[Openstack] understanding ephemeral and persistant volumes
Michaël Van de Borne
michael.vandeborne at cetic.be
Tue Feb 28 08:51:40 UTC 2012
is it too complicated or too simple to be answered on the ML?
Le 23/02/12 16:46, Michaël Van de Borne a écrit :
> 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
>
>
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