On Sun, Dec 4, 2011 at 18:22, loody <miloody at gmail.com> wrote: > Dear all: > Is there any document which explain what "backing device" used for? such as "backing block device" in caching? -- regards, Mulyadi Santosa Freelance Linux trainer and consultant blog: the-hydra.blogspot.com training: mulyaditraining.blogspot.com