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From Julien Garet <julien.ga...@inria.fr>
Subject Re: maximum hosts per cluster
Date Thu, 25 Oct 2012 13:03:20 GMT
> De: "JoonHyun Pac" <shibaboy@gmail.com>
> À: cloudstack-users@incubator.apache.org
> Envoyé: Jeudi 25 Octobre 2012 14:34:47
> Objet: Re: maximum hosts per cluster

> Cloudstack will not communicate with each hosts but pool master.
> That's why you should avoid many hosts in one pool.

> In our environment, 16 hosts in one pool cause serious load to master
> host
> and XAPI works done pretty slowly than 8 hosts pool.

Do you know if this limit also applies with KVM ? I understand that there could be a problem
with Xenserver and the master host in pools, but there should not be such a kind of limits
with kvm, every thing is operated from the cloud controller and there is no "cluster" seen
from KVM, no ? 

> Thanks,

> Joonhyun Pac

> On Thu, Oct 25, 2012 at 9:13 PM, Julien Garet <julien.garet@inria.fr>
> wrote:

> > > De: "JoonHyun Pac" <shibaboy@gmail.com>
> > > À: cloudstack-users@incubator.apache.org
> > > Envoyé: Jeudi 25 Octobre 2012 12:59:50
> > > Objet: Re: maximum hosts per cluster
> >
> > > The limit of hosts are 16 but it's too big for just one master
> > > host.
> > > I'm using 8 hosts per cluster and it works fine.
> > What happens if you have 16 hosts ? What's the difference from the
> > cloud
> > controller to have 16 hosts in one cluster or 16 hosts in two
> > clusters of 8.
> >
> > > On Thu, Oct 25, 2012 at 5:59 PM, Julien Garet
> > > <julien.garet@inria.fr>
> > > wrote:
> >
> > > > Hello,
> > > >
> > > >
> > > > Still in deployment planning, I am wondering how much hosts
> > > > should
> > > > I put
> > > > in a single cluster ? I am using Cloudstack 3.0.2 with KVM on
> > > > CentOS 6.2
> > > > hosts.
> > > >
> > > >
> > > > What are the advantages and drawbacks of putting hosts in the
> > > > same
> > > > cluster
> > > > ?
> > > >
> > > >
> > > > From what I see, if I am in the same cluster, I can migrate
> > > > instances
> > > > between hosts, what I can not do between different clusters, I
> > > > can
> > > > also
> > > > migrate primary storage.
> > > >
> > > >
> > > > What happens if I had more than 16 hosts in a KVM cluster (16
> > > > seems
> > > > to be
> > > > the limit from the advanced install guide).
> > > >
> > > >
> > > > I am using iSCSI luns as primary storage and Dell C6220 servers
> > > > (4
> > > > servers
> > > > in 2U chassis, sharing power input). I thought first I would
> > > > divide
> > > > each
> > > > chassis in its own cluster, but, from management side, I need
> > > > to
> > > > create a
> > > > new lun for every chassis. If I need to do some operations on a
> > > > chassis, I
> > > > need to put all servers in the cluster in maintenance mode, but
> > > > it
> > > > seems I
> > > > can't do that ! At least one server should be up, no ?
> > > >
> > > >
> > > > Any advice would be greatly appreciated
> > > >
> > > >
> > > > ------
> > > > Attention, changement d'adresse et de numéro de téléphone !
> > > > Julien GARET
> > > > DSI / SESI
> > > > Bureau B201
> > > > Inria Lille-Nord Europe
> > > > Bâtiment B, 6 rue Heloise
> > > > 59650 Villeneuve d'Ascq
> > > > téléphone: 03.59.35.86.86
> > > > portable: 06.79.88.10.47
> > > >
> >

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