[ovirt-users] Re: HCI Disaster Recovery

2020-01-11 Thread Alex K
On Fri, Jan 10, 2020, 20:12 Christian Reiss 
wrote:

> Hey,
>
> is there really no ovirt native way to restore a single host and bring
> it back into the cluster?
>
I'm not sure if all can be done from gui. I would manually configure
gluster and do the host install from gui.

>
> -Chris.
>
> On 07.01.2020 09:54, Christian Reiss wrote:
> > Hey folks,
> >
> >- theoretical question, no live data in jeopardy -
> >
> > Let's say a 3-way HCI cluster is up and running, with engine running,
> > all is well. The setup was done via gui, including gluster.
> >
> > Now I would kill a host, poweroff & disk wipe. Simulating a full node
> > failure.
> >
> > The remaining nodes should keep running on (3 copy sync, no arbiter),
> > vms keep running or will be restarted. I would reinstall using the ovirt
> > node installer on the "failed" node.
> >
> > This would net me with a completely empty, no-gluster setup. What is the
> > oVirt way to recover from this point onward?
> >
> > Thanks for your continued support! <3
> > -Christian.
> >
>
> --
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[ovirt-users] Re: HCI Disaster Recovery

2020-01-10 Thread Strahil
It's actually not so easy.

The fastest way to recover  is just restore  from backup.
Otherwise  the flow  should  be:
1.  Install the new  node  (new hostname will be  easier).
2.  Use gluster's  replace-brick to change the dead brick with new one.
3.  Once ovirt 's  integration with gluster  detects the change, you will be 
able to forcefully remove  the  dead node.
4. Add  the newly installed node  to the relevant cluster (with or  without 
hosted-engine deployment)
5.  Test to move a low-priority VM to the new  host.
6.  Power  up  a test VM on the new host to test the functionality.
7. You can make the new node SPM and test snapahots and new vm creation.

As  you can see , in order to remove a missing node  - it should not be part of 
the Gluster Cluster.

Best Regards,
Strahil NikolovOn Jan 10, 2020 20:10, Christian Reiss wrote: > > Hey, > > is 
there really no ovirt native way to restore a single host and bring > it back 
into the cluster? > > -Chris. > > On 07.01.2020 09:54, Christian Reiss wrote: > 
> Hey folks, > > > >    - theoretical question, no live data in jeopardy - > > 
> > Let's say a 3-way HCI cluster is up and running, with engine running, > > 
all is well. The setup was done via gui, including gluster. > > > > Now I would 
kill a host, poweroff & disk wipe. Simulating a full node > > failure. > > > > 
The remaining nodes should keep running on (3 copy sync, no arbiter), > > vms 
keep running or will be restarted. I would reinstall using the ovirt > > node 
installer on the "failed" node. > > > > This would net me with a completely 
empty, no-gluster setup. What is the > > oVirt way to recover from this point 
onward? > > > > Thanks for your continued support! <3 > > -Christian. > > > > 
-- > Christian Reiss - em...@christian-reiss.de /"\  ASCII Ribbon > 
    christ...@reiss.nrw  \ /    Campaign >  
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ch...@alpha-labs.net  / \   in eMails >   WEB  
christian-reiss.de, reiss.nrw > >   GPG Retrieval http://gpg.christian-reiss.de 
>   GPG ID ABCD43C5, 0x44E29126ABCD43C5 >   GPG fingerprint = 9549 F537 2596 
86BA 733C  A4ED 44E2 9126 ABCD 43C5 > >   "It's better to reign in hell than to 
serve in heaven.", >    John Milton, 
Paradise lost. > ___ > Users 
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[ovirt-users] Re: HCI Disaster Recovery

2020-01-10 Thread Christian Reiss

Hey,

is there really no ovirt native way to restore a single host and bring 
it back into the cluster?


-Chris.

On 07.01.2020 09:54, Christian Reiss wrote:

Hey folks,

   - theoretical question, no live data in jeopardy -

Let's say a 3-way HCI cluster is up and running, with engine running, 
all is well. The setup was done via gui, including gluster.


Now I would kill a host, poweroff & disk wipe. Simulating a full node 
failure.


The remaining nodes should keep running on (3 copy sync, no arbiter), 
vms keep running or will be restarted. I would reinstall using the ovirt 
node installer on the "failed" node.


This would net me with a completely empty, no-gluster setup. What is the 
oVirt way to recover from this point onward?


Thanks for your continued support! <3
-Christian.



--
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   christ...@reiss.nrw  \ /Campaign
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 "It's better to reign in hell than to serve in heaven.",
  John Milton, Paradise lost.
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