Excerpts from Heiko Krämer's message of 2013-07-05 09:24:03 -0700:
Heyho guys,
I'm searching for a solution to share storage over more then one instance.
Normally you attach a block device with cinder directly via iscsi or
glusterfs or whatever to one instance and that's it. Multi attachments
are not present.
Use case:
I've an application on 4 application instances and a database instance.
Now you have static file like images, movies, css ... but this files
should be available on each application instance.
This use case is best served by object storage like swift and CEPH's radosgw.
Now you need to fire up an "storage" instance and attach a volume. After
that you can with nfs or what ever share your stuff to the application
instances but i think this is a very big ressource overhead for small
projects. You need a instance only to share your data on each project
and this n times :(
If you only have one small app with 5 instances, running your own
OpenStack is quite overkill. However, I suspect you have OpenStack so
you can have many small apps with a few instances, and thus you'll find
many of them can benefit from a good solid object store.
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