> On Dec 12, 2014, at 7:19 AM, Itamar Heim <[email protected]> wrote: > > On 12/10/2014 05:47 PM, Jason Greene wrote: >> Thanks for the suggestions. >> >> Following Maor’s suggestion I was able to add a local domain, but that >> required maintenance mode, so I had to failure the engine over to another >> host to make the change to the current host. >> >> I like the appliance solution a little better, although I think it’s best if >> I were to run it under its own private KVM process unmanaged by ovirt, so >> that its possible to edit and cycle the host. Unfortunately it’s still a bit >> cumbersome as you need to have an engine appliance per system or shuffle >> around the image with some sort of disaster recovery plan. >> >> I also looked into using gluster or cephfs as a way to share state, but >> noticed the BZs about the lack of complete atomicity leading to duplicate >> engines. >> >> This is probably not the right place for dev musings, but IMO it would be >> great if in a future release there could be a solution that doesn’t require >> shared storage, which for smaller use-cases is often too pricey of a >> requirement. Ideally, under such a “horizontal” setup, each host could >> govern its own management data, and the engine could act more as an >> authoritative aggregator, thereby reducing the need for ha (if it fails just >> reinstall a clean one and let it reimport everything). It seems like most of >> the pieces are already there, with the per host-vdsm instance already >> containing much of the data. I’m guessing the missing element is having the >> engine support pulling that information as opposed to just pushing it. This >> is sort of like a capability that an unnamed proprietary competitor has, so >> it might have some sort of appeal. Of course such setups do have >> limitations, like you still need shared storage for live migrations and so >> on. So I certainly understand >> the rational behind the existing design. Anyway it’s just some food for >> thought. >> > before we go so far out... gluster should work with 3 hosts, we are working > on improving the flow for this for 3.6. today it requires quite a few manual > steps to do so. >
I was looked into that, but I got scared away by: https://bugzilla.redhat.com/show_bug.cgi?id=1097639 The option I was thinking of trying was drdb to mirror the ovirt appliance copied to a block store, and then using something like pacemaker to control failover. This would ensure that the engine always follows its data. -- Jason T. Greene WildFly Lead / JBoss EAP Platform Architect JBoss, a division of Red Hat _______________________________________________ Users mailing list [email protected] http://lists.ovirt.org/mailman/listinfo/users
