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From Andrei Mikhailovsky <and...@arhont.com>
Subject Re: Cloudstack and KVM clusters,
Date Wed, 01 Apr 2015 07:32:08 GMT
I would highly recommend looking at the Ceph storage instead of using too many tiers of complications.
Ceph integrates well with kvm and cloudstack and has proven to work very well over the years.


Andrei 
----- Original Message -----

> From: "chiu ching cheng" <ccchiou049@gmail.com>
> To: users@cloudstack.apache.org
> Cc: dev@cloudstack.apache.org
> Sent: Wednesday, 1 April, 2015 2:31:42 AM
> Subject: Re: Cloudstack and KVM clusters,

> If I wnat to build a kvm native cluster with gfs2 + DLM , and use
> iscsi +
> DRBD in storage .

> Then add the kvm cluster to cloudstack , and add the SharedMountPoint
> to
> cloudstack as primary storage , Does it work ?

> On Wed, Apr 1, 2015 at 6:12 AM, Marcus <shadowsor@gmail.com> wrote:

> > 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 <sweller@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 <rafaelweingartner@gmail.com>
> > > Sent: Tuesday, March 31, 2015 4:02 PM
> > > To: dev@cloudstack.apache.org
> > > Cc: users@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 <sweller@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 <rafaelweingartner@gmail.com>
> > >> Sent: Tuesday, March 31, 2015 3:36 PM
> > >> To: users@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
> >

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