On Mon, Apr 29, 2013 at 12:51 PM, amit mehta <gmate.amit@xxxxxxxxx> wrote: > On Sun, Apr 28, 2013 at 5:24 PM, Greg Freemyer <greg.freemyer@xxxxxxxxx> 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. I actually assumed others would step in. I haven't seen any dm docs outside the kernel tree, but I haven't done and dm work. I guess you know dm-cache just went into the kernel: http://lwn.net/Articles/540996/ The primary use case is to use SSD (or similar fast storage) as a cache for a rotating disk. I assume you found this very old (and simple) article, but I doubt it is useful 8 years later: http://lwn.net/Articles/124703/ For more useful links, I often go to wikipedia and follow the links: You should find: multi-path faq: http://christophe.varoqui.free.fr/faq.html multi-path policies: http://christophe.varoqui.free.fr/policies.html multi-path diagrams: http://christophe.varoqui.free.fr/graphics/ multi-path reference: http://christophe.varoqui.free.fr/refbook.html Greg _______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
