sheepdog ppt 中文ppt

Sheepdog: Distributed Storage System for KVM============================================Overview--------Sheepdog is a distributed storage system for KVM/QEMU. It provideshighly available block level storage volumes to virtual machines. Sheepdog supports advanced volume management features such as snapshot,cloning, and thin provisioning. The architecture of Sheepdog is fullysymmetric; there is no central node such as a meta-data server.Sheepdog is an Open Source software, released under the terms of theGNU General Public License version 2. For the latest information about Sheepdog, please visit our website at:   Requirements------------* Three or more x86-64 machines* Corosync cluster engineInstall-------Please read the INSTALL file distributed with this package for detailedinstructions on installing or compiling from source.Usage-----* Configure corosync.  Reference the corosync(8) and corosync.conf(5) man page  for further details.* Setup Sheepdog   1. Launch sheepdog on each machines of the cluster.      $ sheep /store_dir      Notes:        /store_dir is a directory to store objects. The directory must        be on the filesystem with an xattr support. In case of ext3, you        need to add 'user_xattr' to the mount options.        $ sudo mount -o remount,user_xattr /store_device   2. Make fs      $ collie cluster format --copies=3      --copies specifies the number of default data redundancy. In this case,      the replicated data is stored on three machines.   3. Check cluster state      Following list shows that Sheepdog is running on 32 nodes.      $ collie node list        Idx	Node id (FNV-1a) - Host:Port      ------------------------------------------------        0	0308164db75cff7e - 10.68.13.15:7000      * 1	03104d8b4315c8e4 - 10.68.13.1:7000        2	0ab18c565bc14aea - 10.68.13.3:7000        3	0c0d27f0ac395f5d - 10.68.13.16:7000        4	127ee4802991f308 - 10.68.13.13:7000        5	135ff2beab2a9809 - 10.68.14.5:7000        6	17bd6240eab65870 - 10.68.14.4:7000        7	1cf35757cbf47d7b - 10.68.13.10:7000        8	1df9580b8960a992 - 10.68.13.11:7000        9	29307d3fa5a04f78 - 10.68.14.12:7000        10	29dcb3474e31d4f3 - 10.68.14.15:7000        11	29e089c98dd2a144 - 10.68.14.16:7000        12	2a118b7e2738f479 - 10.68.13.4:7000        13	3d6aea26ba79d75f - 10.68.13.6:7000        14	42f9444ead801767 - 10.68.14.11:7000        15	562c6f38283d09fe - 10.68.14.2:7000        16	5dd5e540cca1556a - 10.68.14.6:7000        17	6c12a5d10f10e291 - 10.68.14.13:7000        18	6dae1d955ca72d96 - 10.68.13.7:7000        19	711db0f5fa40b412 - 10.68.14.14:7000        20	7c6b95212ee7c085 - 10.68.14.9:7000        21	7d010c31bf11df73 - 10.68.13.2:7000        22	82c43e908b1f3f01 - 10.68.13.12:7000        23	931d2de0aaf61cf5 - 10.68.13.8:7000        24	961d9d391e6021e7 - 10.68.13.14:7000        25	9a3ef6fa1081026c - 10.68.13.9:7000        26	b0b3d300fed8bc26 - 10.68.14.10:7000        27	b0f08fb98c8f5edc - 10.68.14.8:7000        28	b9cc316dc5aba880 - 10.68.13.5:7000        29	d9eda1ec29c2eeeb - 10.68.14.7:7000        30	e53cebb2617c86fd - 10.68.14.1:7000        31	ea46913c4999ccdf - 10.68.14.3:7000* Create a virtual machine image   1. Create a 256 GB virtual machine image of Alice.      $ qemu-img create sheepdog:Alice 256G   2. You can also convert from existing KVM images to Sheepdog ones.      $ qemu-img convert ~/amd64.raw sheepdog:Bob   3. See Sheepdog images by the following command.      $ collie vdi list        name        id    size    used  shared    creation time  object id      --------------------------------------------------------------------        Bob          0  2.0 GB  1.6 GB  0.0 MB 2010-03-23 16:16      80000        Alice        0  256 GB  0.0 MB  0.0 MB 2010-03-23 16:16      40000* Boot the virtual machine   1. Boot the virtual machine.      $ qemu-system-x86_64 -hda sheepdog:Alice   2. Following command checks used images.      $ collie vm list      Name            |Vdi size |Allocated| Shared  | Status      ----------------+---------+---------+---------+------------      Bob             |   2.0 GB|   1.6 GB|   0.0 MB| running on xx.xx.xx.xx      Alice           |   256 GB|   0.0 MB|   0.0 MB| not running* Snapshot   1. Snapshot      $ qemu-img snapshot -c name sheepdog:Alice      -c flag is meaningless currently   2. After getting snapshot, a new virtual machine images are added as a not-      current image.      $ collie vdi list        name        id    size    used  shared    creation time  object id      --------------------------------------------------------------------        Bob          0  2.0 GB  1.6 GB  0.0 MB 2010-03-23 16:16      80000        Alice        0  256 GB  0.0 MB  0.0 MB 2010-03-23 16:21      c0000      s Alice        1  256 GB  0.0 MB  0.0 MB 2010-03-23 16:16      40000   3. You can boot from the snapshot image by spcifing tag id      $ qemu-system-x86_64 -hda sheepdog:Alice:1* Cloning from the snapshot   1. Create a Charlie image as a clone of Alice's image.      $ qemu-img create -b sheepdog:Alice:1 sheepdog:Charlie   2. Charlie's image is added to the virtual machine list.      $ collie vdi list        name        id    size    used  shared    creation time  object id      --------------------------------------------------------------------        Bob          0  2.0 GB  1.6 GB  0.0 MB 2010-03-23 16:16      80000        Alice        0  256 GB  0.0 MB  0.0 MB 2010-03-23 16:21      c0000      s Alice        1  256 GB  0.0 MB  0.0 MB 2010-03-23 16:16      40000        Charlie      0  256 GB  0.0 MB  0.0 MB 2010-03-23 16:23     100000Test Environment----------------    - Debian squeeze amd64    - Debian lenny amd64===============================================================================Copyright (C) 2009-2011, Nippon Telegraph and Telephone Corporation.

 

Hi everyone,

Sheepdog is a distributed storage system for KVM/QEMU. It provides

highly available block level storage volumes to VMs like Amazon EBS.

Sheepdog supports advanced volume management features such as snapshot,

cloning, and thin provisioning. Sheepdog runs on several tens or hundreds

of nodes, and the architecture is fully symmetric; there is no central

node such as a meta-data server.

The following list describes the features of Sheepdog.

    * Linear scalability in performance and capacity

    * No single point of failure

    * Redundant architecture (data is written to multiple nodes)

    - Tolerance against network failure

    * Zero configuration (newly added machines will join the cluster automatically)

    - Autonomous load balancing

    * Snapshot

    - Online snapshot from qemu-monitor

    * Clone from a snapshot volume

    * Thin provisioning

    - Amazon EBS API support (to use from a Eucalyptus instance)

(* = current features, - = on our todo list)

More details and download links are here:

Note that the code is still in an early stage.

There are some critical TODO items:

    - VM image deletion support

    - Support architectures other than X86_64

    - Data recoverys

    - Free space management

    - Guarantee reliability and availability under heavy load

    - Performance improvement

    - Reclaim unused blocks

    - More documentation

We hope finding people interested in working together.

Enjoy!

Here are examples:

- create images

$ kvm-img create -f sheepdog "Alice's Disk" 256G

$ kvm-img create -f sheepdog "Bob's Disk" 256G

- list images

$ shepherd info -t vdi

   40000 : Alice's Disk  256 GB (allocated: 0 MB, shared: 0 MB), 2009-10-15

16:17:18, tag:        0, current

   80000 : Bob's Disk    256 GB (allocated: 0 MB, shared: 0 MB), 2009-10-15

16:29:20, tag:        0, current

- start up a virtual machine

$ kvm --drive format=sheepdog,file="Alice's Disk"

- create a snapshot

$ kvm-img snapshot -c name sheepdog:"Alice's Disk"

- clone from a snapshot

$ kvm-img create -b sheepdog:"Alice's Disk":0 -f sheepdog "Charlie's Disk"

Thanks.

--

MORITA, Kazutaka

NTT Cyber Space Labs

OSS Computing Project

Kernel Group

E-mail: morita.kazutaka@lab.ntt.co.jp