[dm-devel] Device-mapper target driver for Write tracking

[Zdenek Kabelac]

Dne 19.10.2016 v 12:53 Daniel Armbruster napsal(a):
> Hi List,
>
> I'm looking for a device-mapper target driver giving me the possibility to
> track/log WRITE requests. The idea is to track those WRITE requests within a
> Bitmap e.g. 1:LV-EXTEND (for LVM2). I read already the device-mapper
> documentation under
>
> https://www.kernel.org/doc/Documentation/device-mapper/
>
> but didn't find an appropriate module which would suite my needs.
>
> Is there any work happening on this to leverage? Any kind of help is
> appreciated.
>
> Many thanks in advance.


Hi


Not exactly sure what you are trying to do but 2 things to look at:

Maybe  'dmstats' with it's region logic may cover your 'wanted' operation.

The kernel dm target to check would be  'era' which keeps trace
of written blocks.

Regards

Zdenek