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RE: [dm-devel] Bug? Determining the holders of partitions shadowed by dm-multipath.



good point. sorry.
The partition's parent's device number will be in the dmsetup deps list.
/dev/sda2 is a partition; dmsetup deps will list its parent's, /dev/sda, major:minor as a dependency of the mpath device .

kludgy.

> -----Original Message-----
> From: dm-devel-bounces redhat com [mailto:dm-devel-bounces redhat com]
> On Behalf Of Joel Becker
> Sent: Tuesday, February 10, 2009 4:33 PM
> To: device-mapper development
> Subject: Re: [dm-devel] Bug? Determining the holders of partitions
> shadowed by dm-multipath.
>
> On Tue, Feb 10, 2009 at 09:49:58AM -0500, Romanowski, John (OFT) wrote:
> > my sles10sp2 at 2.6.16.60-0.29-default doesn't have the
> /sys/block/.../holders but
> > I've used major:minor device numbers from commands
> > dmsetup ls
> > and
> > dmsetup deps
> > to resolve such device relationships.
> >
> > A 'dmsetup ls' device number that isn't listed in 'dmsetup deps'
> device numbers is a top-level device. Example below: mproot-part1 (dev
> 253:3, a partition of mp device 253:2) isn't listed as a dependency of
> any device. Likewise each listed LVM volume isn't listed as a
> dependency of any device; example- rootvg-tmp 253:10
>
>       Sure, but a /dev/sda2 won't show up in dmsetup output anywhere.
> That's kind of my point.
>
> Joel
>
> --
>
> Life's Little Instruction Book #198
>
>       "Feed a stranger's expired parking meter."
>
> Joel Becker
> Principal Software Developer
> Oracle
> E-mail: joel becker oracle com
> Phone: (650) 506-8127
>
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