[ovirt-users] Glusterfs HA with Ovirt

[Punit Dambiwal]

Hi Andrew,

Thanks for the update....that means HA can not work without VIP in the
gluster,so better to use the glusterfs with the VIP to take over the
ip...in case of any storage node failure...


On Fri, Jul 4, 2014 at 12:35 PM, Andrew Lau <andrew at andrewklau.com> wrote:

> Don't forget to take into consideration quroum, that's something
> people often forget
>
> The reason you're having the current happen, is gluster only uses the
> initial IP address to get the volume details. After that it'll connect
> directly to ONE of the servers, so with your 2 storage server case,
> 50% chance it won't go to paused state.
>
> For the VIP, you could consider CTDB or keepelived, or even just using
> localhost (as your storage and compute are all on the same machine).
> For CTDB, checkout
> http://community.redhat.com/blog/2014/05/ovirt-3-4-glusterized/
>
> I have a BZ open regarding gluster VMs going into paused state and not
> being resumable, so it's something you should also consider. My case,
> switch dies, gluster volume goes away, VMs go into paused state but
> can't be resumed. If you lose one server out of a cluster is a
> different story though.
> https://bugzilla.redhat.com/show_bug.cgi?id=1058300
>
> HTH
>
> On Fri, Jul 4, 2014 at 11:48 AM, Punit Dambiwal <hypunit at gmail.com> wrote:
> > Hi,
> >
> > Thanks...can you suggest me any good how to/article for the glusterfs
> with
> > ovirt...
> >
> > One strange thing is if i will try both (compute & storage) on the same
> > node...the below quote not happen....
> >
> > ---------------------
> >
> > Right now, if 10.10.10.2 goes away, all your gluster mounts go away and
> your
> > VMs get paused because the hypervisors can’t access the storage. Your
> > gluster storage is still fine, but ovirt can’t talk to it because
> 10.10.10.2
> > isn’t there.
> > ---------------------
> >
> > Even the 10.10.10.2 goes down...i can still access the gluster mounts
> and no
> > VM pause....i can access the VM via ssh...no connection failure.....the
> > connection drop only in case of SPM goes down and the another node will
> > elect as SPM(All the running VM's pause in this condition).
> >
> >
> >
> > On Fri, Jul 4, 2014 at 4:12 AM, Darrell Budic <darrell.budic at zenfire.com
> >
> > wrote:
> >>
> >> You need to setup a virtual IP to use as the mount point, most people
> use
> >> keepalived to provide a virtual ip via vrrp for this. Setup something
> like
> >> 10.10.10.10 and use that for your mounts.
> >>
> >> Right now, if 10.10.10.2 goes away, all your gluster mounts go away and
> >> your VMs get paused because the hypervisors can’t access the storage.
> Your
> >> gluster storage is still fine, but ovirt can’t talk to it because
> 10.10.10.2
> >> isn’t there.
> >>
> >> If the SPM goes down, it the other hypervisor hosts will elect a new one
> >> (under control of the ovirt engine).
> >>
> >> Same scenarios if storage & compute are on the same server, you still
> need
> >> a vip address for the storage portion to serve as the mount point so
> it’s
> >> not dependent on any one server.
> >>
> >> -Darrell
> >>
> >> On Jul 3, 2014, at 1:14 AM, Punit Dambiwal <hypunit at gmail.com> wrote:
> >>
> >> Hi,
> >>
> >> I have some HA related concern about glusterfs with Ovirt...let say i
> have
> >> 4 storage node with gluster bricks as below :-
> >>
> >> 1. 10.10.10.1 to 10.10.10.4 with 2 bricks each and i have distributed
> >> replicated architecture...
> >> 2. Now attached this gluster storge to ovrit-engine with the following
> >> mount point 10.10.10.2/vol1
> >> 3. In my cluster i have 3 hypervisior hosts (10.10.10.5 to 10.10.10.7)
> SPM
> >> is on 10.10.10.5...
> >> 4. What happen if 10.10.10.2 will goes down.....can hypervisior host can
> >> still access the storage ??
> >> 5. What happen if SPM goes down ???
> >>
> >> Note :- What happen for point 4 &5 ,If storage and Compute both working
> on
> >> the same server.
> >>
> >> Thanks,
> >> Punit
> >> _______________________________________________
> >> Users mailing list
> >> Users at ovirt.org
> >> http://lists.ovirt.org/mailman/listinfo/users
> >>
> >>
> >
> >
> > _______________________________________________
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> >
>
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