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/