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:cwe...@iswest.net] > Sent: Thursday, May 31, 2012 9:21 AM > To: 'cloudstack-dev@incubator.apache.org'; 'cloudstack- > us...@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.hug...@ecommerce.com] > Sent: Thursday, May 31, 2012 8:16 AM > To: cloudstack-us...@incubator.apache.org; cloudstack- > d...@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
