Aggregated news from external sources
The rados block device (rbd) is looking pretty good at this point. The basic feature set:
Main items on the the to-do list:
The server side components are in place in both the v0.21 releases and the unstable branch. On the client side, there are two options.
First, qemu/kvm can be patched to map an rbd image as a block device. The code is available in git from
Alternatively, Wido has built some patched Ubuntu 10.4 packages for both qemu and libvirt, available from
The qemu/kvm patches will likely be included in the next major qemu release.
The native Linux kernel rbd kernel driver is also quite stable, but did not make it upstream for the 2.6.36 release cycle. We hope to have it in 2.6.37. The code for that is available at
The main hold up there is that the addition of rbd involves refactoring a lot of the common Ceph file system client code into a libceph module that is shared by both rbd and the file system client. This makes rebasing more difficult, so that branch may not have the most recent fixes in the master branch or the current -rc kernels. Also, the code reorganization completely breaks my semi-automated ceph-client-standalone.git updates, so for now you can’t clone and build it as a standalone module.