On Tue, Apr 30, 2013 at 4:24 AM, Gaurav Mahajan <gauravmahajan2007@gmail.com> wrote:

Hi Amit,

I had compiled some notes on my blog.
Here are some links on writing your own device mapper target.

http://techgmm.blogspot.in/p/writing-your-own-device-mapper-target.html

Concept of device mapper target.
http://techgmm.blogspot.in/p/device-mapper-layer-explored-every.html

Thanks,
Gaurav.

On Tue, Apr 30, 2013 at 5:05 AM, Anatol Pomozov <anatol.pomozov@gmail.com> wrote:

Hi

On Mon, Apr 29, 2013 at 9:51 AM, amit mehta <gmate.amit@gmail.com> wrote:
> On Sun, Apr 28, 2013 at 5:24 PM, Greg Freemyer <greg.freemyer@gmail.com> wrote:
>> A nice diagram of the overall storage subsystem is at http://www.thomas-krenn.com/en/oss/linux-io-stack-diagram.html
>>
>> Dm is just a single block in it, but it can help to see where it fits in overall.
>>
>> Btw: that diagram doesn't show the legacy ata driver that creates /dev/hdx style devices. Has that been dropped while I wasn't paying attention? I haven't used it in years, but I thought it was still used on embedded systems.
>>
>
> Thank you for sharing the link, but I'm looking for more
> detailed information on I/O stack in Linux, dm-mapper and
> multipath in particular.

Some docs about multipath can be found here

http://www.sourceware.org/lvm2/wiki/MultipathUsageGuide
http://christophe.varoqui.free.fr/refbook.html

The userspace part for tools is here
http://sourceware.org/lvm2/

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