It's been a while, but v0.21 is ready. Most of the work this time
around has been on stability. There is one key new feature, however: RBD,
the rados block device, which let you create a virtual disk backed by
objects stored in the Ceph cluster. The images can be mapped natively by
the ceph kernel module or via a driver in qemu/KVM. Although neither of
those drivers is upstream yet, the server side functionality and admin
tools are in place.
Changes since v0.20 include:
* improved logging infrastructure
* log rotate
* mkfs improvements
* rbd tool, and rados class
* mds: return ENOTEMPTY when removing directory with snapshots
* mds: lazy io support (experimental)
* msgr: send messages directory to connection handles (more efficient)
* faster atomic_t via libatomic-ops
* mon: recovery improvements, fixes (e.g. when one mon is down for a
long time)
* mon: warn on monitor clock drift
* osd: large object support
* osd: heartbeat improvements, fixes
* osd: journaling fixes, improvements (bugs, better use of direct io)
* osd: snapshot rollback op (for rbd)
* radosgw fixes, improvements
* many memory leaks and other bugs fixed
The project roadmap has been updated and is available via the issue
tracker at
http://tracker.newdream.net/projects/ceph/roadmap
Relevant URLs:
* Direct download at http://ceph.newdream.net/download/ceph-0.21.tar.gz
* For Debian packages see http://ceph.newdream.net/wiki/Debian
sage
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