Nicolas, it makes a lot of sense what you want to do. ZFS+iSCSI is a perfect fit for vm storage, some other IaaS solutions already use this combination (and I have developed some). Keep in mind that Nexenta is only a distro based upon OpenSolaris: OpenIndiana, FreeBSD... there are a lot of options with ZFS.
There are several things you should consider to implement this feature: 1) The code that matters is mostly in nova/virt/libvirt/connection.py for libvirt 2) You need to implement a new storage type: iscsi ( http://libvirt.org/storage.html#StorageBackendISCSI) 3) You need to implement a feature to block-copy the source image to the backend iscsi storage 4) _cache_image method and most of _create_image should be developed thinking in 3) I think the only reason to implement this feature is to develop a highly scalable storage system for instances, so a single storage system does not make sense. It should be able to manage a list storage systems as a pool and load balance them. Some quick thoughts, good luck! Diego -- Diego Parrilla <http://www.stackops.com/>*CEO* *www.stackops.com | * diego.parri...@stackops.com** | +34 649 94 43 29 | skype:diegoparrilla* * <http://www.stackops.com/> * * On Sun, Jun 10, 2012 at 11:15 AM, Nicolas de BONFILS < openst...@nicolas2bonfils.com> wrote: > ** > > Hi Stackers, > > I got an idea/question about iscsi volume. > > Actually the workflow is : > > > 1. create an LVM pool > 2. create a volume in this pool (with nova command or horizon UI) > 3. share it with an iscsi target (the compute/volume node) > 4. attach it with an iscsi initiator (the VM) > > I use zfs for other project, and I'm very interested in using it > everywhere (when possible). One functionality zfs bring is zvol : it allows > to create a block device from a zfs pool (a zfs property allow to share > this device with iscsi). > With this, a new workflow will be : > > 1. create a zfs pool (zpool create <name> <device>) > 2. create a zvol block device (zfs create -V <size> > <poolname>/<volumename>) > 3. set the zfs property to share it with iscsi (zfs set shareiscsi=on > <poolname>/<volumename>) > 4. attach it with an iscsi initiator (the VM) > > From what I read, the Nexenta guys do a lot of work around zfs, but for > volume use I only found code to plug a Nexenta san (I do not have the > hardware to build a san), but no solution to use zfs drive/pool directly. > So my 2 questions are : > > 1. are some people interested in it ? > 2. does it seem possible to do it (maybe some one already try) ? Nova > volume driver > [github.com<https://github.com/openstack/nova/blob/master/nova/volume/driver.py>] > got subclasses for specific cases, maybe a new zfs one. > > > > Please discuss, submit ideas ! > > --- Nicolas > > _______________________________________________ > Mailing list: https://launchpad.net/~openstack > Post to : openstack@lists.launchpad.net > Unsubscribe : https://launchpad.net/~openstack > More help : https://help.launchpad.net/ListHelp > >
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