Ceph - a scalable distributed file system
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Please see http://ceph.newdream.net/ for current info.

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To build the Linux kernel client,

$ cd src/kernel
$ make
or
$ make KERNELDIR=/path/to/linux
$ insmod ceph.ko
$ mount -t ceph 1.2.3.4:/ /mnt/ceph
...

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To build the server daemons, and FUSE client,

$ ./autogen.sh
$ ./configure
$ cd src
$ make

(Note that the FUSE client will only be built if libfuse is present.)

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A quick summary of binaries that will be built in src/

daemons:
 cmon -- monitor daemon.  handles cluster state and configuration
         information.
 cosd -- storage daemon.  stores objects on a given block device.
 cmds -- metadata daemon.  handles file system namespace.
 cmonctl -- send commands to the monitor cluster.

userland clients:
 cfuse -- fuse client.
 csyn -- synthetic workload generator client.

tools:
 mkmonfs -- create a fresh monfs (for a new filesystem)
 monmaptool -- create/edit mon map
 osdmaptool -- create/edit osd map 
 crushtool -- create/edit crush map
 dupstore -- duplicate an osd object store (offline)

development/debugging:
 fakesyn -- simulator with synthetic workload
 fakefuse -- simulator that mounts with fuse

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see also src/README