Cinder

how to instruct hypervisor to use SAN storage to create a volume specified in a flavor

Asked by Sandhya

When the passed in flavor contains a disk requirement also, who will take care of creating and attaching of that disk. Cinder, Nova or Hypervisor?

If Cinder, does it visible in cinder list command?
If Nova, does it initiate and iScsi session?
If Hypervisor, does it have the storage driver to create and attach the disk to VM?

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Shanthakumar K (shantha-kumar) said : 		#1

openstack flavors contains only ephemeral disk (non-persistent storage and OS partitioned disk)

where cinder as its external storage, its can be linked with flavors.

I believe its taking from nova, where nova talks to internal storage and takes the disk space for OS image.

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Sandhya (skolachi) said : 		#2

Ok. If nova takes care of ephemeral disk creating/attaching etc, how can we configure nova to use SAN instead of local storage?
If we can configure nova with SAN, can the SAN details be different from cinder.conf?

And can we say that the ephemeral disk used to store root file system of the VM OS?

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Shanthakumar K (shantha-kumar) said : 		#3

Do don't want to specify anything in nova.conf !!!!!

If u want to use the SAN for your Openstack environment, use the multiback driver and do the respective changes in the cinder.conf

http://docs.openstack.org/trunk/openstack-block-storage/admin/content/multi_backend.html

>>And can we say that the ephemeral disk used to store root file system of the VM OS?
Yes, its for root FS.. You can ensure by creating the instance with different flavor types.

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