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From Lucas Hughes <lucas.hug...@ecommerce.com>
Subject Re: 8 Xen hosts limitations
Date Thu, 31 May 2012 20:04:35 GMT
On 05/31/2012 01:46 PM, Anthony Xu wrote:
> Hi Clayton,
>
> You are right, 8 host is a rule of thumb, 16 is hard limitation.
> Cloudstack uses XAPI to communicate with XenServer Pool, CloudStack uses XAPI much more
heavily than user uses XAPI though XenCenter/CLI,
> Which includes some regular XAPI call, like VM state Sync,
>
> We found if there are more than 8 host in a pool, it may cause XenServer host slow.
>
> It is a rule of thumb, which assumes you want to run more than ~200 VM on this XenServer
pool.
>
> If you want to run big VM, the number of VMs in the XenServer pool is less than 100,
I think you can add more host into a pool.
>
>
> Thanks,
> Anthony
>
>
>
>
>
>
>> -----Original Message-----
>> From: Clayton Weise [mailto:cweise@iswest.net]
>> Sent: Thursday, May 31, 2012 9:21 AM
>> To: 'cloudstack-dev@incubator.apache.org'; 'cloudstack-
>> users@incubator.apache.org'
>> Subject: RE: 8 Xen hosts limitations
>>
>> Somebody from Citrix/CloudStack can correct me here but as I understand
>> it 8 is a rule of thumb and not a strict law.  That being said,
>> XenServer (and XCP) are limited to 16 hosts per resource pool -- and
>> that _is_ a hard limit.  Other limits are available from here:
>> http://www.citrix.com/site/resources/dynamic/salesdocs/Citrix_XenServer
>> _6_Configuration_Limits.pdf
>>
>> -Clayton
>>
>> -----Original Message-----
>> From: Lucas Hughes [mailto:lucas.hughes@ecommerce.com]
>> Sent: Thursday, May 31, 2012 8:16 AM
>> To: cloudstack-users@incubator.apache.org; cloudstack-
>> dev@incubator.apache.org
>> Subject: 8 Xen hosts limitations
>>
>> Hello,
>>
>> I see in the install docs that it says not to use more than 8 Xen hosts
>> in one pool. I am wondering why this is the case because as a test I
>> added 10 hosts to a pool and Cloudstack is managing them without any
>> issues that I see. Any further clarification on this issue would be
>> greatly appreciated.
>>
>> --
>> Lucas Hughes
>> Cloud Engineer
>> Ecommerce Inc
Thanks to all for the clarification.

-- 
Lucas Hughes
Cloud Engineer
Ecommerce Inc


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