[ovirt-users] Glusterfs HA with Ovirt

[Andrew Lau]

Or just localhost as your computer and storage are on the same box.


On Fri, Jul 4, 2014 at 2:48 PM, Punit Dambiwal <hypunit at gmail.com> wrote:
> 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
>> >> _______________________________________________
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>> >> Users at ovirt.org
>> >> http://lists.ovirt.org/mailman/listinfo/users
>> >>
>> >>
>> >
>> >
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>
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