On 12/08/2015 09:00 AM, Thomas Glanzmann wrote:
Hello Nab,
had you already a look at vvols? As I understand it there is LUN
presented to the host which is small in size. This LUN is used to piggy
back SCSI commands for Volumes which are not visiable by the host but
stored on the storage and grow on demand for thin provisioned virtual
disks or snapshots. I wonder what is necessary to support this in linux
target and if anyone is already working on it or maybe the
infrastructure already exists?
More informations:
http://www.yellow-bricks.com/2014/05/12/virtual-volumes-vendor-demos/
I also captured iSCSI traffic between an ESX server and a demo appliance
from VMware which is usind iscsid.
https://thomas.glanzmann.de/vvol_network.pcap
Hmm. Isn't this just a proprietary method of doing dynamic
provisioning from the host?
As such, one would need to write a VASA provider, mapping out the
capabilities on the host and figuring out how to provide those
capabilities/resources to the initiator.
Looks more like something which should be handled from within a
greater ecosystem; cloud infrastructure springs to mind here.
The alternative would be to hook into the T-10 conglomerate LUNs
effort; this aims to provide the same functionality but in an
official (ie standardized) way.
Cheers,
Hannes
--
Dr. Hannes Reinecke zSeries & Storage
hare@xxxxxxxx +49 911 74053 688
SUSE LINUX GmbH, Maxfeldstr. 5, 90409 Nürnberg
GF: F. Imendörffer, J. Smithard, J. Guild, D. Upmanyu, G. Norton
HRB 21284 (AG Nürnberg)
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