Open Stack

The NetApp driver uses NetApp specific API calls to implement the actual
cloning of the file.  You could probably generalize it by implementing the
keeping of a cached image file on the destination share for future copies,
and then implement a standard "copy file" method that could be overloaded
by individual drivers.  In implementing the cache image though you would
also need to implement a cache "scrubber" that will come around and clean
up the cached files once you reach (user) defined thresholds.

Andrew Kerr
OpenStack QA
Cloud Solutions Group
NetApp


From:  "Luohao   (brian)" <brian.luohao at huawei.com>
Reply-To:  "OpenStack Development Mailing List (not for usage questions)"
<openstack-dev at lists.openstack.org>
Date:  Monday, April 14, 2014 at 2:17 AM
To:  "OpenStack Development Mailing List (not for usage questions)"
<openstack-dev at lists.openstack.org>
Subject:  Re: [openstack-dev] Efficient image cloning implementation in
NetApp nfs drivers // make this part of base NFS driver


Nice idea.
 
Actually, fast image cloning has been widely supported by most NAS
devices, and VMware VAAI also started to require this criteria many years
ago.
 
However, I am not quite sure what exactly need to put into the base NFS
driver, anyways, the fast cloning api will vary for specific vendors.
 
-Hao

 
From: Nilesh P Bhosale [mailto:nilesh.bhosale at in.ibm.com]

Sent: Monday, April 14, 2014 1:51 PM
To: OpenStack Development Mailing List (not for usage questions)
Subject: [openstack-dev] Efficient image cloning implementation in NetApp
nfs drivers // make this part of base NFS driver

 
Hi All,

I was going through the following blue print, NetApp proposed and
implemented in its driver (NetAppNFSDriver -
cinder/volume/drivers/netapp/nfs.py) a while back (change
<https://review.openstack.org/#/c/41868/>):
https://blueprints.launchpad.net/cinder/+spec/netapp-cinder-nfs-image-cloni
ng

It looks quite an interesting and valuable feature for the end customers.
Can we make it part of the base NfsDriver (cinder/volume/drivers/nfs.py)?
so that the customers using the base NFS driver can benefit and also other
drivers inheriting from
 this base NFS driver (e.g. IBMNAS_NFSDriver, NexentaNfsDriver) can also
benefit.

Please let me know your valuable opinion.
I can start a blueprint for the Juno release.

Thanks,
Nilesh