[ovirt-users] Re: Two Hosts with Self Hosted Engine - HA / Failover & NFS

2019-03-07 Thread Greg Sheremeta 
On Thu, Mar 7, 2019 at 10:39 AM Gianluca Cecchi 
wrote:

> On Thu, Mar 7, 2019 at 4:31 PM Greg Sheremeta  wrote:
>
>> Yes, you can do this with only 2 hosts and NFS.
>>
>> https://ovirt.org/documentation/vmm-guide/chap-Administrative_Tasks.html#improving-uptime-with-virtual-machine-high-availability
>>
>> With the 2 hosts in the same cluster, they will both see the storage
>> domain automatically.
>>
>> [He's not asking about gluster -- he's asking about NFS. gluster, split
>> brain, arbiters, etc are not relevant.]
>>
>> Greg
>>
>>
> Hi Greg,
> actually the OP wrote:
>
> 1)  Both hosts are identical with RAID Drive Arrays of 8TB.
> 2) how the Storage setup is done so that NFS will replicate across the
> hosts?
>
> These considerations let think that he/she has not an external NFS server,
> but would like to provide the local storage (syncronyzed between hosts in
> some way) offered via NFS.
> Hence the suggestions in following answers about Gluster based solutions.
> If there i an external NFS server your link perfectly applies
>
> Gianluca
>
>
>
Ah. Fair enough.

Greg


-- 

GREG SHEREMETA

SENIOR SOFTWARE ENGINEER - TEAM LEAD - RHV UX

Red Hat NA



gsher...@redhat.comIRC: gshereme

___
Users mailing list -- users@ovirt.org
To unsubscribe send an email to users-le...@ovirt.org
Privacy Statement: https://www.ovirt.org/site/privacy-policy/
oVirt Code of Conduct: 
https://www.ovirt.org/community/about/community-guidelines/
List Archives: 
https://lists.ovirt.org/archives/list/users@ovirt.org/message/KVH54SAVKVWBSNSUGVFTP7XQKHF7QRGB/

[ovirt-users] Re: Two Hosts with Self Hosted Engine - HA / Failover & NFS

2019-03-07 Thread Gianluca Cecchi 
On Thu, Mar 7, 2019 at 4:31 PM Greg Sheremeta  wrote:

> Yes, you can do this with only 2 hosts and NFS.
>
> https://ovirt.org/documentation/vmm-guide/chap-Administrative_Tasks.html#improving-uptime-with-virtual-machine-high-availability
>
> With the 2 hosts in the same cluster, they will both see the storage
> domain automatically.
>
> [He's not asking about gluster -- he's asking about NFS. gluster, split
> brain, arbiters, etc are not relevant.]
>
> Greg
>
>
Hi Greg,
actually the OP wrote:

1)  Both hosts are identical with RAID Drive Arrays of 8TB.
2) how the Storage setup is done so that NFS will replicate across the
hosts?

These considerations let think that he/she has not an external NFS server,
but would like to provide the local storage (syncronyzed between hosts in
some way) offered via NFS.
Hence the suggestions in following answers about Gluster based solutions.
If there i an external NFS server your link perfectly applies

Gianluca
___
Users mailing list -- users@ovirt.org
To unsubscribe send an email to users-le...@ovirt.org
Privacy Statement: https://www.ovirt.org/site/privacy-policy/
oVirt Code of Conduct: 
https://www.ovirt.org/community/about/community-guidelines/
List Archives: 
https://lists.ovirt.org/archives/list/users@ovirt.org/message/JDGLLMN7CA62QXR2LTT4EQUENXVAOLHW/

[ovirt-users] Re: Two Hosts with Self Hosted Engine - HA / Failover & NFS

2019-03-07 Thread Greg Sheremeta 
Yes, you can do this with only 2 hosts and NFS.
https://ovirt.org/documentation/vmm-guide/chap-Administrative_Tasks.html#improving-uptime-with-virtual-machine-high-availability

With the 2 hosts in the same cluster, they will both see the storage domain
automatically.

[He's not asking about gluster -- he's asking about NFS. gluster, split
brain, arbiters, etc are not relevant.]

Greg

On Wed, Mar 6, 2019 at 11:58 PM Strahil  wrote:

> I don't think that you can achieve it with only 2 nodes, as you can't
> protect yourself of split brain.
> Ovirt supports only glusterfs of replica 3 arbiter 1. If you create your
> own glusterfs , you can use glusterd2 with a "remote arbiter" in another
> location. That will give you protection from split brain and as it is
> remote - the latency won't kill your write speed.
>
> I can recommend you to get a VM in your environment (not hosted on any of
> the 2 hosts) or a small machine with a SSD  and use that as pure arbiter.
>
> Using one of the 2 nodes as arbiter brick is not going to help, as when
> that node fails - the cluster on the other node will stop working.
> It's the same with hosting NFS on one of the machines.
>
> As far as I know DRBD is not yet fully integrated, but you can give it a
> try.Still, using only 2 nodes gives no protection from split brain.
>
> Best Regards,
> Strahil NikolovOn Mar 7, 2019 01:28, sha...@lifestylepanel.com wrote:
> >
> > Is it possible to have only two physical hosts with NFS and be able to
> do VM HA / Failover between these hosts?
> >
> > Both hosts are identical with RAID Drive Arrays of 8TB.
> >
> > If so, can anybody point me to any docs or examples on exactly how the
> Storage setup is done so that NFS will replicate across the hosts?
> >
> > If not what file system should I use to achieve this?
> >
> > Thanks
> > Shane
> > ___
> > Users mailing list -- users@ovirt.org
> > To unsubscribe send an email to users-le...@ovirt.org
> > Privacy Statement: https://www.ovirt.org/site/privacy-policy/
> > oVirt Code of Conduct:
> https://www.ovirt.org/community/about/community-guidelines/
> > List Archives:
> https://lists.ovirt.org/archives/list/users@ovirt.org/message/5H4NDGUBBFYWI65KFNVJVVQO3O5HNPN2/
> ___
> Users mailing list -- users@ovirt.org
> To unsubscribe send an email to users-le...@ovirt.org
> Privacy Statement: https://www.ovirt.org/site/privacy-policy/
> oVirt Code of Conduct:
> https://www.ovirt.org/community/about/community-guidelines/
> List Archives:
> https://lists.ovirt.org/archives/list/users@ovirt.org/message/DZ7ZL7QLZQHUCPUTNJ3OYSOXHUM7YZKM/
>


-- 

GREG SHEREMETA

SENIOR SOFTWARE ENGINEER - TEAM LEAD - RHV UX

Red Hat NA



gsher...@redhat.comIRC: gshereme

___
Users mailing list -- users@ovirt.org
To unsubscribe send an email to users-le...@ovirt.org
Privacy Statement: https://www.ovirt.org/site/privacy-policy/
oVirt Code of Conduct: 
https://www.ovirt.org/community/about/community-guidelines/
List Archives: 
https://lists.ovirt.org/archives/list/users@ovirt.org/message/TJ3PZL7CVYGRZFKZALSFQILCOVAKLVXR/

[ovirt-users] Re: Two Hosts with Self Hosted Engine - HA / Failover & NFS

2019-03-06 Thread Strahil 
I don't think that you can achieve it with only 2 nodes, as you can't protect 
yourself of split brain.
Ovirt supports only glusterfs of replica 3 arbiter 1. If you create your own 
glusterfs , you can use glusterd2 with a "remote arbiter" in another location. 
That will give you protection from split brain and as it is remote - the 
latency won't kill your write speed.

I can recommend you to get a VM in your environment (not hosted on any of the 2 
hosts) or a small machine with a SSD  and use that as pure arbiter.

Using one of the 2 nodes as arbiter brick is not going to help, as when that 
node fails - the cluster on the other node will stop working.
It's the same with hosting NFS on one of the machines.

As far as I know DRBD is not yet fully integrated, but you can give it a 
try.Still, using only 2 nodes gives no protection from split brain.

Best Regards,
Strahil NikolovOn Mar 7, 2019 01:28, sha...@lifestylepanel.com wrote:
>
> Is it possible to have only two physical hosts with NFS and be able to do VM 
> HA / Failover between these hosts? 
>
> Both hosts are identical with RAID Drive Arrays of 8TB. 
>
> If so, can anybody point me to any docs or examples on exactly how the 
> Storage setup is done so that NFS will replicate across the hosts? 
>
> If not what file system should I use to achieve this? 
>
> Thanks 
> Shane
> ___
> Users mailing list -- users@ovirt.org
> To unsubscribe send an email to users-le...@ovirt.org
> Privacy Statement: https://www.ovirt.org/site/privacy-policy/
> oVirt Code of Conduct: 
> https://www.ovirt.org/community/about/community-guidelines/
> List Archives: 
> https://lists.ovirt.org/archives/list/users@ovirt.org/message/5H4NDGUBBFYWI65KFNVJVVQO3O5HNPN2/
___
Users mailing list -- users@ovirt.org
To unsubscribe send an email to users-le...@ovirt.org
Privacy Statement: https://www.ovirt.org/site/privacy-policy/
oVirt Code of Conduct: 
https://www.ovirt.org/community/about/community-guidelines/
List Archives: 
https://lists.ovirt.org/archives/list/users@ovirt.org/message/DZ7ZL7QLZQHUCPUTNJ3OYSOXHUM7YZKM/

[ovirt-users] Re: Two Hosts with Self Hosted Engine - HA / Failover & NFS

2019-03-06 Thread Jayme 
Shane,

This may be possible, I'm sure others will chime in.  I do think you'd save
yourself a lot of headaches if you were able to do three server
Hyper-converged infrastructure setup with GlusterFS in either replica 3 or
replica 3 arbiter 1.  You will get a very good HA solution out of a 3 node
HCI build.   It's difficult to avoid split brain with only two nodes.

On Wed, Mar 6, 2019 at 7:29 PM  wrote:

> Is it possible to have only two physical hosts with NFS and be able to do
> VM HA / Failover between these hosts?
>
> Both hosts are identical with RAID Drive Arrays of 8TB.
>
> If so, can anybody point me to any docs or examples on exactly how the
> Storage setup is done so that NFS will replicate across the hosts?
>
> If not what file system should I use to achieve this?
>
> Thanks
> Shane
> ___
> Users mailing list -- users@ovirt.org
> To unsubscribe send an email to users-le...@ovirt.org
> Privacy Statement: https://www.ovirt.org/site/privacy-policy/
> oVirt Code of Conduct:
> https://www.ovirt.org/community/about/community-guidelines/
> List Archives:
> https://lists.ovirt.org/archives/list/users@ovirt.org/message/5H4NDGUBBFYWI65KFNVJVVQO3O5HNPN2/
>
___
Users mailing list -- users@ovirt.org
To unsubscribe send an email to users-le...@ovirt.org
Privacy Statement: https://www.ovirt.org/site/privacy-policy/
oVirt Code of Conduct: 
https://www.ovirt.org/community/about/community-guidelines/
List Archives: 
https://lists.ovirt.org/archives/list/users@ovirt.org/message/CNTUCKKSZFUZCIOIJJRDGGNNMEPEXCCB/