[linux-lvm] lvm and md

[William Blunn]

> I don't think it would be a good idea to put MD on top of LVM for
> reasons of performance. Ideally you want as few layers as possible on
> top of the disk.

Putting MD on top of LVM puts in one extra layer.

This layer will have to be traversed for every single access to the
disk.

Actually having a layer is unnecessary.

All that is necessary is to connect the MD to the right disk device
at the beginning when the MD is being started.

The MD is then connected to the disk with no intervening layers.

> As an alternative to Luca Berra's suggestion to use mdadm,
> it might be possible to do what you want using devfs.

Both of these suggestions address the problem of getting the MD
connected to the right disk at the beginning, without adding an
intervening layer.

Bill

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