Re: [ovirt-users] Advise needed: building cheap HA oVirt cluster with just 2 physical servers

[Artem Tambovskiy]

Hi,

Can anyone share their experience on deploying hosted-engine with GlusterFS
cluster?

I managed to setup a GlusterFS cluster and started to deploy hosted engine.
At first stage I was beaten by firewall rules - the deployment process
interrupted at GlusterFS config stage.
After fixing the rules I got engine up and running, but the host is
non-operational state still. Logged in to Web UI -> and see 2 action
points: "Gluster command failed on server" and Gluster status is
disconnected for this server"

This is a bit strange, since the cluster was properly detected during
deployment and deployment script was supposed to configure the cluster.

  --== STORAGE CONFIGURATION ==--

  Please specify the storage you would like to use (glusterfs,
iscsi, fc, nfs3, nfs4)[nfs3]: glusterfs
[ INFO  ] Please note that Replica 3 support is required for the shared
storage.
  Please specify the full shared storage connection path to use
(example: host:/path): .x.xx:/oVirt
[ INFO  ] GlusterFS replica 3 Volume detected
  Do you want to configure this host and its cluster for gluster?
(Yes, No) [No]: Yes
[ INFO  ] GlusterFS replica 3 Volume detected

Any ideas how to fix this?

Thanks in advance!
Regards,
Artem


On Fri, Nov 3, 2017 at 2:28 PM, Martin Sivak  wrote:

> Hi,
>
> cockpit is enabled by default when you use ovirt-node. You will
> probably have to install the necessary cockpit packages yourself on
> pure CentOS - you will need cockpit and ovirt + gdeploy cockpit
> plugins (sadly I do not recall the exact package names).
>
> With regards to arbiter and the wizard.. I really do not know, but I
> will alert my colleagues who might have more detailed knowledge of the
> gluster part.
>
> Denis, Sahina: can you please help me here?
>
> Best regards
>
> Martin Sivak
>
> On Fri, Nov 3, 2017 at 11:29 AM, Artem Tambovskiy
>  wrote:
> > Thanks for an article, Martin!
> > Any chance to configure a third cost to act as GlusterFS Arbitr only
> using
> > this wizard?
> >
> > And stupid question - how to make this wizard up and running? I've
> > everything installed and nothing is runnin on port 9090 :)
> >
> > Regards,
> > Artem
> >
> > On Fri, Nov 3, 2017 at 12:49 PM, Martin Sivak  wrote:
> >>
> >> Hi,
> >>
> >> you should take a look at the hyper converged way of installing oVirt.
> >> We have a cockpit wizard that does almost everything for you:
> >>
> >>
> >> https://www.ovirt.org/documentation/gluster-
> hyperconverged/chap-Deploying_Hyperconverged/
> >>
> >> It uses three hosts and collocates the VMs together with Gluster
> storage.
> >>
> >> Best regards
> >>
> >> --
> >> Martin Sivak
> >> SLA  /oVirt
> >>
> >> On Fri, Nov 3, 2017 at 8:39 AM, Artem Tambovskiy
> >>  wrote:
> >> > Thanks Eduardo!
> >> >
> >> > I think I can find a third server to build a glusterFS storage. So the
> >> > first
> >> > step will be to install a self-hosted engine on the new server and
> start
> >> > building a glusterFS storage. IS there any easy way to migrate
> existing
> >> > 5
> >> > VM's running on the second bare-metal oVirt host, right? I found a
> >> > little
> >> > bit tricky moving oVirt backups between the hosts (at least I failed
> to
> >> > replicate the existing VM's on the second server).
> >> >
> >> > Regards,
> >> > Artem
> >> >
> >> >
> >> >
> >> > On Fri, Nov 3, 2017 at 10:24 AM, Eduardo Mayoral 
> >> > wrote:
> >> >>
> >> >> For HA you will need some kind of storage available to all the
> compute
> >> >> nodes in the cluster. If you have no external storage and few nodes,
> I
> >> >> think
> >> >> your best option for storage is gluster , and the minimum number of
> >> >> nodes
> >> >> you will need for HA is 3 (the third gluster node can be
> metadata-only,
> >> >> but
> >> >> you still need that third node to give you quorum, avoid split-brains
> >> >> and
> >> >> have something that you can call "HA" with a straight face.
> >> >>
> >> >> Eduardo Mayoral Jimeno (emayo...@arsys.es)
> >> >> Administrador de sistemas. Departamento de Plataformas. Arsys
> internet.
> >> >> +34 941 620 145 ext. 5153
> >> >>
> >> >> On 03/11/17 08:10, Artem Tambovskiy wrote:
> >> >>
> >> >> Looking for a design advise on oVirt provisioning. I'm running a PoC
> >> >> lab
> >> >> on single bare-metal host (suddenly it was setup with just Local
> >> >> Storage
> >> >> domain) and
> >> >> no I'd like to rebuild the setup by making a cluster of 2 physical
> >> >> servers, no external storage array available. That are the options
> >> >> here? is
> >> >> there any options to build cheap HA cluster with just 2 servers?
> >> >>
> >> >> Thanks in advance!
> >> >>
> >> >> Artem
> >> >>
> >> >>
> >> >> ___
> >> >> Users mailing list
> >> >> Users@ovirt.org
> >> >> http://lists.ovirt.org/mailman/listinfo/users
> >> >>
> >> >>
> >> >
> >> >
> >> > 

Re: [ovirt-users] Advise needed: building cheap HA oVirt cluster with just 2 physical servers

[Martin Sivak]

Hi,

cockpit is enabled by default when you use ovirt-node. You will
probably have to install the necessary cockpit packages yourself on
pure CentOS - you will need cockpit and ovirt + gdeploy cockpit
plugins (sadly I do not recall the exact package names).

With regards to arbiter and the wizard.. I really do not know, but I
will alert my colleagues who might have more detailed knowledge of the
gluster part.

Denis, Sahina: can you please help me here?

Best regards

Martin Sivak

On Fri, Nov 3, 2017 at 11:29 AM, Artem Tambovskiy
 wrote:
> Thanks for an article, Martin!
> Any chance to configure a third cost to act as GlusterFS Arbitr only using
> this wizard?
>
> And stupid question - how to make this wizard up and running? I've
> everything installed and nothing is runnin on port 9090 :)
>
> Regards,
> Artem
>
> On Fri, Nov 3, 2017 at 12:49 PM, Martin Sivak  wrote:
>>
>> Hi,
>>
>> you should take a look at the hyper converged way of installing oVirt.
>> We have a cockpit wizard that does almost everything for you:
>>
>>
>> https://www.ovirt.org/documentation/gluster-hyperconverged/chap-Deploying_Hyperconverged/
>>
>> It uses three hosts and collocates the VMs together with Gluster storage.
>>
>> Best regards
>>
>> --
>> Martin Sivak
>> SLA  /oVirt
>>
>> On Fri, Nov 3, 2017 at 8:39 AM, Artem Tambovskiy
>>  wrote:
>> > Thanks Eduardo!
>> >
>> > I think I can find a third server to build a glusterFS storage. So the
>> > first
>> > step will be to install a self-hosted engine on the new server and start
>> > building a glusterFS storage. IS there any easy way to migrate existing
>> > 5
>> > VM's running on the second bare-metal oVirt host, right? I found a
>> > little
>> > bit tricky moving oVirt backups between the hosts (at least I failed to
>> > replicate the existing VM's on the second server).
>> >
>> > Regards,
>> > Artem
>> >
>> >
>> >
>> > On Fri, Nov 3, 2017 at 10:24 AM, Eduardo Mayoral 
>> > wrote:
>> >>
>> >> For HA you will need some kind of storage available to all the compute
>> >> nodes in the cluster. If you have no external storage and few nodes, I
>> >> think
>> >> your best option for storage is gluster , and the minimum number of
>> >> nodes
>> >> you will need for HA is 3 (the third gluster node can be metadata-only,
>> >> but
>> >> you still need that third node to give you quorum, avoid split-brains
>> >> and
>> >> have something that you can call "HA" with a straight face.
>> >>
>> >> Eduardo Mayoral Jimeno (emayo...@arsys.es)
>> >> Administrador de sistemas. Departamento de Plataformas. Arsys internet.
>> >> +34 941 620 145 ext. 5153
>> >>
>> >> On 03/11/17 08:10, Artem Tambovskiy wrote:
>> >>
>> >> Looking for a design advise on oVirt provisioning. I'm running a PoC
>> >> lab
>> >> on single bare-metal host (suddenly it was setup with just Local
>> >> Storage
>> >> domain) and
>> >> no I'd like to rebuild the setup by making a cluster of 2 physical
>> >> servers, no external storage array available. That are the options
>> >> here? is
>> >> there any options to build cheap HA cluster with just 2 servers?
>> >>
>> >> Thanks in advance!
>> >>
>> >> Artem
>> >>
>> >>
>> >> ___
>> >> Users mailing list
>> >> Users@ovirt.org
>> >> http://lists.ovirt.org/mailman/listinfo/users
>> >>
>> >>
>> >
>> >
>> > ___
>> > Users mailing list
>> > Users@ovirt.org
>> > http://lists.ovirt.org/mailman/listinfo/users
>> >
>
>
___
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Re: [ovirt-users] Advise needed: building cheap HA oVirt cluster with just 2 physical servers

[Artem Tambovskiy]

Thanks for an article, Martin!
Any chance to configure a third cost to act as GlusterFS Arbitr only using
this wizard?

And stupid question - how to make this wizard up and running? I've
everything installed and nothing is runnin on port 9090 :)

Regards,
Artem

On Fri, Nov 3, 2017 at 12:49 PM, Martin Sivak  wrote:

> Hi,
>
> you should take a look at the hyper converged way of installing oVirt.
> We have a cockpit wizard that does almost everything for you:
>
> https://www.ovirt.org/documentation/gluster-hyperconverged/chap-Deploying_
> Hyperconverged/
>
> It uses three hosts and collocates the VMs together with Gluster storage.
>
> Best regards
>
> --
> Martin Sivak
> SLA  /oVirt
>
> On Fri, Nov 3, 2017 at 8:39 AM, Artem Tambovskiy
>  wrote:
> > Thanks Eduardo!
> >
> > I think I can find a third server to build a glusterFS storage. So the
> first
> > step will be to install a self-hosted engine on the new server and start
> > building a glusterFS storage. IS there any easy way to migrate existing 5
> > VM's running on the second bare-metal oVirt host, right? I found a little
> > bit tricky moving oVirt backups between the hosts (at least I failed to
> > replicate the existing VM's on the second server).
> >
> > Regards,
> > Artem
> >
> >
> >
> > On Fri, Nov 3, 2017 at 10:24 AM, Eduardo Mayoral 
> wrote:
> >>
> >> For HA you will need some kind of storage available to all the compute
> >> nodes in the cluster. If you have no external storage and few nodes, I
> think
> >> your best option for storage is gluster , and the minimum number of
> nodes
> >> you will need for HA is 3 (the third gluster node can be metadata-only,
> but
> >> you still need that third node to give you quorum, avoid split-brains
> and
> >> have something that you can call "HA" with a straight face.
> >>
> >> Eduardo Mayoral Jimeno (emayo...@arsys.es)
> >> Administrador de sistemas. Departamento de Plataformas. Arsys internet.
> >> +34 941 620 145 ext. 5153
> >>
> >> On 03/11/17 08:10, Artem Tambovskiy wrote:
> >>
> >> Looking for a design advise on oVirt provisioning. I'm running a PoC lab
> >> on single bare-metal host (suddenly it was setup with just Local Storage
> >> domain) and
> >> no I'd like to rebuild the setup by making a cluster of 2 physical
> >> servers, no external storage array available. That are the options
> here? is
> >> there any options to build cheap HA cluster with just 2 servers?
> >>
> >> Thanks in advance!
> >>
> >> Artem
> >>
> >>
> >> ___
> >> Users mailing list
> >> Users@ovirt.org
> >> http://lists.ovirt.org/mailman/listinfo/users
> >>
> >>
> >
> >
> > ___
> > Users mailing list
> > Users@ovirt.org
> > http://lists.ovirt.org/mailman/listinfo/users
> >
>
___
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Re: [ovirt-users] Advise needed: building cheap HA oVirt cluster with just 2 physical servers

[Martin Sivak]

Hi,

you should take a look at the hyper converged way of installing oVirt.
We have a cockpit wizard that does almost everything for you:

https://www.ovirt.org/documentation/gluster-hyperconverged/chap-Deploying_Hyperconverged/

It uses three hosts and collocates the VMs together with Gluster storage.

Best regards

--
Martin Sivak
SLA  /oVirt

On Fri, Nov 3, 2017 at 8:39 AM, Artem Tambovskiy
 wrote:
> Thanks Eduardo!
>
> I think I can find a third server to build a glusterFS storage. So the first
> step will be to install a self-hosted engine on the new server and start
> building a glusterFS storage. IS there any easy way to migrate existing 5
> VM's running on the second bare-metal oVirt host, right? I found a little
> bit tricky moving oVirt backups between the hosts (at least I failed to
> replicate the existing VM's on the second server).
>
> Regards,
> Artem
>
>
>
> On Fri, Nov 3, 2017 at 10:24 AM, Eduardo Mayoral  wrote:
>>
>> For HA you will need some kind of storage available to all the compute
>> nodes in the cluster. If you have no external storage and few nodes, I think
>> your best option for storage is gluster , and the minimum number of nodes
>> you will need for HA is 3 (the third gluster node can be metadata-only, but
>> you still need that third node to give you quorum, avoid split-brains and
>> have something that you can call "HA" with a straight face.
>>
>> Eduardo Mayoral Jimeno (emayo...@arsys.es)
>> Administrador de sistemas. Departamento de Plataformas. Arsys internet.
>> +34 941 620 145 ext. 5153
>>
>> On 03/11/17 08:10, Artem Tambovskiy wrote:
>>
>> Looking for a design advise on oVirt provisioning. I'm running a PoC lab
>> on single bare-metal host (suddenly it was setup with just Local Storage
>> domain) and
>> no I'd like to rebuild the setup by making a cluster of 2 physical
>> servers, no external storage array available. That are the options here? is
>> there any options to build cheap HA cluster with just 2 servers?
>>
>> Thanks in advance!
>>
>> Artem
>>
>>
>> ___
>> Users mailing list
>> Users@ovirt.org
>> http://lists.ovirt.org/mailman/listinfo/users
>>
>>
>
>
> ___
> Users mailing list
> Users@ovirt.org
> http://lists.ovirt.org/mailman/listinfo/users
>
___
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Re: [ovirt-users] Advise needed: building cheap HA oVirt cluster with just 2 physical servers

[Kai Wagner]

Nevertheless you could end up with a split brain situation because
you've no quorum.

So it doesn't matter which kind of cluster you want to build, but you'll
need a third node as a tiebreaker.

I know that a 2 node cluster with drbd would work, but not in all cases,
so do yourself a favor and get a third node.


On 03.11.2017 09:15, Johan Bernhardsson wrote:
>
> On drbd you have one master and use iscsi to share the storage. If the
> master fails it will fail over to the other.
>
> You have one up that will act as the iscsi storage and jump between
> the hosts.
>
> If you run drbd master master ... Then you might get split brain and
> that is not fun :)
>
> On November 3, 2017 09:04:49 Eduardo Mayoral  wrote:
>
>> Just genuinely curious, how do you avoid split-brain situations with
>> a 2-node setup (be it drbd, gluster or anything else)?
>>
>> Eduardo Mayoral Jimeno (emayo...@arsys.es)
>> Administrador de sistemas. Departamento de Plataformas. Arsys internet.
>> +34 941 620 145 ext. 5153
>> On 03/11/17 08:40, Johan Bernhardsson wrote:
>>>
>>> Check on drbd. I have used that to build a cluster for two servers.
>>> It need some more work than a three node gluster conf but works well.
>>>
>>> I even think they have a white paper on how to do it for virtualization.
>>>
>>> /Johan
>>>
>>> On November 3, 2017 08:11:04 Artem Tambovskiy
>>>  wrote:
>>>
 Looking for a design advise on oVirt provisioning. I'm running a
 PoC lab on single bare-metal host (suddenly it was setup with just
 Local Storage domain) and 
 no I'd like to rebuild the setup by making a cluster of 2 physical
 servers, no external storage array available. That are the options
 here? is there any options to build cheap HA cluster with just 2
 servers? 

 Thanks in advance!

 Artem
 ___
 Users mailing list
 Users@ovirt.org 
 http://lists.ovirt.org/mailman/listinfo/users

>>>
>>>
>>> ___
>>> Users mailing list
>>> Users@ovirt.org
>>> http://lists.ovirt.org/mailman/listinfo/users
>>
>
>
> ___
> Users mailing list
> Users@ovirt.org
> http://lists.ovirt.org/mailman/listinfo/users

-- 
SUSE Linux GmbH, GF: Felix Imendörffer, Jane Smithard, Graham Norton, HRB 21284 
(AG Nürnberg)



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Re: [ovirt-users] Advise needed: building cheap HA oVirt cluster with just 2 physical servers

[Eduardo Mayoral]

Exporting the VMs to an export storage domain on the first server,
copying the files to another export storage domain on the second server
and importing it should work. What kind of problem did you find?

As for the order of doing things, my first oVirt lab was a 3-node setup
with gluster (oVirt version 4.0). I found this guide helpful:

https://www.ovirt.org/blog/2016/08/up-and-running-with-ovirt-4-0-and-gluster-storage/

I see there is a new version of it:

https://www.ovirt.org/blog/2017/04/up-and-running-with-ovirt-4.1-and-gluster-storage/

If I understand correctly you plan to re-use the server you already
have. I think you will probably find it much easier have to export your
VMs, re-deploy and import your VMs back. It means some downtime, but you
seem very constrained on the hardware available and there is not much
room to manouver...

Good luck!

Eduardo Mayoral Jimeno (emayo...@arsys.es)
Administrador de sistemas. Departamento de Plataformas. Arsys internet.
+34 941 620 145 ext. 5153

On 03/11/17 08:39, Artem Tambovskiy wrote:
> Thanks Eduardo!
>
> I think I can find a third server to build a glusterFS storage. So the
> first step will be to install a self-hosted engine on the new server
> and start building a glusterFS storage. IS there any easy way to
> migrate existing 5 VM's running on the second bare-metal oVirt host,
> right? I found a little bit tricky moving oVirt backups between the
> hosts (at least I failed to replicate the existing VM's on the second
> server).
>
> Regards,
> Artem
>
>
>
> On Fri, Nov 3, 2017 at 10:24 AM, Eduardo Mayoral  > wrote:
>
> For HA you will need some kind of storage available to all the
> compute nodes in the cluster. If you have no external storage and
> few nodes, I think your best option for storage is gluster , and
> the minimum number of nodes you will need for HA is 3 (the third
> gluster node can be metadata-only, but you still need that third
> node to give you quorum, avoid split-brains and have something
> that you can call "HA" with a straight face.
>
> Eduardo Mayoral Jimeno (emayo...@arsys.es )
> Administrador de sistemas. Departamento de Plataformas. Arsys internet.
> +34 941 620 145 ext. 5153 
>
> On 03/11/17 08:10, Artem Tambovskiy wrote:
>> Looking for a design advise on oVirt provisioning. I'm running a
>> PoC lab on single bare-metal host (suddenly it was setup with
>> just Local Storage domain) and 
>> no I'd like to rebuild the setup by making a cluster of 2
>> physical servers, no external storage array available. That are
>> the options here? is there any options to build cheap HA cluster
>> with just 2 servers? 
>>
>> Thanks in advance!
>>
>> Artem
>>
>>
>> ___
>> Users mailing list
>> Users@ovirt.org 
>> http://lists.ovirt.org/mailman/listinfo/users
>> 
>
>

___
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Re: [ovirt-users] Advise needed: building cheap HA oVirt cluster with just 2 physical servers

[Johan Bernhardsson]

On drbd you have one master and use iscsi to share the storage. If the 
master fails it will fail over to the other.


You have one up that will act as the iscsi storage and jump between the hosts.

If you run drbd master master ... Then you might get split brain and that 
is not fun :)



On November 3, 2017 09:04:49 Eduardo Mayoral  wrote:


Just genuinely curious, how do you avoid split-brain situations with a
2-node setup (be it drbd, gluster or anything else)?

Eduardo Mayoral Jimeno (emayo...@arsys.es)
Administrador de sistemas. Departamento de Plataformas. Arsys internet.
+34 941 620 145 ext. 5153

On 03/11/17 08:40, Johan Bernhardsson wrote:


Check on drbd. I have used that to build a cluster for two servers. It
need some more work than a three node gluster conf but works well.

I even think they have a white paper on how to do it for virtualization.

/Johan

On November 3, 2017 08:11:04 Artem Tambovskiy
 wrote:


Looking for a design advise on oVirt provisioning. I'm running a PoC
lab on single bare-metal host (suddenly it was setup with just Local
Storage domain) and 
no I'd like to rebuild the setup by making a cluster of 2 physical
servers, no external storage array available. That are the options
here? is there any options to build cheap HA cluster with just 2
servers? 

Thanks in advance!

Artem
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Re: [ovirt-users] Advise needed: building cheap HA oVirt cluster with just 2 physical servers

[Artem Tambovskiy]

Good point! Need to focus on this first

Thanks,
Artem

On Fri, Nov 3, 2017 at 10:50 AM, Karli Sjöberg  wrote:

> On fre, 2017-11-03 at 10:39 +0300, Artem Tambovskiy wrote:
> > Thanks Eduardo!
> >
> > I think I can find a third server to build a glusterFS storage. So
> > the first step will be to install a self-hosted engine on the new
> > server and start building a glusterFS storage.
>
> You´ll need to build the Gluster storage first, as you´ll want to
> install the Hosted Engine _in_ the HA Gluster storage, right?
>
> /K
>
> > IS there any easy way to migrate existing 5 VM's running on the
> > second bare-metal oVirt host, right? I found a little bit tricky
> > moving oVirt backups between the hosts (at least I failed to
> > replicate the existing VM's on the second server).
> >
> > Regards,
> > Artem
> >
> >
> >
> > On Fri, Nov 3, 2017 at 10:24 AM, Eduardo Mayoral 
> > wrote:
> > > For HA you will need some kind of storage available to all the
> > > compute nodes in the cluster. If you have no external storage and
> > > few nodes, I think your best option for storage is gluster , and
> > > the minimum number of nodes you will need for HA is 3 (the third
> > > gluster node can be metadata-only, but you still need that third
> > > node to give you quorum, avoid split-brains and have something that
> > > you can call "HA" with a straight face.
> > > Eduardo Mayoral Jimeno (emayo...@arsys.es)
> > > Administrador de sistemas. Departamento de Plataformas. Arsys
> > > internet.
> > > +34 941 620 145 ext. 5153
> > > On 03/11/17 08:10, Artem Tambovskiy wrote:
> > > > Looking for a design advise on oVirt provisioning. I'm running a
> > > > PoC lab on single bare-metal host (suddenly it was setup with
> > > > just Local Storage domain) and
> > > > no I'd like to rebuild the setup by making a cluster of 2
> > > > physical servers, no external storage array available. That are
> > > > the options here? is there any options to build cheap HA cluster
> > > > with just 2 servers?
> > > >
> > > > Thanks in advance!
> > > >
> > > > Artem
> > > >
> > > >
> > > > ___
> > > > Users mailing list
> > > > Users@ovirt.org
> > > > http://lists.ovirt.org/mailman/listinfo/users
> > >
> > ___
> > Users mailing list
> > Users@ovirt.org
> > http://lists.ovirt.org/mailman/listinfo/users
>
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Re: [ovirt-users] Advise needed: building cheap HA oVirt cluster with just 2 physical servers

[Eduardo Mayoral]

Just genuinely curious, how do you avoid split-brain situations with a
2-node setup (be it drbd, gluster or anything else)?

Eduardo Mayoral Jimeno (emayo...@arsys.es)
Administrador de sistemas. Departamento de Plataformas. Arsys internet.
+34 941 620 145 ext. 5153

On 03/11/17 08:40, Johan Bernhardsson wrote:
>
> Check on drbd. I have used that to build a cluster for two servers. It
> need some more work than a three node gluster conf but works well.
>
> I even think they have a white paper on how to do it for virtualization.
>
> /Johan
>
> On November 3, 2017 08:11:04 Artem Tambovskiy
>  wrote:
>
>> Looking for a design advise on oVirt provisioning. I'm running a PoC
>> lab on single bare-metal host (suddenly it was setup with just Local
>> Storage domain) and 
>> no I'd like to rebuild the setup by making a cluster of 2 physical
>> servers, no external storage array available. That are the options
>> here? is there any options to build cheap HA cluster with just 2
>> servers? 
>>
>> Thanks in advance!
>>
>> Artem
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Re: [ovirt-users] Advise needed: building cheap HA oVirt cluster with just 2 physical servers

[Karli Sjöberg]

On fre, 2017-11-03 at 10:39 +0300, Artem Tambovskiy wrote:
> Thanks Eduardo!
> 
> I think I can find a third server to build a glusterFS storage. So
> the first step will be to install a self-hosted engine on the new
> server and start building a glusterFS storage. 

You´ll need to build the Gluster storage first, as you´ll want to
install the Hosted Engine _in_ the HA Gluster storage, right?

/K

> IS there any easy way to migrate existing 5 VM's running on the
> second bare-metal oVirt host, right? I found a little bit tricky
> moving oVirt backups between the hosts (at least I failed to
> replicate the existing VM's on the second server).
> 
> Regards,
> Artem
> 
> 
> 
> On Fri, Nov 3, 2017 at 10:24 AM, Eduardo Mayoral 
> wrote:
> > For HA you will need some kind of storage available to all the
> > compute nodes in the cluster. If you have no external storage and
> > few nodes, I think your best option for storage is gluster , and
> > the minimum number of nodes you will need for HA is 3 (the third
> > gluster node can be metadata-only, but you still need that third
> > node to give you quorum, avoid split-brains and have something that
> > you can call "HA" with a straight face.
> > Eduardo Mayoral Jimeno (emayo...@arsys.es)
> > Administrador de sistemas. Departamento de Plataformas. Arsys
> > internet.
> > +34 941 620 145 ext. 5153
> > On 03/11/17 08:10, Artem Tambovskiy wrote:
> > > Looking for a design advise on oVirt provisioning. I'm running a
> > > PoC lab on single bare-metal host (suddenly it was setup with
> > > just Local Storage domain) and 
> > > no I'd like to rebuild the setup by making a cluster of 2
> > > physical servers, no external storage array available. That are
> > > the options here? is there any options to build cheap HA cluster
> > > with just 2 servers? 
> > > 
> > > Thanks in advance!
> > > 
> > > Artem
> > > 
> > > 
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> > > Users mailing list
> > > Users@ovirt.org
> > > http://lists.ovirt.org/mailman/listinfo/users
> >  
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Re: [ovirt-users] Advise needed: building cheap HA oVirt cluster with just 2 physical servers

[Johan Bernhardsson]

Check on drbd. I have used that to build a cluster for two servers. It need 
some more work than a three node gluster conf but works well.


I even think they have a white paper on how to do it for virtualization.

/Johan


On November 3, 2017 08:11:04 Artem Tambovskiy  
wrote:



Looking for a design advise on oVirt provisioning. I'm running a PoC lab on
single bare-metal host (suddenly it was setup with just Local Storage
domain) and
no I'd like to rebuild the setup by making a cluster of 2 physical servers,
no external storage array available. That are the options here? is there
any options to build cheap HA cluster with just 2 servers?

Thanks in advance!

Artem



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Re: [ovirt-users] Advise needed: building cheap HA oVirt cluster with just 2 physical servers

[Artem Tambovskiy]

Thanks Eduardo!

I think I can find a third server to build a glusterFS storage. So the
first step will be to install a self-hosted engine on the new server and
start building a glusterFS storage. IS there any easy way to migrate
existing 5 VM's running on the second bare-metal oVirt host, right? I found
a little bit tricky moving oVirt backups between the hosts (at least I
failed to replicate the existing VM's on the second server).

Regards,
Artem



On Fri, Nov 3, 2017 at 10:24 AM, Eduardo Mayoral  wrote:

> For HA you will need some kind of storage available to all the compute
> nodes in the cluster. If you have no external storage and few nodes, I
> think your best option for storage is gluster , and the minimum number of
> nodes you will need for HA is 3 (the third gluster node can be
> metadata-only, but you still need that third node to give you quorum, avoid
> split-brains and have something that you can call "HA" with a straight face.
>
> Eduardo Mayoral Jimeno (emayo...@arsys.es)
> Administrador de sistemas. Departamento de Plataformas. Arsys internet.+34 
> 941 620 145 ext. 5153 <+34%20941%2062%2001%2045>
>
> On 03/11/17 08:10, Artem Tambovskiy wrote:
>
> Looking for a design advise on oVirt provisioning. I'm running a PoC lab
> on single bare-metal host (suddenly it was setup with just Local Storage
> domain) and
> no I'd like to rebuild the setup by making a cluster of 2 physical
> servers, no external storage array available. That are the options here? is
> there any options to build cheap HA cluster with just 2 servers?
>
> Thanks in advance!
>
> Artem
>
>
> ___
> Users mailing listUsers@ovirt.orghttp://lists.ovirt.org/mailman/listinfo/users
>
>
>
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Re: [ovirt-users] Advise needed: building cheap HA oVirt cluster with just 2 physical servers

[Eduardo Mayoral]

For HA you will need some kind of storage available to all the compute
nodes in the cluster. If you have no external storage and few nodes, I
think your best option for storage is gluster , and the minimum number
of nodes you will need for HA is 3 (the third gluster node can be
metadata-only, but you still need that third node to give you quorum,
avoid split-brains and have something that you can call "HA" with a
straight face.

Eduardo Mayoral Jimeno (emayo...@arsys.es)
Administrador de sistemas. Departamento de Plataformas. Arsys internet.
+34 941 620 145 ext. 5153

On 03/11/17 08:10, Artem Tambovskiy wrote:
> Looking for a design advise on oVirt provisioning. I'm running a PoC
> lab on single bare-metal host (suddenly it was setup with just Local
> Storage domain) and 
> no I'd like to rebuild the setup by making a cluster of 2 physical
> servers, no external storage array available. That are the options
> here? is there any options to build cheap HA cluster with just 2 servers? 
>
> Thanks in advance!
>
> Artem
>
>
> ___
> Users mailing list
> Users@ovirt.org
> http://lists.ovirt.org/mailman/listinfo/users

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[ovirt-users] Advise needed: building cheap HA oVirt cluster with just 2 physical servers

[Artem Tambovskiy]

Looking for a design advise on oVirt provisioning. I'm running a PoC lab on
single bare-metal host (suddenly it was setup with just Local Storage
domain) and
no I'd like to rebuild the setup by making a cluster of 2 physical servers,
no external storage array available. That are the options here? is there
any options to build cheap HA cluster with just 2 servers?

Thanks in advance!

Artem
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