There can be multiple dimensions based on which the size can vary but it cannot go beyond the max. value (32).
I am referring to the following docs: http://www.vmware.com/pdf/vsphere4/r40/vsp_40_config_max.pdf http://www.vmware.com/pdf/vsphere5/r50/vsphere-50-configuration-maximums.pdf http://www.vmware.com/pdf/vsphere5/r51/vsphere-51-configuration-maximums.pdf -Koushik > -----Original Message----- > From: Hari Kannan [mailto:hari.kan...@citrix.com] > Sent: Thursday, January 10, 2013 12:43 PM > To: cloudstack-dev@incubator.apache.org > Subject: RE: [PROPOSAL] Raise cluster size limit to 16 on VMware > > Hi Koushik, > > I have a question/concern - > > The "limitations" are multi-dimensional - for example, vSphere 5.0 clusters > hosting linked clone pools are limited to 8 ESXi hosts when using VMFS > datastores and 32 ESXi hosts when using only NFS datastores. In 5.1, they > made both 32 hosts. I think 4.0 had a different set of values. > > In other words, the host limits are hypervisor type, hypervisor version, > storage technology etc. i.e. we cant set the hard limit as 32 as 5.0 did not > support it for VMFS.. > > Hari > > -----Original Message----- > From: Koushik Das [mailto:koushik....@citrix.com] > Sent: Wednesday, January 9, 2013 10:30 PM > To: cloudstack-dev@incubator.apache.org > Subject: RE: [PROPOSAL] Raise cluster size limit to 16 on VMware > > To clarify some more. > > What I have suggested is to have a max. hosts per cluster limit based on > specific HV version. For e.g. for Vmware > > Version 4.0 will have a max. limit of X (i.e. in any CS Vmware 4.0 cluster, > the > max. number of hosts that can be added is X) Version 4.1 will have a max. > limit of Y Version 5.0 will have a max. limit of Z > > Based on the vmware specification X, Y, Z are all 32. As part of best > practices > (in documentation) all the limitations discussed as to why the limit was set > to > 8 earlier can be mentioned. The idea is that CS shouldn't impose any > artificial > restrictions and rely only on HV specifications to the extent possible. > > For any new supported version another entry can be added to the > hypervisor_capabilities table. > > As Alex mentioned, the admin is free to decide on the number of hosts that > needs to be added in a cluster as long as the hard max. limits are not > exceeded. > > -Koushik > > > -----Original Message----- > > From: Koushik Das [mailto:koushik....@citrix.com] > > Sent: Tuesday, January 08, 2013 11:45 PM > > To: cloudstack-dev@incubator.apache.org > > Subject: RE: [PROPOSAL] Raise cluster size limit to 16 on VMware > > > > See inline > > > > -Koushik > > > > > -----Original Message----- > > > From: Alex Huang [mailto:alex.hu...@citrix.com] > > > Sent: Tuesday, January 08, 2013 11:24 PM > > > To: cloudstack-dev@incubator.apache.org > > > Subject: RE: [PROPOSAL] Raise cluster size limit to 16 on VMware > > > > > > Koushik, > > > > > > I believe what you pointed out there is the maximum limit for the > > hypervisor. > > > > Yes. Maximum based on the HV version. > > > > > > > > Hari, > > > > > > What's the point of the admin setting these values? Afterall, he's > > > the one who's adding hosts himself? If he wants more, why should cs > > > stop > > him? > > > > > > --Alex > > > > > > > -----Original Message----- > > > > From: Hari Kannan [mailto:hari.kan...@citrix.com] > > > > Sent: Tuesday, January 08, 2013 9:44 AM > > > > To: cloudstack-dev@incubator.apache.org > > > > Subject: RE: [PROPOSAL] Raise cluster size limit to 16 on VMware > > > > > > > > Hi Koushik, > > > > > > > > Can you please elaborate > > > > > > > > a) how the admin gets to set this value? > > > > Why should the admin be allowed to change these values? These are the > > max. limit supported by the specific HV based on the version. > > > > > > b) is this value set on a per cluster basis? If so, what is the default > value? > > > > It's not per cluster. > > > > > > > > > > Hari > > > > > > > > -----Original Message----- > > > > From: Koushik Das [mailto:koushik....@citrix.com] > > > > Sent: Monday, January 7, 2013 4:57 AM > > > > To: cloudstack-dev@incubator.apache.org > > > > Subject: RE: [PROPOSAL] Raise cluster size limit to 16 on VMware > > > > > > > > Didn't see any feedback, so am assuming that the approach seems > > > > reasonable. I will go ahead and start with the implementation. Not > > > > planning to write a FS as this is a small feature and the below > > > > mail > > > summarizes it. > > > > > > > > -Koushik > > > > > > > > > -----Original Message----- > > > > > From: Koushik Das [mailto:koushik....@citrix.com] > > > > > Sent: Thursday, January 03, 2013 5:26 PM > > > > > To: cloudstack-dev@incubator.apache.org > > > > > Subject: RE: [PROPOSAL] Raise cluster size limit to 16 on VMware > > > > > > > > > > So based on the discussions would it be fair to conclude that > > > > > this should be handled by adding some column like > 'max_host_per_cluster' > > > > > in hypervisor_capabilities table. Currently the following > > > > > version entries are present for Vmware. For each version an > > > > > appropriate value can be associated based on the limitations/actual > supported. > > > > > For other HVs where this setting is not applicable some dummy > > > > > value, say (-1) can be > > > > entered. > > > > > > > > > > hv_type hv_version > > > > > VMware default > > > > > VMware 4.0 > > > > > VMware 4.1 > > > > > VMware 5.0 > > > > > > > > > > Let me know if there is a consensus on this. > > > > > > > > > > Thanks, > > > > > Koushik > > > > > > > > > > > -----Original Message----- > > > > > > From: Alex Huang [mailto:alex.hu...@citrix.com] > > > > > > Sent: Thursday, December 20, 2012 10:08 PM > > > > > > To: cloudstack-dev@incubator.apache.org > > > > > > Subject: RE: [PROPOSAL] Raise cluster size limit to 16 on > > > > > > VMware > > > > > > > > > > > > +1 > > > > > > > > > > > > The more we move these types of things out of configuration > > > > > > and into component specific references the better. > > > > > > > > > > > > --Alex > > > > > > > > > > > > > -----Original Message----- > > > > > > > From: Tamas Monos [mailto:tam...@veber.co.uk] > > > > > > > Sent: Thursday, December 20, 2012 8:10 AM > > > > > > > To: cloudstack-dev@incubator.apache.org > > > > > > > Subject: RE: [PROPOSAL] Raise cluster size limit to 16 on > > > > > > > VMware > > > > > > > > > > > > > > Hi, > > > > > > > > > > > > > > I'd recommend removing any hard limits from CS and introduce > > > > > > > a variable like "max.guest.limit" on the Hypervisor Capabilities > page. > > > > > > > This value could default to 8, but should the admin decide > > > > > > > otherwise could be set to anything. > > > > > > > > > > > > > > Regards > > > > > > > > > > > > > > Tamas Monos DDI > > > > > > > +44(0)2034687012 > > > > > > > Chief Technical > > > > > > > Office +44(0)2034687000 > > > > > > > Veber: The Hosting Specialists Fax > > > > > > > +44(0)871 522 7057 > > > > > > > http://www.veber.co.uk > > > > > > > > > > > > > > Follow us on Twitter: www.twitter.com/veberhost Follow us on > > > > > Facebook: > > > > > > > www.facebook.com/veberhost > > > > > > > > > > > > > > -----Original Message----- > > > > > > > From: David Nalley [mailto:da...@gnsa.us] > > > > > > > Sent: 20 December 2012 15:25 > > > > > > > To: cloudstack-dev@incubator.apache.org > > > > > > > Subject: Re: [PROPOSAL] Raise cluster size limit to 16 on > > > > > > > VMware > > > > > > > > > > > > > > On Thu, Dec 20, 2012 at 1:54 AM, Koushik Das > > > > > > > <koushik....@citrix.com> > > > > > > > wrote: > > > > > > > > This http://www.vmware.com/pdf/vsphere5/r51/vsphere-51- > > > > > > > configuration-maximums.pdf mentions that the max. can be 32 > > > > > > > for ESX > > > > > 5.1. > > > > > > > Any specific reason to make it 16? Also it needs to be seen > > > > > > > that this limit works across all supported ESX versions. > > > > > > > > > > > > > > > > -Koushik > > > > > > > > > > > > > > > > > > > > > > Yes - the different versions having different limits > > > > > > > complicates things a > > > > > bit. > > > > > > > 5.1 = 32, 5.0 = 16 4.x = 8? > > > > > > > > > > > > > > --David > > > > > > >
