[ovirt-users] High availability when both engine host and host with application vm failed

[Sergei Hanus]

I want to make a setup, when workload is distributed between two sites are
high availability mechanism protects from one site failure, restarting vms
on another site.

Scenario I use:
1. Poweroff hosted engine host, and then host with highly-available vm
2. Engine comes back on another site (which is fine).
3. What I expect, engine finds, that there's a host not available with HA
vms, and restart these vms on another host. But, I only see in logs, that
engine reports, that it cannot connect to that host
(java.net.NoRouteToHostException: No route to host).

Whel I poweroff just server with app vm, High Availability works correctly,
performs fencing and restarts vm on another host.

I use release 4.1 from RedHat.

Has anyone faced similar issue? And, if yes, how could that be
toubleshooted?

 Thank you in advance,

Sergei.
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Re: [ovirt-users] High Availability Setup with oVirt

[Yaniv Kaul]

On Tue, Aug 15, 2017 at 6:25 AM, Anantha Raghava <
rag...@exzatechconsulting.com> wrote:

> Hi,
>
> I am trying to setup ovirt clusters in two different locations and
> replicate the data between two sites so that in case of failure in primary
> site, I can bring the VM up in secondary site in quick time with minimum
> data loss. Can we do this oVirt?
>
> I was thinking of using DRBD, however read somewhere that oVirt plugins
> are still under development
>

How about Gluster geo-replication?
Y.


> --
>
> Thanks & Regards,
>
>
> Anantha Raghava
>
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>
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[ovirt-users] High Availability Setup with oVirt

[Anantha Raghava]

Hi,

I am trying to setup ovirt clusters in two different locations and 
replicate the data between two sites so that in case of failure in 
primary site, I can bring the VM up in secondary site in quick time with 
minimum data loss. Can we do this oVirt?


I was thinking of using DRBD, however read somewhere that oVirt plugins 
are still under development


--

Thanks & Regards,


Anantha Raghava


Do not print this e-mail unless required. Save Paper & trees.

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Re: [ovirt-users] high availability

[Nir Soffer]

On Fri, Feb 3, 2017 at 9:49 PM, Yaniv Kaul  wrote:
>
>
> On Fri, Feb 3, 2017 at 8:42 PM, cmc  wrote:
>>
>> Hi,
>>
>> I have some questions about oVirt's high availability features for
>> VMs. My understanding is that it relies on the engine host to monitor
>> and manage the hypervisor hosts, so that in the case of a
>> unrecoverable failure of one those hosts, it will fence the host and
>> migrate any VM that is designated as highly available to another host
>> in the cluster. However, if the engine is itself hosted as a VM on a
>> host that fails, this process cannot take place, as the engine will be
>> down and cannot initiate monitoring, fencing and migration - is that
>> correct?
>
>
> The hosted-engine has its own HA mechanism.

You may find this useful:
http://www.ovirt.org/documentation/self-hosted/Self-Hosted_Engine_Guide/

> In addition, in 4.1 we are introducing a feature which allows HA without
> fencing, in a similar manner to hosted-engine - by a lock on the storage
> side.

For more info on this see:
https://www.ovirt.org/develop/release-management/features/storage/vm-leases/

Nir

> Y.
>
>>
>> There is the option of hosting the engine externally on dedicated
>> hardware, or on another cluster, but then it is still a single point
>> of failure. I recall reading about plans for an HA engine in the
>> future though.
>>
>> Can someone tell me what the roadmap is? Is there a plan to put
>> something like an HA agent on all the hypervisors in the cluster so
>> there is no single point of failure?
>>
>> Thanks for any information,
>>
>> Cam
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>
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Re: [ovirt-users] high availability

[Yaniv Kaul]

On Fri, Feb 3, 2017 at 8:42 PM, cmc  wrote:

> Hi,
>
> I have some questions about oVirt's high availability features for
> VMs. My understanding is that it relies on the engine host to monitor
> and manage the hypervisor hosts, so that in the case of a
> unrecoverable failure of one those hosts, it will fence the host and
> migrate any VM that is designated as highly available to another host
> in the cluster. However, if the engine is itself hosted as a VM on a
> host that fails, this process cannot take place, as the engine will be
> down and cannot initiate monitoring, fencing and migration - is that
> correct?
>

The hosted-engine has its own HA mechanism.
In addition, in 4.1 we are introducing a feature which allows HA without
fencing, in a similar manner to hosted-engine - by a lock on the storage
side.
Y.


> There is the option of hosting the engine externally on dedicated
> hardware, or on another cluster, but then it is still a single point
> of failure. I recall reading about plans for an HA engine in the
> future though.
>
> Can someone tell me what the roadmap is? Is there a plan to put
> something like an HA agent on all the hypervisors in the cluster so
> there is no single point of failure?
>
> Thanks for any information,
>
> Cam
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[ovirt-users] high availability

[cmc]

Hi,

I have some questions about oVirt's high availability features for
VMs. My understanding is that it relies on the engine host to monitor
and manage the hypervisor hosts, so that in the case of a
unrecoverable failure of one those hosts, it will fence the host and
migrate any VM that is designated as highly available to another host
in the cluster. However, if the engine is itself hosted as a VM on a
host that fails, this process cannot take place, as the engine will be
down and cannot initiate monitoring, fencing and migration - is that
correct?

There is the option of hosting the engine externally on dedicated
hardware, or on another cluster, but then it is still a single point
of failure. I recall reading about plans for an HA engine in the
future though.

Can someone tell me what the roadmap is? Is there a plan to put
something like an HA agent on all the hypervisors in the cluster so
there is no single point of failure?

Thanks for any information,

Cam
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Re: [ovirt-users] high availability

[qinglong.d...@horebdata.cn]

Thanks! I'd like to try it out.
 
From: Yaniv Dary
Date: 2017-01-04 19:24
To: qinglong.d...@horebdata.cn
CC: users; Martin Sivak
Subject: Re: [ovirt-users] high availability
In oVirt 4.1 we are planning to allow VM leases that will allow you to restart 
HA VMs in this use case even without power management.
We would love some feedback on this on the latest tested build, if you want to 
try it out:
https://github.com/nirs/ovirt-site/blob/77669161397ebf4cc15c66e0e6876bc033384cfc/source/develop/release-management/features/virt/vm-failover-using-vm-leases.html.md

Yaniv Dary
Technical Product Manager
Red Hat Israel Ltd.
34 Jerusalem Road
Building A, 4th floor
Ra'anana, Israel 4350109
Tel : +972 (9) 7692306
8272306
Email: yd...@redhat.com
IRC : ydary

On Wed, Jan 4, 2017 at 11:33 AM, Martin Sivak <msi...@redhat.com> wrote:
Hi,

high availability requires power management to be configured properly for your 
hosts. The VM won't be restarted until we can ascertain the status of node2 
(because it can still be up).

The host is Non responsive, meaning we do not know if it is up or down. That is 
the reason we show the VM status as unknown.

You can fix that by configuring power management for node2 or by right clicking 
and selecting Confirm host has been rebooted menu option.

Regards

--
Martin Sivak
SLA / oVirt

On Wed, Jan 4, 2017 at 9:45 AM, qinglong.d...@horebdata.cn 
<qinglong.d...@horebdata.cn> wrote:
Hi, all
I have an ovirt 4.0 environment with two hosts and a hosted engine. The 
engine vm was running on host 1 and another vm was running on host2. Then I 
unpluged the power of host 2. The another vm should be supposed to restart on 
host 1 because of ha feature. But it couldn't. It stayed unknown status all the 
time. And the host 2 stayed non responsive status.

Did I understand ha correctly? Anyon can help? Thanks!

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Re: [ovirt-users] high availability

[Yaniv Dary]

In oVirt 4.1 we are planning to allow VM leases that will allow you to
restart HA VMs in this use case even without power management.
We would love some feedback on this on the latest tested build, if you want
to try it out:
https://github.com/nirs/ovirt-site/blob/77669161397ebf4cc15c66e0e6876bc033384cfc/source/develop/release-management/features/virt/vm-failover-using-vm-leases.html.md

Yaniv Dary
Technical Product Manager
Red Hat Israel Ltd.
34 Jerusalem Road
Building A, 4th floor
Ra'anana, Israel 4350109

Tel : +972 (9) 7692306
8272306
Email: yd...@redhat.com
IRC : ydary


On Wed, Jan 4, 2017 at 11:33 AM, Martin Sivak  wrote:

> Hi,
>
> high availability requires power management to be configured properly for
> your hosts. The VM won't be restarted until we can ascertain the status of
> node2 (because it can still be up).
>
> The host is Non responsive, meaning we do not know if it is up or down.
> That is the reason we show the VM status as unknown.
>
> You can fix that by configuring power management for node2 or by right
> clicking and selecting Confirm host has been rebooted menu option.
>
> Regards
>
> --
> Martin Sivak
> SLA / oVirt
>
> On Wed, Jan 4, 2017 at 9:45 AM, qinglong.d...@horebdata.cn <
> qinglong.d...@horebdata.cn> wrote:
>
>> Hi, all
>> I have an ovirt 4.0 environment with two hosts and a hosted
>> engine. The engine vm was running on host 1 and another vm was running on
>> host2. Then I unpluged the power of host 2. The another vm should be supposed
>> to restart on host 1 because of ha feature. But it couldn't. It stayed
>> unknown status all the time. And the host 2 stayed non responsive status.
>>
>> Did I understand ha correctly? Anyon can help? Thanks!
>>
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>>
>
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Re: [ovirt-users] high availability

[Martin Sivak]

Hi,

high availability requires power management to be configured properly for
your hosts. The VM won't be restarted until we can ascertain the status of
node2 (because it can still be up).

The host is Non responsive, meaning we do not know if it is up or down.
That is the reason we show the VM status as unknown.

You can fix that by configuring power management for node2 or by right
clicking and selecting Confirm host has been rebooted menu option.

Regards

--
Martin Sivak
SLA / oVirt

On Wed, Jan 4, 2017 at 9:45 AM, qinglong.d...@horebdata.cn <
qinglong.d...@horebdata.cn> wrote:

> Hi, all
> I have an ovirt 4.0 environment with two hosts and a hosted
> engine. The engine vm was running on host 1 and another vm was running on
> host2. Then I unpluged the power of host 2. The another vm should be supposed
> to restart on host 1 because of ha feature. But it couldn't. It stayed
> unknown status all the time. And the host 2 stayed non responsive status.
>
> Did I understand ha correctly? Anyon can help? Thanks!
>
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[ovirt-users] high availability

[qinglong.d...@horebdata.cn]

Hi, all
I have an ovirt 4.0 environment with two hosts and a hosted engine. The 
engine vm was running on host 1 and another vm was running on host2. Then I 
unpluged the power of host 2. The another vm should be supposed to restart on 
host 1 because of ha feature. But it couldn't. It stayed unknown status all the 
time. And the host 2 stayed non responsive status.

Did I understand ha correctly? Anyon can help? Thanks!
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