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From Chiradeep Vittal <>
Subject Re: Externally Managed Clusters - pointer to more info?
Date Thu, 19 Jul 2012 22:12:48 GMT
Not sure what you mean by "separation". In an XS cluster, the thing that
is shared is the pool master and the shared storage. This allows for VMs
to live/cold migrate from host to host. CloudStack still picks the host in
the cluster to start the VM. The ip addresses are not locked to any
cluster, neither is the memory. That is, a free guest ip can be assigned
to a VM in any cluster.

If you put each host in a distinct cluster, then you lose the ability to
recover from failed hosts or to put hosts in maintenance mode and yet
recover the vms that were running on those hosts.

On 7/19/12 2:51 PM, "Evan Miller" <> wrote:

>Hi Chiradeep:
>So, it sounds like there isn't a way in the same cluster for two
>XenServer hosts to not pool CPU, memory, and ip addresses?
>To get that kind of cpu, memory and ip address management separation,
>it sounds like each host should be in a different cluster. Right?
>-----Original Message-----
>From: Chiradeep Vittal []
>Sent: Thursday, July 19, 2012 2:20 PM
>To: CloudStack Users
>Subject: Re: Externally Managed Clusters - pointer to more info?
>AFAIK, this is available only for VMWare clusters currently. The main
>difference is that vCenter takes care of HA and you can live migrate
>using vCenter and CloudStack will cope with the out-of-band change.
>On 7/19/12 12:31 PM, "Evan Miller" <> wrote:
>>Running CloudStack Management Server:
>>  v3.0.2.1
>>  [root@cumulus management]# uname -a
>>  Linux 2.6.32-220.el6.x86_64 #1 SMP Tue Dec 6
>>19:48:22 GMT 2011 x86_64 x86_64 x86_64 GNU/Linux
>>  [root@cumulus management]#
>>Hypervisor :
>>  XenServer v6.02
>>Where can I find info on externally managed clusters?
>>I looked here and didn't find any details:
>>Rather than tear down my cloud-managed setup and experiment with the
>>attribute, I'd rather read about how this feature is different than
>>For example,
>>is there no pooling at all of multiple hosts in the same cluster when
>>the clustertype is defined as externally managed?
>>Evan Miller
>>Citrix Systems. Inc.
>>Desktop and Cloud Engineering Infrastructure
>>4988 Great America Parkway
>>Santa Clara, CA 95054

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