NAME

       flashcache - overview of operation

SYNOPSIS

       modprobe flashcache

       Flashcache  consists  of  a  kernel  module  and userspace utilities.  The module is named
       "flashcache".   The  kernel  module   can   be   controlled   with   flashcache_create(8),
       flashcache_load(8) and flashcache_destroy(8) utilities.

DESCRIPTION

       Flashcache  is a block cache for Linux, built as a kernel module, using the device mapper.
       Flashcache  supports  writeback,  writethrough  and  writearound   caching   modes.    See
       flashcache_create(8) for a description of caching modes.

       Flascache  allows one to use a fast block device such as Solid State Drives (SSD) as cache
       to accelerate a slower drive used as backstore.

       Originally, Flashcache was built as a  block  device  cache  for  I/O  intensive  database
       applications,  for example to run an accelerated InnoDB store for mysqld(8), but it can be
       used as general purpose backend for filesystems as well.

USAGE

       Before using Flashcache, it might be a good idea to check if device mapper works properly.
       Assuming  the  partition  /dev/md0p1 shall be used as flash cache, one may try to create a
       linear device with following command:

       echo 0 1024 linear /dev/md0p1 0 | dmsetup create tmpdisk

       It this works, flashcache_create should be able to create its device.

       Remove tmpdisk with command:

       dmsetup remove tmpdisk

       Before creating a flashcache device using the flashcache_create command, the  deivce  must
       not be mounted.

SEE ALSO

       flashcache_create(8), flashcache_load(8), flashcache_destroy(8)

       README  and  other  documents  in  /usr/share/doc/flashcache-utils.   In  particular,  see
       flashcache-sa-guide.txt for configuring the flashcache kernel  module  through  its  /proc
       interface.

       The   flashcache   source   code   and   all   documentation   may   be   downloaded  from
       <https://github.com/facebook/flashcache/>.

AUTHORS

       Flashcache is developed by Mohan Srinivasan <mohan@fb.com>

       This man page was written by Dmitry Smirnov <onlyjob@member.fsf.org> for Debian  GNU/Linux
       (but may be used by others).