For VMware, CloudStack uses native HA provided by VMware. VMware provides HA at the level of cluster.
Regards, Sateesh > -----Original Message----- > From: Nitin Mehta [mailto:nitin.me...@citrix.com] > Sent: 28 February 2013 10:13 > To: cloudstack-dev@incubator.apache.org > Cc: Hari Kannan > Subject: Re: HA question > > CS has its own HA logic and doesn't use the native HA of the HV and so the > question for enabling the HA for hosts doesn't arise. This is true for XS. > For Vmware and KVM, I will let the guru's speak :) > > On 28/02/13 9:55 AM, "kdam...@apache.org" <kdam...@apache.org> wrote: > > >Thanks that¹s awesome, but not quite the answer I was looking for. > > > >To better phrase my question, if the cluster is the basic unit of > >availability, when hosts are enabled for HA, must all hosts in the > >cluster be enabled? Or can the cluster exist with a non-uniform > >structure, having only some hosts enabled for HA? > > > >You partially answered it with the special reserve HA hosts, but I'm > >looking more in terms of general use. > > > >Thanks > > > >-kelcey > > > > > >>-----Original Message----- > >>From: Hari Kannan [mailto:hari.kan...@citrix.com] > >>Sent: Wednesday, February 27, 2013 8:21 PM > >>To: cloudstack-dev@incubator.apache.org > >>Subject: RE: HA question > >> > >>Hi Kelsey, > >> > >>HA is at 2 levels VMs can be marked HA. In addition, you can mark some > >>hosts as reserved for ³Dedicated² HA hosts. Quoting from the manual, the > >>dedicated HA option is set through a special host tag when the host is > >>created. > >>To allow the administrator to dedicate hosts to only HA-enabled VMs, set > >>the > >>global configuration variable ha.tag to the desired tag (for example, > >>"ha_host"), and restart the Management Server. Enter the value in the > >>Host > >>Tags field when adding the host(s) that you want to dedicate to > >>HA-enabled > >>VMs. > >> > >>Hari > >> > >>From: Kelcey Damage (BT) [mailto:kel...@backbonetechnology.com] > >>Sent: Wednesday, February 27, 2013 8:00 PM > >>To: CloudStack dev list > >>Subject: RE: HA question > >> > >>Hi, > >> > >>I can¹t remember, do we enable HA on a per host basis, or on a per > >>cluster > >>basis? > >> > >>Thanks. > >> > >>[cid:image001.png@01CE1524.FA0D61B0]Kelcey Damage Infrastructure > >>Systems Architect > >>www.backbonetechnology.com<http://www.backbonetechnology.com/> > >>------------------------------------------------------------------------- > >>kel...@backbonetechnology.com<mailto:kel...@backbonetechnology.com > >>> > >> > >>address: 55 East 7th Ave, Vancouver, BC, V5T 1M4 > >>tel: +1 604 713 8560 ext:114 > >>fax: +1 604 605 0964 > >>skype: kelcey.damage > >> > > > >
