Unix & Linux Stack Exchange is a question and answer site for users of Linux, FreeBSD and other Un*x-like operating systems. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

I want to experiment with mbcache kernel module, but I'm having trouble finding the documentation for it.

If I understood correctly, mbcache allows the use of a fast SSD disk to act as a transparent cache for much slower hard disks.

Where can I find the documentation?

I'm on Linux 3.0.0-17-generic #30-Ubuntu SMP x86_64

share|improve this question

Go for bcache now, not mbcache (kernels 3.10.x, 3.11.0)


share|improve this answer
Interesting. I wonder if bcache has good resilience after a power outage. One of the problems I face with flashcache is that it takes a fairly long time to flush the cache to my RAID set. A large cache may take longer than my UPS is able to sustain power to the system. However slight chance of this happening, it does influence the size of the cache that I can use. – jippie Aug 29 '13 at 6:05

There doesn't seem to be any documentation other than the source code itself. I wrote to Andreas Gruenbacher and referenced this question but have not received a reply.

share|improve this answer
I took a peek at the source code, but the comment isn't really helpful. The userland tools are not mentioned at all (but that is no surprise). Hopefully the mbcache project will share documentation shortly. – jippie Apr 19 '12 at 7:52

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.