[linux-lvm] move dm-integrity metadata to another PV

[Erwin van Londen]

Maybe an idea to add a cache volume to the LV?? Not 100% sure if this
works but would be nice to try.

On Sun, 2021-04-04 at 20:18 +0200, Sebastian Bachmann wrote:
> Hello,
> 
> I played around with the new dm-integrity integration in lvm.
> Unfortunately, it
> is very slow, as the checksums has to be written and read on - which
> is the
> price to pay obviously.
> 
> I thought that it might be a good idea to move the metadata to a fast
> disk,
> i.e., a SSD, however that is not possible and I get an error message
> on pvmove:
> 
> # pvmove -n r10_int_rimage_0_imeta /dev/sdd /dev/sda2
>   Unable to pvmove device used for raid with integrity.
> 
> I could not find a reason why this should not be done in theory, thus
> I guess
> that this is simply not supported by LVM right now?
> Or is there another reason why you should keep the metadata always on
> the same
> device?
> 
> Best,
> Sebastian
> 
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