[dm-devel] [PATCH 0/4] dm-latency: Introduction

[Bryn M. Reeves]

On Thu, Feb 26, 2015 at 12:00:47PM -0500, Laurence Oberman wrote:
> Mikulas
> Thanks
> This came from customer asking for support for similar functionality in proprietary solutions such as PowerPath and HDLM.
> I had seen the information from Coly Li and asked if he could submit for comments.
> I will look into what can be done with what is is /sys/block/dm-xxx/stat

Those are just the basic diskstats counters (similar to /proc/diskstats).

You want to look at the stuff described in Documentation/device-mapper/dm-statistics.txt

Regards,
Bryn.