Don't forget SharedMountPoint. This (in theory, haven't tried it recently) allows you to use any clustered filesystem that has a consistent mountpoint across all KVM hosts in a CS cluster, e.g. mount an OCFS2 to /vmstore1 then register /vmstore1 as a SharedMountPoint.
The Ceph support is in the form of RBD, by the way. You could use CephFS if you wished via SharedMountPoint. On Tue, Mar 31, 2015 at 2:09 PM, Simon Weller <swel...@ena.com> wrote: > The hosts need to be part of the same Cloudstack cluster, and depending on > the underlying storage technology, you may need a clustered file system as > well. > > A Cloudstack cluster is basically a group of physical hosts. > > For example: > > You build a new Zone in Cloudstack. Under the zone you have a pod. Within the > pod, you build a new cluster (just a group of hosts). Then you assigned 4 > servers (hosts) into that cluster. You will be able to live migrate between > the 4 hosts assuming the original mentioned criteria are met. > > - Si > > ________________________________________ > From: Rafael Weingartner <rafaelweingart...@gmail.com> > Sent: Tuesday, March 31, 2015 4:02 PM > To: dev@cloudstack.apache.org > Cc: us...@cloudstack.apache.org > Subject: Re: Cloudstack and KVM clusters, > > Thanks Simon, > > > I think I got it. > > So, the hosts do not need to be in a cluster to perform the live migration. > > On Tue, Mar 31, 2015 at 5:59 PM, Simon Weller <swel...@ena.com> wrote: > >> Rafael, >> >> KVM live migration really relies on whether the underlying shared storage >> (and file system) supports the ability to provide data consistency during a >> migration. You never ever want a situation where 2 hosts are able to mount >> and write to the same volume concurrently. >> >> You can live migrate in KVM today using the following underlying file >> systems/methods: >> >> 1. NFS >> 2. CEPH >> 3. Clustered Logical Volume Management (CLVM) on top of SAN exposed >> storage via iSCSI,FC or FCOE. >> >> It's also possible to build your own storage driver and set a LUN to read >> only on a particular host using your SANs API. >> >> Solidfire, Nexenta and Cloudbyte have also added storage drivers more >> recently that may provide support for live migration, but as I'm not >> personally familiar with these storage platforms, I'll leave it up to >> others to comment if they wish. >> >> - Si >> >> >> >> >> >> ________________________________________ >> From: Rafael Weingartner <rafaelweingart...@gmail.com> >> Sent: Tuesday, March 31, 2015 3:36 PM >> To: us...@cloudstack.apache.org; dev@cloudstack.apache.org >> Subject: Cloudstack and KVM clusters, >> >> Hi folks, >> >> I was looking a matrix of Cloudstack compatibility matrix at >> http://pt.slideshare.net/TimMackey/hypervisor-31754727, >> >> Slide 25 seemed to show that we cannot have clusters of KVM in CS? Is that >> true? Is it possible to live migrate VMs between KVM hosts that are not >> clustered in CS? >> >> >> -- >> Rafael Weingärtner >> > > > > -- > Rafael Weingärtner
