linux-kernel - Re: [2.6.31-rc1] device-mapper: target device sda6 is misaligned

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Date:	Thu, 25 Jun 2009 19:53:32 +0200
From:	Frans Pop <elendil@...net.nl>
To:	Mike Snitzer <snitzer@...hat.com>
Cc:	linux-kernel@...r.kernel.org, dm-devel@...hat.com,
	martin.petersen@...cle.com
Subject: Re: [2.6.31-rc1] device-mapper: target device sda6 is misaligned

On Thursday 25 June 2009, Mike Snitzer wrote:
> > I'm afraid those files don't exist on my systems (none of them: arm,
> > s390 and x86_64 notebook). Some kernel config option I'm missing
> > maybe?
>
> You should definitely have the topology attributes in the associated
> device's sysfs tree.

Ah, sorry. I'd switched back to .30 for the arm system because of this.
(And on the s390 box I looked for sda instead of dasdb; duh!)

Here are the values for arm:

$ cat /sys/block/sda/sda6/alignment_offset
0
$ cat /sys/block/sda/queue/physical_block_size
512
$ cat /sys/block/sda/queue/logical_block_size
512

And here's the lot for the s390 emulator:

# grep . /sys/block/dasdb/dasdb*/alignment_offset
/sys/block/dasdb/dasdb1/alignment_offset:0
/sys/block/dasdb/dasdb2/alignment_offset:0
# grep . /sys/block/dasdb/queue/physical_block_size
4096
# grep . /sys/block/dasdb/queue/logical_block_size
4096

# pvs -o +pe_start
  PV          VG     Fmt  Attr PSize   PFree 1st PE
  /dev/dasdb1 mordor lvm2 a-   388.00M    0  192.00K
  /dev/dasdb2 mordor lvm2 a-   388.00M    0  192.00K
# dmsetup ls
mordor-home     (254, 0)
# dmsetup table
mordor-home: 0 794624 linear 94:5 384
mordor-home: 794624 794624 linear 94:6 384

# fdasd -p /dev/dasdb
reading volume label ..: VOL1
reading vtoc ..........: ok

Disk /dev/dasdb:
  cylinders ............: 1113
  tracks per cylinder ..: 15
  blocks per track .....: 12
  bytes per block ......: 4096
  volume label .........: VOL1
  volume serial ........: 0X0121
  max partitions .......: 3

 ------------------------------- tracks -------------------------------
               Device      start      end   length   Id  System
          /dev/dasdb1          2     8346     8345    1  Linux native
          /dev/dasdb2       8347    16694     8348    2  Linux native
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