Re: What partition should the MTMKPART argument specify? Was: Re: st driver doesn't seem to grok LTO partitioning

[Laurence Oberman <loberman@redhat.com>]

Hi Kai

What kernel was the last patch you attached against.

Thanks

Laurence Oberman
Principal Software Maintenance Engineer
Red Hat Global Support Services

----- Original Message -----
From: "Kai Mäkisara (Kolumbus)" <kai.makisara@kolumbus.fi>
To: "Shane M Seymour" <shane.seymour@hpe.com>
Cc: "Laurence Oberman" <loberman@redhat.com>, "Emmanuel Florac" <eflorac@intellique.com>, "Laurence Oberman" <oberman.l@gmail.com>, linux-scsi@vger.kernel.org
Sent: Thursday, January 28, 2016 12:04:20 PM
Subject: Re: What partition should the MTMKPART argument specify? Was: Re: st driver doesn't seem to grok LTO partitioning


> On 28.1.2016, at 9.36, Seymour, Shane M <shane.seymour@hpe.com> wrote:
> 
> Hi Kai,
> 
> With the changes the I get a failure partitioning a HP DAT72 drive (DDS-5):
> 
> # ./mt -f /dev/st1 stsetoption debug
> # ./mt -f /dev/st1 stsetoption can-partitions
> # ./mt -f /dev/st1 mkpartition 1000
> /dev/st1: Input/output error
> 
...
> [ 3976.389605] st 6:0:3:0: [st1] Partition page length is 10 bytes.
> [ 3976.389610] st 6:0:3:0: [st1] PP: max 1, add 0, xdp 0, psum 02, pofmetc 0, rec 03, units 00, sizes: 0 65535
> [ 3976.389614] st 6:0:3:0: [st1] MP: 11 08 01 00 10 03 00 00 00 00 ff ff
> [ 3976.389618] st 6:0:3:0: [st1] psd_cnt 2, max.parts 1, nbr_parts 0
                                                     ^^^^^^^^^
The problem is here

...
> Using a slightly older kernel to partition the DAT72 drive works (same 3 commands as above):
...
> [  351.584906] st 6:0:3:0: [st1] Partition page length is 10 bytes.
> [  351.584908] st 6:0:3:0: [st1] psd_cnt 1, max.parts 1, nbr_parts 0

The old driver computes the psd_cnt from the returned page length. The same applies
to the patched driver if the SCSI level of the device < SCSI_3. This works correctly with
my drive that reports SCSI_2. So, the question is: what SCSI level does your device
report?

Kai

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