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From Nux! <...@li.nux.ro>
Subject Re: Cloudstack and KVM clusters,
Date Wed, 01 Apr 2015 07:28:47 GMT
Yes, Chiu.

--
Sent from the Delta quadrant using Borg technology!

Nux!
www.nux.ro

----- Original Message -----
> From: "chiu ching cheng" <ccchiou049@gmail.com>
> To: users@cloudstack.apache.org
> Cc: dev@cloudstack.apache.org
> Sent: Wednesday, 1 April, 2015 02:31:42
> 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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