050830, fixed bufsize 32768, s/g segs 256
> st 1:0:5:0: Attached scsi tape st0<4>st0: try direct i/o: yes (alignment 512 B), max page reachable by HBA 1048575
> 
> when you boot the machine. Equally, it should be there if you
> cat /proc/scsi/scsi:-
> 
> Host: scsi1 Channel: 00 Id: 05 Lun: 00
>   Vendor: HP       Model: C1557A           Rev: U610
>   Type:   Sequential-Access                ANSI SCSI revision: 02
> 
> 
> Note the "Sequential Access" bit - disks should all show up as "Direct
> Access". Finally, you should be able do do stuff with mt, even when
> there's no tape in the drive:-
> 
> # mt -f /dev/st0 datcompression
> Compression on.
> Compression capable.
> Decompression capable.
> mt: /dev/st0: No medium found
> 
> 

Seems to work:


root at noisybox:~# mt -f /dev/st0 status
drive type = Generic SCSI-2 tape
drive status = 603979776
sense key error = 0
residue count = 0
file number = 0
block number = 0
Tape block size 0 bytes. Density code 0x24 (DDS-2).
Soft error count since last status=0
General status bits on (41010000):
 BOT ONLINE IM_REP_EN



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