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Daniel,
Thanks for you response. But I am still confusing about use a iscsi device,
if I want to use it as shared storage, first I need to attach to a node as
a block storage, then I mount it to other compute nodes using NFS. The
problem is that this will make a big lost on performance. Currently nova
already support to create a new VM on ceph RBD, but why we can not create
it on a block storage?

Thanks.

ÔÚ 2013Äê10ÔÂ28ÈÕÐÇÆÚÒ»£¬Speichert,Daniel дµÀ£º

>  Ray,****
>
> It seems that OpenStack purposefully omits the method of provisioning
> shared storage.****
>
> It¡¯s totally up to you ¨C all you need to do is to mount
> /var/lib/nova/instances/ on each compute node on the system level.****
>
> ** **
>
> Make sure your user IDs inside /var/lib/nova/instances/ are correct: nova,
> libvirt-em and kvm need to have matching IDs across all machines if you use
> e.g. NFSv3.****
>
> ** **
>
> Regards,****
>
> Daniel****
>
> ** **
>
> *From:* Ray Sun [mailto:xiaoquqi at gmail.com <javascript:_e({}, 'cvml',
> 'xiaoquqi at gmail.com');>]
> *Sent:* Monday, October 28, 2013 4:27 AM
> *To:* OpenStack Maillist
> *Subject:* [Openstack] [Nova]How to setup shared storage for live
> migration based on IPSAN device?****
>
> ** **
>
> Hi Stackers,****
>
> I found there is a document to describe how to setup live migration using
> NFS by Mirantis.****
>
>
> http://www.mirantis.com/blog/tutorial-openstack-live-migration-with-kvm-hypervisor-and-nfs-shared-storage
> ****
>
> In this articles, there is a paragraph here:****
>
> *In a typical Openstack deployment, every compute node manages its
> instances locally in a dedicated directory (for example,
> /var/lib/nova/instances/) but for live migration, this folder has to be in
> a centralized location and shared across all the compute nodes. Hence, a
> shared file system or block storage is an important requirement for
> enabling live migration. For shared storage, a distributed file system such
> as GlusterFS, NFS needs to be properly configured and running before live
> migration can be performed. SAN storage protocols such as Fibre Channel
> (FC) and iSCSI can also be used for shared storage.*****
>
> ** **
>
> Please pay attention the sentence in blue, currently, I have a IPSAN
> device, and I want use it as the shared storage for all my compute nodes.
> My questions is how to setup it in nova, I didn't find any document to
> introduce this, please help. Thanks a lot.****
>
> ** **
>
> Best Regards
> -- Ray****
>


-- 
Best Regards
-- Ray
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