doc:Adding documentation for glusterfs and ovirt integration

Change-Id: Ie3b42a74198150c7e353d360ad38ac127d1a5ca2 
BUG: 1086782
> Signed-off-by: Kasturi Narra <knarra@redhat.com>
> Signed-off-by: Humble Chirammal <hchiramm@redhat.com>
> Reviewed-on: http://review.gluster.org/7772
> Reviewed-by: Sahina Bose <sabose@redhat.com>
> Reviewed-by: Humble Devassy Chirammal <humble.devassy@gmail.com>
> Reviewed-by: Shubhendu Tripathi <shtripat@redhat.com>
> Reviewed-by: Niels de Vos <ndevos@redhat.com>
> Tested-by: Niels de Vos <ndevos@redhat.com>
Signed-off-by: Humble Chirammal <hchiramm@redhat.com>
Change-Id: Ie3b42a74198150c7e353d360ad38ac127d1a5ca2
Reviewed-on: http://review.gluster.org/7891
Reviewed-by: Niels de Vos <ndevos@redhat.com>
Tested-by: Niels de Vos <ndevos@redhat.com>

1 files changed, 106 insertions, 0 deletions

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+##Ovirt Integration with glusterfs
+
+oVirt is an opensource virtualization management platform. You can use oVirt to manage
+hardware nodes, storage and network resources, and to deploy and monitor virtual machines
+running in your data center.  oVirt serves as the bedrock for Red Hat''s Enterprise Virtualization product,
+and is the "upstream" project where new features are developed in advance of their inclusion
+in that supported product offering.
+
+To know more about ovirt please visit http://www.ovirt.org/ and to configure
+#http://www.ovirt.org/Quick_Start_Guide#Install_oVirt_Engine_.28Fedora.29%60
+
+For the installation step of ovirt, please refer
+#http://www.ovirt.org/Quick_Start_Guide#Install_oVirt_Engine_.28Fedora.29%60
+
+When oVirt integrated with gluster, glusterfs can be used in below forms:
+
+* As a storage domain to host VM disks.
+
+There are mainly two ways to exploit glusterfs as a storage domain.
+	- POSIXFS_DOMAIN ( >=oVirt 3.1 )
+	- GLUSTERFS_DOMAIN ( >=oVirt 3.3)
+
+The former one has performance overhead and is not an ideal way to consume images hosted in glusterfs volumes.
+When used by this method, qemu uses glusterfs `mount point` to access VM images and invite FUSE overhead.
+The libvirt treats this as a file type disk in its xml schema.
+
+The latter is the recommended way of using glusterfs with ovirt as a storage domain. This provides better
+and efficient way to access images hosted under glusterfs volumes.When qemu accessing glusterfs volume using this method,
+it make use of `libgfapi` implementation of glusterfs and this method is called native integration.
+Here the glusterfs is added as a block backend to qemu and libvirt treat this as a `network` type disk.
+
+For more details on this, please refer # http://www.ovirt.org/Features/GlusterFS_Storage_Domain
+However there are 2 bugs which block usage of this feature.
+
+https://bugzilla.redhat.com/show_bug.cgi?id=1022961
+https://bugzilla.redhat.com/show_bug.cgi?id=1017289
+
+Please check above bugs for latest status.
+
+* To manage gluster trusted pools.
+
+oVirt web admin console can be used to -
+	- add new / import existing gluster cluster
+	- add/delete volumes
+	- add/delete bricks
+	- set/reset volume options
+	- optimize volume for virt store
+	- Rebalance and Remove bricks
+	- Monitor gluster deployment - node, brick, volume status,
+	  Enhanced service monitoring (Physical node resources as well Quota, geo-rep and self-heal status) through Nagios integration(>=oVirt 3.4)
+
+
+
+When configuing ovirt to manage only gluster cluster/trusted pool, you need to select `gluster` as an input for
+`Application mode` in OVIRT ENGINE CONFIGURATION option of `engine-setup` command.
+Refer # http://www.ovirt.org/Quick_Start_Guide#Install_oVirt_Engine_.28Fedora.29%60
+
+If you want to use gluster as both ( as a storage domain to host VM disks and to manage gluster trusted pools)
+you need to input `both` as a value for `Application mode` in engine-setup command.
+
+Once you have successfully installed oVirt Engine as mentioned above, you will be provided with instructions
+to access oVirt''s web console.
+
+Below example shows how to configure gluster nodes in fedora.
+
+
+#Configuring gluster nodes.
+
+On the machine designated as your host, install any supported distribution( ex:Fedora/CentOS/RHEL...etc).
+A minimal installation is sufficient.
+
+Refer # http://www.ovirt.org/Quick_Start_Guide#Install_Hosts
+
+
+##Connect to Ovirt Engine
+
+Log In to Administration Console
+
+Ensure that you have the administrator password configured during installation of  oVirt engine.
+
+- To connect to oVirt webadmin console
+
+
+Open a browser and navigate to https://domain.example.com/webadmin. Substitute domain.example.com with the URL provided during installation
+
+If this is your first time connecting to the administration console, oVirt Engine will issue
+security certificates for your browser. Click the link labelled this certificate to trust the
+ca.cer certificate. A pop-up displays, click Open to launch the Certificate dialog.
+Click `Install Certificate` and select to place the certificate in Trusted Root Certification Authorities store.
+
+
+The console login screen displays. Enter admin as your User Name, and enter the Password that
+you provided during installation. Ensure that your domain is set to Internal. Click Login.
+
+
+You have now successfully logged in to the oVirt web administration console. Here, you can configure and manage all your gluster resources.
+
+To manage gluster trusted pool:
+
+- Create a cluster with "Enable gluster service" - turned on. (Turn on "Enable virt service" if the same nodes are used as hypervisor as well)
+- Add hosts which have already been set up as in step Configuring gluster nodes.
+- Create a volume, and click on "Optimize for virt store",This sets the volume tunables optimize volume to be used as an image store
+
+To use this volume as a storage domain:
+
+Please refer `User interface` section of www.ovirt.org/Features/GlusterFS_Storage_Domain