+me :-) Swift is much like Amazon S3(Simple Storage Service), and Nova-volume is much like Amazon EBS (Elastic Block Store). Swift is used as object store of VM images in OpenStack. but Nova-volume is used to store persistent data of VM instances which means even the instance was destroyed, the volume data will still be available for user. for example, it can be attached to another instance instead. Swift data model is a kind of Container/Object and providing unlimited number of objects, but Nova-volume is block device (much like a hard drive). The interesting thing is that Amazon ESB could provide snapshots of volumes which can be persisted to Amazon S3. So the same snopshot can spawn as many volumes as you want.
Best Regards,
Edward Zhang(张华) 地址:北京市海淀区东北旺西路8号 中关村
Staff Software Engineer 软件园28号楼 环宇大厦3层 邮编：100193
Travel&Transportation Standards Address: 3F Ring, Building 28
Emerging Technology Institute(ETI) Zhongguancun Software Park, 8
IBM China Software Development Lab Dongbeiwang West Road, Haidian
e-mail: zhu...@cn.ibm.com District, Beijing, P.R.C.100193
Notes ID: Hua ZZ Zhang/China/IBM
Tel: 86-10-82450483
Oleg Gelbukh
<ogelbukh@miranti
s.com> To
Sent by: Eric Luo <nextf...@gmail.com>
openstack-bounces cc
+zhuadl=cn.ibm.co openstack@lists.launchpad.net
m@lists.launchpad Subject
.net Re: [Openstack] [nova-volumes]
relationship between nova-volumes
and swift?
2012-04-28 15:47
Hello, Eric
Swift is actually an object store rather then volume store. It is used for
storing any types of objects as files in underlying file system. This files
can be anything, including binary images of block volumes. HTTP is used for
transporting objects to and from the store.
Nova-volume service is totally different. It allows to attach virtual block
devices to VMs by providing correct parameters for nova-compute's
'attach_volume' method. It has a number of drivers that can manage
different storage back-ends (Linux LVs, SAN virtual disks, distributed
storage systems), but all these back-ends must be able to provide a virtual
block device to VMs, which Swift is not capable of.
Primary integration point between Swift and nova-volume is a way to store
snapshots of virtual volumes to Swift store as files:
https://blueprints.launchpad.net/nova/+spec/store-snapshots-to-swift.
Status of work on this blueprint is unknown to me.
--
Best regards,
Oleg
On Sat, Apr 28, 2012 at 10:15 AM, Eric Luo <nextf...@gmail.com> wrote:
Hello ,all
I am a little confused about the nova-volumes service and the swift.I
know both are about the volume store,but
what's the relationship between them ?Can some one please explain it to
me please :)
Thanks!
Eric Luo
2012-04-28
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