cloudstack-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From chiu ching cheng <ccchiou...@gmail.com>
Subject Re: Cloudstack and KVM clusters,
Date Wed, 01 Apr 2015 01:31:42 GMT
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
>

Mime
  • Unnamed multipart/alternative (inline, None, 0 bytes)
View raw message