Hi,
I am planning to take the QA job for this feature. Have reviewed the functional
spec(not much details are present), went through community discussion and have
the following questions.
1-Do we support mixed (heterogeneous) cluster for vmware in CS?
it seems VMWare support mixed cluster, please correct me if I am wrong
a-" http://communities.vmware.com/message/2008030";
b-"
http://blogs.vmware.com/vsphere/2011/10/mixing-esxesxi-versions-in-an-hadrs-cluster.html";
2-Are We going to change Global config VMware cluster size limit to 16?
3- Apart from configuration and hypervisor_capabilities table are there any
other table going to be modified ?
4-In hypervisor _capabilities table what is dummy value we are going to put for
other hypervisor type , is it -1 ?
5-Any API changes ?
6-Upgrade path ?
7-option of adding host through backdoor(adding host separately to cluster,
even cluster size > 8 host) is still available ?
Thanks
Prashant Kumar Mishra
-----Original Message-----
From: Koushik Das [mailto:[email protected]]
Sent: Thursday, January 10, 2013 1:56 PM
To: [email protected]
Subject: RE: [PROPOSAL] Raise cluster size limit to 16 on VMware
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:[email protected]]
> Sent: Thursday, January 10, 2013 12:43 PM
> To: [email protected]
> 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:[email protected]]
> Sent: Wednesday, January 9, 2013 10:30 PM
> To: [email protected]
> 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:[email protected]]
> > Sent: Tuesday, January 08, 2013 11:45 PM
> > To: [email protected]
> > Subject: RE: [PROPOSAL] Raise cluster size limit to 16 on VMware
> >
> > See inline
> >
> > -Koushik
> >
> > > -----Original Message-----
> > > From: Alex Huang [mailto:[email protected]]
> > > Sent: Tuesday, January 08, 2013 11:24 PM
> > > To: [email protected]
> > > 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:[email protected]]
> > > > Sent: Tuesday, January 08, 2013 9:44 AM
> > > > To: [email protected]
> > > > 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:[email protected]]
> > > > Sent: Monday, January 7, 2013 4:57 AM
> > > > To: [email protected]
> > > > 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:[email protected]]
> > > > > Sent: Thursday, January 03, 2013 5:26 PM
> > > > > To: [email protected]
> > > > > 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:[email protected]]
> > > > > > Sent: Thursday, December 20, 2012 10:08 PM
> > > > > > To: [email protected]
> > > > > > 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:[email protected]]
> > > > > > > Sent: Thursday, December 20, 2012 8:10 AM
> > > > > > > To: [email protected]
> > > > > > > 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:[email protected]]
> > > > > > > Sent: 20 December 2012 15:25
> > > > > > > To: [email protected]
> > > > > > > Subject: Re: [PROPOSAL] Raise cluster size limit to 16 on
> > > > > > > VMware
> > > > > > >
> > > > > > > On Thu, Dec 20, 2012 at 1:54 AM, Koushik Das
> > > > > > > <[email protected]>
> > > > > > > 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
> > > > > > >
