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Hi Vivek,

Per our discussion about the migration of an in-use volume, I have done 
the following tests:

I took KVM as the hypervisor and LVM as the backend for cinder.
Configure two c-vol nodes.
Create the image in glance.
Create a volume from this image.
Boot a VM from this volume, so the volume becomes in-use and the VM is 
ready.
Migrate this in-use volume.

The result turns out fine finally and the volume is successfully migrated 
via the swap_volume method in Nova. I just send you this mail as a 
confirmation that swap_volume works for your use case.

Best wishes,
Vincent Hou (侯胜博)

Staff Software Engineer, Open Standards and Open Source Team, Emerging 
Technology Institute, IBM China Software Development Lab

Tel: 86-10-82450778 Fax: 86-10-82453660
Notes ID: Sheng Bo Hou/China/IBM at IBMCN    E-mail: sbhou at cn.ibm.com 
Address:3F Ring, Building 28 Zhongguancun Software Park, 8 Dongbeiwang 
West Road, Haidian District, Beijing, P.R.C.100193
地址:北京市海淀区东北旺西路8号中关村软件园28号楼环宇大厦3层 邮编：100193
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