Hello all, Apologies if this mail sounds annoying to you.
Sheepdog is a distributed object storage system for QEMU VM and RESTful services (in progress). Openstack users can make use of Sheepdog as Cinder and Glance storage as of now and Swift compatitable API is working in progress. Yuan will introduce sheepdog in the openstack Hong Kong summit and slides are already available at http://www.slideshare.net/multics/sheepdog-yet-another-all-inone-storage-for-openstack-27402520 You can see more info about this talk at http://openstacksummitnovember2013.sched.org/event/706dc3952a8917aa74998e047d015e6a#.UmZnNYYW31E Erasure coding is now seamlessly functional with all other features such as snapshot/clone/cluster-wide snapshot/multi-disk/auto-healing e.c with following characteristics: 1 Data is erasure coded automatically while being written to sheepdog storage, no extra operations. 2 Support random read/write, in-place-update, misaligned read/write 3 Support to run any type VM images or attach as a vdisk of a VM 4 User-defined coding scheme on a VDI basis 5 Better read/write performance compared to fully replication scheme 6 A single cluster can both support replicated VDI or erasure-coded VDI You can get more info at https://github.com/sheepdog/sheepdog/wiki for a general wiki https://github.com/sheepdog/sheepdog/wiki/Erasure-Code-Support for erasure coding Anyone who is interested can give it a try if you are confortable with command line: $ git clone https://github.com/sheepdog/sheepdog.git For a 10 minutes quick start with a single machine, you can try: (Assume you are debian based system) # Compile from the source $ sudo apt-get install liburcu-dev $ git clone git://github.com/sheepdog/sheepdog.git $ cd sheepdog $ ./autogen.sh; ./configure --disable-corosync $ make; sudo make install # Create a 6 node cluster with local driver $ for i in `seq 0 5`; do sheep /tmp/store$i -n -c local -z $i -p 700$i;done $ dog cluster format # Create a replicated thin-provisioned 20G volume with 3 copies $ dog vdi create -c 3 replica 20G $ dog vdi list # show vdi list $ dog node info # show node information $ dog cluster info # show cluster infomation # Create a erasure-coded (4 data strips and 2 parity strips) 20G volume $ dog vdi create -c 4:2 erasure 20G # Now you should have 2 vdi created $ dog vdi list # You can install OS on these volumes with upstream QEMU $ qemu-system-x86_64 -m 1024 --enable-kvm \ -drive file=sheepdog:erasure,if=virtio -cdrom path_to_your_iso # or attach the volumes with existant VM $ qemu-system-x86_64 -m 1024 --enable-kvm \ -drive file=your_image,if=virtio -drive file=sheepdog:erasure,if=virtio # Take a live disk-only snapshot of running VM $ dog vdi snapshot -s tag erasure # Mount the volume(vdi) to local storage file system $ sheepfs dir $ echo erasure > dir/vdi/mount # then you can do whatever with the mounted file at dir/vdi/volume/erasure Have fun And feedbacks are always welcome. Thanks Yuan _______________________________________________ OpenStack-dev mailing list OpenStack-dev@lists.openstack.org http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev