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Hi all,

I'd like to understand how things go with ephemeral and persistant volumes.
For instance, say that my gold images are stored in a Swift storage 
network, connected to Glance.

When I ask Nova to boot the VM,
- will the disk image stay in Swift storage?
- will the physical compute node copy the image from Swift to its local 
filesystem?
- will ephemeral volumes be stored on local compute node filesystem 
whereas persistant drives be stored in Swift?

According to these answers, I'll know if the compute nodes of my cloud 
should have disks attached or if no data will ever be stored on these 
nodes even when VMs are running.

maybe this is documented somewhere, but I didn't find clear information 
about ephemeral and persistant volume management?

thank you,

Michaël


-- 
Michaël Van de Borne
R&D Engineer, SOA team, CETIC
Phone: +32 (0)71 49 07 45 Mobile: +32 (0)472 69 57 16, Skype: mikemowgli
www.cetic.be, rue des Frères Wright, 29/3, B-6041 Charleroi