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

Frans Pop
2009-06-25T17:53:40Z

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