[linux-lvm] Re: IBM to release LVM Technology to the Linux

[benr at us.ibm.com]

Martin,

>I am advocating:
>
>1. Using existing partitioning schemes to encapsulate logical disks.
>
>   This is only relevant in the migration case and if people want to
>   test LVMS on a few disks that are already partitioned.  If your
>   system has hundreds of disks connected, you'll use a 1:1 physical
>   to logical disk mapping anyway.

What you wish to do here can be done within the LVMS Architecture.
Basically, it would require the creation of a Device Manager plug-in which
would report each partition on a device as a logical disk.  Once this is
done, all of the other LVMS Partition Management and Feature plug-ins could
be applied to the logical disk.


>2. Avoid using existing partitioning schemes to encapsulate logical
>   partitions/extents.

This could be accomplished in the LVMS Architecture by creating a Partition
Manager plug-in which implements whatever scheme you desire.  Furthermore,
it could co-exist with other Partition Manager plug-ins.  The only
constraint is that a logical disk can not be shared between multiple
Partition Manager plug-ins.

I believe that what you advocate could be implemented within the LVMS
Architecture.   Since it is not an exact match for the model underlying the
architecture, it would not be a perfect fit, but it wouldn't be a bad fit
either.  Thoughts?

Regards,

Ben