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

[Laurence Oberman <loberman@redhat.com>]

On My DAT tape with the latest patch


[root@srp-server ~]# cat /sys/class/scsi_tape/st0/device/scsi_level
4

[root@srp-server ~]# mt -f /dev/st0 stsetoption can-partitions

Jan 28 18:17:49 srp-server kernel: st 6:0:1:0: [st0] Block limits 1 - 16777215 bytes.
Jan 28 18:17:49 srp-server kernel: st 6:0:1:0: [st0] Mode sense. Length 11, medium 0, WBS 10, BLL 8
Jan 28 18:17:49 srp-server kernel: st 6:0:1:0: [st0] Density 47, tape length: 0, drv buffer: 1
Jan 28 18:17:49 srp-server kernel: st 6:0:1:0: [st0] Block size: 0, buffer size: 4096 (1 blocks).
Jan 28 18:17:49 srp-server kernel: st 6:0:1:0: [st0] Mode 0 options: buffer writes: 1, async writes: 1, read ahead: 1
Jan 28 18:17:49 srp-server kernel: st 6:0:1:0: [st0]     can bsr: 1, two FMs: 0, fast mteom: 0, auto lock: 0,
Jan 28 18:17:49 srp-server kernel: st 6:0:1:0: [st0]     defs for wr: 0, no block limits: 0, partitions: 1, s2 log: 0
Jan 28 18:17:49 srp-server kernel: st 6:0:1:0: [st0]     sysv: 0 nowait: 0 sili: 0 nowait_filemark: 0
Jan 28 18:17:49 srp-server kernel: st 6:0:1:0: [st0]     debugging: 1
Jan 28 18:17:49 srp-server kernel: st 6:0:1:0: [st0] Rewinding tape.

[root@srp-server ~]# mt -f /dev/st0 mkpartition 1000

Jan 28 18:18:01 srp-server kernel: st 6:0:1:0: [st0] Block limits 1 - 16777215 bytes.
Jan 28 18:18:01 srp-server kernel: st 6:0:1:0: [st0] Mode sense. Length 11, medium 0, WBS 10, BLL 8
Jan 28 18:18:01 srp-server kernel: st 6:0:1:0: [st0] Density 47, tape length: 0, drv buffer: 1
Jan 28 18:18:01 srp-server kernel: st 6:0:1:0: [st0] Block size: 0, buffer size: 4096 (1 blocks).
Jan 28 18:18:01 srp-server kernel: st 6:0:1:0: [st0] Loading tape.
Jan 28 18:18:01 srp-server kernel: st 6:0:1:0: [st0] Error: 8000002, cmd: 0 0 0 0 0 0
Jan 28 18:18:01 srp-server kernel: st 6:0:1:0: [st0] Sense Key : Unit Attention [current]
Jan 28 18:18:01 srp-server kernel: st 6:0:1:0: [st0] Add. Sense: Not ready to ready change, medium may have changed
Jan 28 18:18:01 srp-server kernel: st 6:0:1:0: [st0] Block limits 1 - 16777215 bytes.
Jan 28 18:18:01 srp-server kernel: st 6:0:1:0: [st0] Mode sense. Length 11, medium 0, WBS 10, BLL 8
Jan 28 18:18:01 srp-server kernel: st 6:0:1:0: [st0] Density 47, tape length: 0, drv buffer: 1
Jan 28 18:18:01 srp-server kernel: st 6:0:1:0: [st0] Block size: 0, buffer size: 4096 (1 blocks).
Jan 28 18:18:01 srp-server kernel: st 6:0:1:0: [st0] Partition page length is 10 bytes.
Jan 28 18:18:01 srp-server kernel: st 6:0:1:0: [st0] PP: max 1, add 0, xdp 0, psum 02, pofmetc 0, rec 03, units 00, sizes: 0 65535
Jan 28 18:18:01 srp-server kernel: st 6:0:1:0: [st0] MP: 11 08 01 00 10 03 00 00 00 00 ff ff
Jan 28 18:18:01 srp-server kernel: st 6:0:1:0: [st0] psd_cnt 2, max.parts 1, nbr_parts 0
Jan 28 18:18:01 srp-server kernel: st 6:0:1:0: [st0] Formatting tape with two partitions (1 = 1000 MB).
Jan 28 18:18:01 srp-server kernel: st 6:0:1:0: [st0] Sent partition page length is 12 bytes. needs_format: 0
Jan 28 18:18:01 srp-server kernel: st 6:0:1:0: [st0] PP: max 1, add 1, xdp 1, psum 02, pofmetc 0, rec 03, units 00, sizes: 65535 1000
Jan 28 18:18:01 srp-server kernel: st 6:0:1:0: [st0] MP: 11 0a 01 01 30 03 00 00 ff ff 03 e8
Jan 28 18:18:01 srp-server kernel: st 6:0:1:0: [st0] Error: 8000002, cmd: 15 10 0 0 18 0
Jan 28 18:18:01 srp-server kernel: st 6:0:1:0: [st0] Sense Key : Illegal Request [current]
Jan 28 18:18:01 srp-server kernel: st 6:0:1:0: [st0] Add. Sense: Invalid field in parameter list
Jan 28 18:18:01 srp-server kernel: st 6:0:1:0: [st0] Partitioning of tape failed.
Jan 28 18:18:01 srp-server kernel: st 6:0:1:0: [st0] Rewinding tape.



Laurence Oberman
Principal Software Maintenance Engineer
Red Hat Global Support Services

----- Original Message -----
From: "Shane M Seymour" <shane.seymour@hpe.com>
To: "Kai Mäkisara (Kolumbus)" <kai.makisara@kolumbus.fi>
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 6:12:41 PM
Subject: RE: What partition should the MTMKPART argument specify? Was: Re: st driver doesn't seem to grok LTO partitioning

Hi Kai,

$ pwd
/sys/class/scsi_tape/st1/device
$ cat scsi_level
4

Thanks
Shane

> -----Original Message-----
> From: "Kai Mäkisara (Kolumbus)" [mailto:kai.makisara@kolumbus.fi]
> Sent: Friday, January 29, 2016 4:04 AM
> To: Seymour, Shane M
> Cc: Laurence Oberman; Emmanuel Florac; Laurence Oberman; linux-
> scsi@vger.kernel.org
> 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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