Hey Andrija,
So it sounds like your primary storage isn't enforcing an exclusive lock. How is your storage exposed to ACS? We've found that HA doesn't work at all with a host failure on KVM, as those VMs will never be restarted until the host is either recovered, or the host is removed from ACS. We are running a heavily patched 4.8. - Si ________________________________ From: Andrija Panic <andrija.pa...@gmail.com> Sent: Wednesday, February 14, 2018 3:22 AM To: dev Subject: Re: System VMs not migrating when host down Humble opinion (until HOST HA is ready in 4.11 if not mistaken?), avoid using HA option for VMs - avoid setting the "Offer HA" option on any compute/service offerings, since we did end up (was it ACS 4.5 or 4.8, can't remember now) having 2 copies of SAME VM running on 2 different hosts...imagine storage/volume corruption...this happened a few times for us. HOST HA looks like really a nice thing, I have not tested that yet...but sould completely solve the problem. On 14 February 2018 at 10:14, Paul Angus <paul.an...@shapeblue.com> wrote: > Hi Sean, > > The 'problem' with VM HA in KVM is that it relies on the parent host agent > to be connected to report that the VM is down. We cannot assume that just > because a host agent is disconnected, that the VMs on that host are not > running. > > This is where HOST HA comes in, this feature detects loss of connection to > the agent and then tries to determine if the VMs on that host are active > and then attempts some corrective action. > > > Kind regards, > > Paul Angus > > paul.an...@shapeblue.com > www.shapeblue.com<http://www.shapeblue.com> [http://www.shapeblue.com/wp-content/uploads/2017/06/logo.png]<http://www.shapeblue.com/> Shapeblue - The CloudStack Company<http://www.shapeblue.com/> www.shapeblue.com Rapid deployment framework for Apache CloudStack IaaS Clouds. CSForge is a framework developed by ShapeBlue to deliver the rapid deployment of a standardised ... > 53 Chandos Place, Covent Garden, London WC2N 4HSUK > @shapeblue > > > > > -----Original Message----- > From: Sean Lair [mailto:sl...@ippathways.com] > Sent: 13 February 2018 23:06 > To: dev@cloudstack.apache.org > Subject: System VMs not migrating when host down > > Hi all, > > We are testing VM HA and are having a problem with our system VMs > (secondary storage and console) not being started up on another host when a > host fails. > > Shouldn't the system VMs be VM HA-enabled? Currently they are just in an > "Alert" agent state, but never migrate. We are currently running 4.9.3. > > > Thanks > Sean > -- Andrija Panić
