Re: [ovirt-users] HA without Power Management

[Sebastian Greco]

Hi Yaniv,

Yes, the provider gives me access to the power management of the server, by
using the user web portal and their java applet (the provider is OVH, in
case you have worked with their enviroment). Sadly, their IPMI device is
connected to a non accesible network for me, but only accesible by those
"web" means of using their java appleat via the web user portal.

I'm not sure I'm fully understanding your workaround, sorry :/ In any case,
if 4.1 brings the functionality described (hope it does!) it would be more
than enough for my case. Also, I'll try to "play" with the ipmilan to see
if I can get someplace with it. As my main problem is that one of the hosts
is suddenly rebooting with apparently no software reason, what I'll try to
do is to as soon as the host becomes non-responsive, start sending the
"restart" command to it from my hosted-engine (which HA works no matter
power fencing). So, after the unexpected rebooting of the host, a
controlled reboot should take place allowing the VMs to power on in the
other host.

I'll try to make some time next week to give that a try. Hope it works!!!

Thank you guys :)
Seb
PS: Any estimated release date for 4.1? I never found any info in o-virt
project about next releases or "trello" like info to look forward to new
functionalities, etc.




Sebastián Greco
IT Consultant
Cloud Computing - Red Hat - VMware - Zimbra
www.essiprojects.com
*www.essiprojects.co.uk <http://www.essiprojects.co.uk>*

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On Wed, Nov 30, 2016 at 12:14 PM, Yaniv Kaul  wrote:

>
>
> On Tue, Nov 29, 2016 at 7:00 AM, Sebastian Greco 
> wrote:
>
>> Hi Oved!
>>
>> That's a perfect explanation. Do we have a release date for 4.1? I'm
>> currently working with RHV in my production enviroment.
>>
>> I may don't have the opportunity to wait for 4.1 to see the light as all
>> my customers VMs (im a web hoster) run on a non HA cluster as my provider
>> does not give me access to the IPMI. If anyone knows anyway to workaround
>> this limitation please do let me know.
>>
> Does he give you access to a smart power grid? If so, you can probably use
> that as a fencing mechanism. If there is no access via IPMI nor power, how
> can you cycle a stuck host?
>
> A not very good workaround is to run the VMs themselves pinned to
> different hosts with a clustering between them. I think it's a bad idea
> (wasteful), but it is HA. And in some applications it can be active-active.
> You can use virtio-SCSI with passthrough to do SCSI based fencing on a
> shared disk (quorum disk), for example.
>
> Y.
>
>
>> Thanks a lot!
>>
>> El 28 nov. 2016 9:12 p. m., "Oved Ourfali" 
>> escribió:
>>
>>> Hi Sebastian
>>>
>>> Currently in case a host is not responding, the only way to make sure no
>>> vms are running on it is to fence it, and we only support fencing through
>>> power management.
>>>
>>> In 4.1 we plan to have limited options for storage fencing. This will
>>> mean that if a host is not responding then we try to run HA VMs on another
>>> host. If the host is still up then it will fail, as the non responsive host
>>> is the one holding the lock. If, however, the host is really dead, then the
>>> run VM should succeed.
>>>
>>> So, a VM should be up and running, but it might run on a host that has
>>> connectivity issues.
>>>
>>> Better than what you have now, but still partial. I guess this might get
>>> improved during 4.2.
>>>
>>> Regards,
>>> Oved
>>>
>>> On Nov 28, 2016 18:29, "Sebastian Greco" 
>>> wrote:
>>>
>>>> Hi,
>>>>
>>>> Is there any way to have HA in a cluster which hosts have not got
>>>> configured the "Power Management"?
>>>>
>>>> In my scenario I have 2 hosts (v4) on OVH  and a hosted-engine to
>>>> manage them. Thing is that OVH does not allow direct communication with the
>>>> hosts IPMI interface. IPMI is only available in the "customer area" under a
>>>> java applet as that interface is connected to a non accesible network. So,
>>>> having no access to this interface I find myself in a situation in which I
>>>> lost all my HA functionality :(
>>>>
>>>> Any help would be more than welcome.
>>>>
>>>> Sebas
>>>>
>>>> ___
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>>>> Users@ovirt.org
>>>> http://lists.ovirt.org/mailman/listinfo/users
>>>>
>>>>
>> ___
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>> http://lists.ovirt.org/mailman/listinfo/users
>>
>>
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Re: [ovirt-users] HA without Power Management

[Sebastian Greco]

Hi Oved!

That's a perfect explanation. Do we have a release date for 4.1? I'm
currently working with RHV in my production enviroment.

I may don't have the opportunity to wait for 4.1 to see the light as all my
customers VMs (im a web hoster) run on a non HA cluster as my provider does
not give me access to the IPMI. If anyone knows anyway to workaround this
limitation please do let me know.

Thanks a lot!

El 28 nov. 2016 9:12 p. m., "Oved Ourfali"  escribió:

> Hi Sebastian
>
> Currently in case a host is not responding, the only way to make sure no
> vms are running on it is to fence it, and we only support fencing through
> power management.
>
> In 4.1 we plan to have limited options for storage fencing. This will mean
> that if a host is not responding then we try to run HA VMs on another host.
> If the host is still up then it will fail, as the non responsive host is
> the one holding the lock. If, however, the host is really dead, then the
> run VM should succeed.
>
> So, a VM should be up and running, but it might run on a host that has
> connectivity issues.
>
> Better than what you have now, but still partial. I guess this might get
> improved during 4.2.
>
> Regards,
> Oved
>
> On Nov 28, 2016 18:29, "Sebastian Greco"  wrote:
>
>> Hi,
>>
>> Is there any way to have HA in a cluster which hosts have not got
>> configured the "Power Management"?
>>
>> In my scenario I have 2 hosts (v4) on OVH  and a hosted-engine to manage
>> them. Thing is that OVH does not allow direct communication with the hosts
>> IPMI interface. IPMI is only available in the "customer area" under a java
>> applet as that interface is connected to a non accesible network. So,
>> having no access to this interface I find myself in a situation in which I
>> lost all my HA functionality :(
>>
>> Any help would be more than welcome.
>>
>> Sebas
>>
>> ___
>> Users mailing list
>> Users@ovirt.org
>> http://lists.ovirt.org/mailman/listinfo/users
>>
>>
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[ovirt-users] HA without Power Management

[Sebastian Greco]

Hi,

Is there any way to have HA in a cluster which hosts have not got
configured the "Power Management"?

In my scenario I have 2 hosts (v4) on OVH  and a hosted-engine to manage
them. Thing is that OVH does not allow direct communication with the hosts
IPMI interface. IPMI is only available in the "customer area" under a java
applet as that interface is connected to a non accesible network. So,
having no access to this interface I find myself in a situation in which I
lost all my HA functionality :(

Any help would be more than welcome.

Sebas
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Re: [ovirt-users] Local storage & shared in same cluster

[Sebastian Greco]

Thx for the advice Barak!

I was looking for a roadmap to follow, like the "trello" one used for the
openshift project https://trello.com/b/nlLwlKoz/atomicopenshift-roadmap but
I was not able to find one. I love to hear things like the "SPM was planned
to be removed" as it gives me a better understanding of the direction the
project has. Any good resource to follow this and other things to come?

Thanks again for the help!


Sebastián Greco
IT Consultant
Cloud Computing - Red Hat - VMware - Zimbra
www.essiprojects.com
*www.essiprojects.co.uk <http://www.essiprojects.co.uk>*

Pl. Prim, 4-5 Pral 2a · T:+34 977 221 182 · M: +34 619 985 161 F: +34 977
230 170 · 43001 Tarragona Spain
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 UK

On Mon, Oct 31, 2016 at 9:36 AM, Barak Korren  wrote:

> On 31 October 2016 at 09:28, Sebastian Greco 
> wrote:
> >
> > On Sun, Oct 30, 2016 at 10:42 AM, Barak Korren 
> wrote:
> >>
> >> VMs are not
> >> very interesting as a use case for RHV customers. When y
> >
> >
> > Thx for the answsers. I see that it's the second time that someone from
> RH
> > points out that customers are not interested in this feature. While I
> can't
> > argue with that, what I do can say is that "non-customers" (most of
> > companies out there using vsphere or hyper-v) feel dissapointed towards
> this
> > solution for things like this one (for this case, 2 of my customers are
> > missing this, we are deploying RHV to one of them this week).
>
> Please don't take my statement as being official in any way. Despite
> writing from a @redhat.com address, I'm writing my personal thoughts.
>
> I have stated that I've no data to back what I've said. This is all
> just a guess based on what I know of oVirt/RHV development processes.
> I'm most certainly not someone who makes decisions about any of theses
> things.
>
> > I don't see how this lack of flexibility is something good, and so far
> from
> > my experience with customers which I'm trying to convince to start using
> > RHV, when they finally do agree to start with one or two servers
> (following
> > the RHCI roadmap evolution to the hybrid cloud), they see things like
> this
> > and dismiss this solution sooner than later.
>
> Please do not take my statement as indicating of any conscious design
> decision. I was just trying to gauge where oVirt/RHV development might
> head given that RedHat typically puts its resources where its current
> and potential customers tell it do. Case to point:
>
> 1. Ephemeral local state VMs are supported with the scrathcpad hook because
>its been shown to be useful for Build/Test/CI systems.
> 2. Singular host with local storage and non-migrating VMs is supported for
>cases where one simply wants resource convergence.
>
> The 3rd case we're discussing here where the same host can run both
> local persistent VMs and migrating ones had not been supported so far.
> I'm __guessing__ that this is because demand seen so far did not
> outweigh
> the technical difficulty to achieve this (Just to indicate the difficulty,
> the SPM was planned to be removed in 4.0, it did not make it).
>
> > Anyways, question has been answer "yes, is technically possible but by
> > design it is not going to happen", and I wouldn't like to convert this
> > thread or abuse your kindness deviating the subject :)
>
> This is definitely not the bottom line, I way trying to guess and
> explain why this __did_not__ happen __so_far__. I never meant to say
> it will not.
>
> If you are a RHV reseller or integrator, your input is very valuable
> for RedHat. While this list is one way to reach some RedHat
> developers, you should certainly make an effort to use other channels
> available to you to make your input known.
>
>
> --
> Barak Korren
> bkor...@redhat.com
> RHEV-CI Team
>
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Re: [ovirt-users] Local storage & shared in same cluster

[Sebastian Greco]

Maybe I missread, sorry. I interpreted that by design this was not a
feature and that it was not in any roadmap as current customers don't need
it, or at least I understood that from previous posts.

Happy to know this is planned to be a feature! :)

Again guys, thanks a lot for the help!


Sebastián Greco
IT Consultant
Cloud Computing - Red Hat - VMware - Zimbra
www.essiprojects.com
*www.essiprojects.co.uk <http://www.essiprojects.co.uk>*

Pl. Prim, 4-5 Pral 2a · T:+34 977 221 182 · M: +34 619 985 161 F: +34 977
230 170 · 43001 Tarragona Spain
120 Pall Mall · T:+44 207 101 0778 · F: +44 843 538 3112 · SW1Y 5ED *London*
 UK

On Mon, Oct 31, 2016 at 8:59 AM, Yedidyah Bar David  wrote:

> On Mon, Oct 31, 2016 at 9:28 AM, Sebastian Greco
>  wrote:
> >
> > On Sun, Oct 30, 2016 at 10:42 AM, Barak Korren 
> wrote:
> >>
> >> VMs are not
> >> very interesting as a use case for RHV customers. When y
> >
> >
> > Thx for the answsers. I see that it's the second time that someone from
> RH
> > points out that customers are not interested in this feature. While I
> can't
> > argue with that, what I do can say is that "non-customers" (most of
> > companies out there using vsphere or hyper-v) feel dissapointed towards
> this
> > solution for things like this one (for this case, 2 of my customers are
> > missing this, we are deploying RHV to one of them this week).
> >
> > I don't see how this lack of flexibility is something good, and so far
> from
> > my experience with customers which I'm trying to convince to start using
> > RHV, when they finally do agree to start with one or two servers
> (following
> > the RHCI roadmap evolution to the hybrid cloud), they see things like
> this
> > and dismiss this solution sooner than later.
> >
> > Anyways, question has been answer "yes, is technically possible but by
> > design it is not going to happen",
>
> Not sure how you got this impression from current discussion. On the
> contrary - people are working on this, and it was planned to be completed
> in 4.0, but eventually postponed.
>
> Best,
>
> > and I wouldn't like to convert this
> > thread or abuse your kindness deviating the subject :)
> >
> > Thx again guys for the help,
> >
> >
> >
> > ___
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> > Users@ovirt.org
> > http://lists.ovirt.org/mailman/listinfo/users
> >
>
>
>
> --
> Didi
>
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Re: [ovirt-users] Local storage & shared in same cluster

[Sebastian Greco]

On Sun, Oct 30, 2016 at 10:42 AM, Barak Korren  wrote:

> VMs are not
> very interesting as a use case for RHV customers. When y
>

Thx for the answsers. I see that it's the second time that someone from RH
points out that customers are not interested in this feature. While I can't
argue with that, what I do can say is that "non-customers" (most of
companies out there using vsphere or hyper-v) feel dissapointed towards
this solution for things like this one (for this case, 2 of my customers
are missing this, we are deploying RHV to one of them this week).

I don't see how this lack of flexibility is something good, and so far from
my experience with customers which I'm trying to convince to start using
RHV, when they finally do agree to start with one or two servers (following
the RHCI roadmap evolution to the hybrid cloud), they see things like this
and dismiss this solution sooner than later.

Anyways, question has been answer "yes, is technically possible but by
design it is not going to happen", and I wouldn't like to convert this
thread or abuse your kindness deviating the subject :)

Thx again guys for the help,
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Re: [ovirt-users] Local storage & shared in same cluster

[Sebastian Greco]

Ohh thx for the answer :) That's why the running VMs on that particular
storage would only run on that host. One can do that in other hypervisors
like vsphere or hyper-v. It would be a nice thing to have in rhv too imho.


On Thu, Oct 27, 2016 at 12:44 PM, Elad Ben Aharon 
wrote:

> By design, host local storage is accessible from the host itself only and
> that's why it cannot be used in shared storage Data Centres.
>
> On Thu, Oct 27, 2016 at 9:59 AM, Sebastian Greco 
> wrote:
>
>> Hi,
>>
>> Is there a technical reason for not being able to use the local host
>> storage if that host is already in a cluster with shared storage?
>>
>> For instance, if a user has a server with with a lot of storage and he
>> wants to use that storage for non HA VMs that will only run over that host
>> while, that host is also part of a cluster running VMs in a shared storage.
>>
>> If there's no technical reason/limitation behind this and this is a
>> design choice, do you consider this to be in a roadmap?
>>
>> Thanks!
>>
>> Sebastián Greco
>> IT Consultant
>> Cloud Computing - Red Hat - VMware - Zimbra
>> www.essiprojects.com
>> *www.essiprojects.co.uk <http://www.essiprojects.co.uk>*
>>
>> Pl. Prim, 4-5 Pral 2a · T:+34 977 221 182 · M: +34 619 985 161 F: +34
>> 977 230 170 · 43001 Tarragona Spain
>> 120 Pall Mall · T:+44 207 101 0778 · F: +44 843 538 3112 · SW1Y 5ED
>> *London* UK
>>
>> ___
>> Users mailing list
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>>
>>
>
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[ovirt-users] Local storage & shared in same cluster

[Sebastian Greco]

Hi,

Is there a technical reason for not being able to use the local host
storage if that host is already in a cluster with shared storage?

For instance, if a user has a server with with a lot of storage and he
wants to use that storage for non HA VMs that will only run over that host
while, that host is also part of a cluster running VMs in a shared storage.

If there's no technical reason/limitation behind this and this is a design
choice, do you consider this to be in a roadmap?

Thanks!

Sebastián Greco
IT Consultant
Cloud Computing - Red Hat - VMware - Zimbra
www.essiprojects.com
*www.essiprojects.co.uk *

Pl. Prim, 4-5 Pral 2a · T:+34 977 221 182 · M: +34 619 985 161 F: +34 977
230 170 · 43001 Tarragona Spain
120 Pall Mall · T:+44 207 101 0778 · F: +44 843 538 3112 · SW1Y 5ED *London*
 UK
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