There is another constraint that comes into play when cluster size becomes large, for example 32 hosts. We use standard vSwitch in default implementation, in order to support out-of-band vMotion (may be activated by DRS), when we deploy a VM, we actually will program all the vSwitches within the cluster, and this takes time, bigger the cluster, longer the time. So 16 hosts per cluster sounds a good balance even if the hard limit from vSphere is 32.
Kelven On 12/20/12 10:05 AM, "Will Chan" <will.c...@citrix.com> wrote: >Correct. In vsphere 5.1, this limitation was lifted to support up to 32 >hosts. > >> -----Original Message----- >> From: David Nalley [mailto:da...@gnsa.us] >> Sent: Thursday, December 20, 2012 8:55 AM >> To: cloudstack-dev@incubator.apache.org >> Subject: Re: [PROPOSAL] Raise cluster size limit to 16 on VMware >> >> On Thu, Dec 20, 2012 at 11:52 AM, Chip Childers >> <chip.child...@sungard.com> wrote: >> > Sorry, should have been more clear in my question. What's the math >> > that got you to 8? >> > >> >> No math involved. >> It was a VMFS limitation around number of hosts that could >>simultaneously >> use a linked clone disk image. >> >> --David
