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List:       ceph-devel
Subject:    [ceph-devel] [ANNOUNCE] Ceph distributed file system v0.2
From:       Sage Weil <sage () newdream ! net>
Date:       2008-05-07 22:32:57
Message-ID: Pine.LNX.4.64.0804291419280.15314 () cobra ! newdream ! net
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Hello everyone,

Ceph is a distributed file system designed for performance, reliability, 
and scalability.  Basic features include:

 * POSIX semantics
 * Seamless scaling from 1 to many thousands of nodes
 * No single point of failure
 * N-way replication of data across storage nodes
 * Fast recovery from node failures
 * Automatic rebalancing of data on node addition/removal
 * Easy deployment: most FS components are userspace daemons
 * Linux kernel client, FUSE-based client, and user library

Notable in this release is a reasonably stable Linux kernel client.  It 
can extract and compile a kernel, and passes all tests in the fstest POSIX 
regression test suite posted a few weeks back.  It has stabilized to the 
point where it could use some broader testing and code review.

More info at

	http://ceph.newdream.net

Source code at

	git://ceph.newdream.net/ceph.git
	http://ceph.newdream.net/git

Since v0.1:

 * fully functional (and reasonably stable) kernel client
 * NFS re-export of a ceph client mount
 * client metadata leases to keep client cache coherent 
 * crushtool for managing storage cluster topology
 * improved support for storage cluster expansion
 * some new tools for mkfs and management
 * lots and lots of bug fixes...

Planned for v0.3:

 * xattrs
 * hardening distributed failure recovery
 * large directory support (in client)
 * recursive mtime and file size accounting

Some key things on the (medium- to long-term) roadmap:

 * locks
 * quotas
 * btrfs for local object storage on storage nodes
 * directory-granularity snapshots
 * content-addressible storage
 * strong security

sage

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