Re: [ovirt-users] oVirt HC setup question

[Sven Achtelik]

Hi,

I’ll go an create all the needed networks and continue with using these 
networks for gluster. Is it save to enable multipath again in an HC install to 
consume iscsi devices?

Thank you,

Sven

On Thu, Dec 8, 2016 at 2:58 PM, Yedidyah Bar David 
> wrote:
On Wed, Dec 7, 2016 at 6:46 PM, Sven Achtelik 
> wrote:
> Hi All,
>
>
>
> I’m planning to install oVirt 4 with the HC setup from this blogpost and did
> a demo setup.
>
>
>
> http://www.ovirt.org/blog/2016/08/up-and-running-with-ovirt-4-0-and-gluster-storage/
>
>
>
> I’ve managed to install everything just fine and thought that enabling a
> storage network would move all the bricks to that designated network, but it
> didn’t do anything.

What do you mean by this? AFAIK just "adding a network" should not do anything
in itself. If you refer to the section "Storage Network" from that post, then
it describes how to add the existing, pre-configured storage network, to the
engine management, not how to "create" it.

> I made that happen by destroying and recreating the
> volumes with entering the ip addresses of the storage network through the
> cli. Would that be the right way to do this ?

I'd say the right way is probably to plan beforehand and create your
storage network ahead. Choose nics for that, connect them to a separate vlan,
give them IP addresses, give these addresses names (different from the names
given to addresses of other nics), and use these names when configuring
the gluster storage.

> If that’s the case how could I
> move the engine bricks over to that network to get it off my ovirtmgmt
> bridge ?  Or is there may be more prefered way to complete the HC-Setup ?

If you provided IP addresses of the wrong nics and now want to change that,
then I have no idea - no personal experience with gluster. Adding Sahina
for this.

Once you have created the bricks with one network, changing it to another is a 
bit hard.
With latest version of gluster (3.9)  there's a command reset-brick that allows 
you to do that [1] - you will need to do this one brick at a time as the brick 
being reset will need to be killed first.
The safest way is to plan ahead and create your gluster volume using the 
network you wish to use.

[1] - https://bugzilla.redhat.com/show_bug.cgi?id=1266876


I suggest, in such cases, to always use names, never IP addresses. It's
a bit more maintenance work (of the dns and/or /etc/hosts), but provides
much more flexibility - if you used names, you can (in principle, didn't
try that myself) take everything down, change the names to point at the
IP addresses of the correct nics, then start all up.

Best,
--
Didi

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Re: [ovirt-users] oVirt HC setup question

[Sahina Bose]

On Thu, Dec 8, 2016 at 2:58 PM, Yedidyah Bar David  wrote:

> On Wed, Dec 7, 2016 at 6:46 PM, Sven Achtelik 
> wrote:
> > Hi All,
> >
> >
> >
> > I’m planning to install oVirt 4 with the HC setup from this blogpost and
> did
> > a demo setup.
> >
> >
> >
> > http://www.ovirt.org/blog/2016/08/up-and-running-with-ovirt-
> 4-0-and-gluster-storage/
> >
> >
> >
> > I’ve managed to install everything just fine and thought that enabling a
> > storage network would move all the bricks to that designated network,
> but it
> > didn’t do anything.
>
> What do you mean by this? AFAIK just "adding a network" should not do
> anything
> in itself. If you refer to the section "Storage Network" from that post,
> then
> it describes how to add the existing, pre-configured storage network, to
> the
> engine management, not how to "create" it.
>
> > I made that happen by destroying and recreating the
> > volumes with entering the ip addresses of the storage network through the
> > cli. Would that be the right way to do this ?
>
> I'd say the right way is probably to plan beforehand and create your
> storage network ahead. Choose nics for that, connect them to a separate
> vlan,
> give them IP addresses, give these addresses names (different from the
> names
> given to addresses of other nics), and use these names when configuring
> the gluster storage.
>
> > If that’s the case how could I
> > move the engine bricks over to that network to get it off my ovirtmgmt
> > bridge ?  Or is there may be more prefered way to complete the HC-Setup ?
>
> If you provided IP addresses of the wrong nics and now want to change that,
> then I have no idea - no personal experience with gluster. Adding Sahina
> for this.
>

Once you have created the bricks with one network, changing it to another
is a bit hard.
With latest version of gluster (3.9)  there's a command reset-brick that
allows you to do that [1] - you will need to do this one brick at a time as
the brick being reset will need to be killed first.

The safest way is to plan ahead and create your gluster volume using the
network you wish to use.

[1] - https://bugzilla.redhat.com/show_bug.cgi?id=1266876


>
> I suggest, in such cases, to always use names, never IP addresses. It's
> a bit more maintenance work (of the dns and/or /etc/hosts), but provides
> much more flexibility - if you used names, you can (in principle, didn't
> try that myself) take everything down, change the names to point at the
> IP addresses of the correct nics, then start all up.
>
> Best,
> --
> Didi
>
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Re: [ovirt-users] oVirt HC setup question

[Yedidyah Bar David]

On Wed, Dec 7, 2016 at 6:46 PM, Sven Achtelik  wrote:
> Hi All,
>
>
>
> I’m planning to install oVirt 4 with the HC setup from this blogpost and did
> a demo setup.
>
>
>
> http://www.ovirt.org/blog/2016/08/up-and-running-with-ovirt-4-0-and-gluster-storage/
>
>
>
> I’ve managed to install everything just fine and thought that enabling a
> storage network would move all the bricks to that designated network, but it
> didn’t do anything.

What do you mean by this? AFAIK just "adding a network" should not do anything
in itself. If you refer to the section "Storage Network" from that post, then
it describes how to add the existing, pre-configured storage network, to the
engine management, not how to "create" it.

> I made that happen by destroying and recreating the
> volumes with entering the ip addresses of the storage network through the
> cli. Would that be the right way to do this ?

I'd say the right way is probably to plan beforehand and create your
storage network ahead. Choose nics for that, connect them to a separate vlan,
give them IP addresses, give these addresses names (different from the names
given to addresses of other nics), and use these names when configuring
the gluster storage.

> If that’s the case how could I
> move the engine bricks over to that network to get it off my ovirtmgmt
> bridge ?  Or is there may be more prefered way to complete the HC-Setup ?

If you provided IP addresses of the wrong nics and now want to change that,
then I have no idea - no personal experience with gluster. Adding Sahina
for this.

I suggest, in such cases, to always use names, never IP addresses. It's
a bit more maintenance work (of the dns and/or /etc/hosts), but provides
much more flexibility - if you used names, you can (in principle, didn't
try that myself) take everything down, change the names to point at the
IP addresses of the correct nics, then start all up.

Best,
-- 
Didi
___
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[ovirt-users] oVirt HC setup question

[Sven Achtelik]

Hi All,

I'm planning to install oVirt 4 with the HC setup from this blogpost and did a 
demo setup.

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

I've managed to install everything just fine and thought that enabling a 
storage network would move all the bricks to that designated network, but it 
didn't do anything. I made that happen by destroying and recreating the volumes 
with entering the ip addresses of the storage network through the cli. Would 
that be the right way to do this ? If that's the case how could I move the 
engine bricks over to that network to get it off my ovirtmgmt bridge ?  Or is 
there may be more prefered way to complete the HC-Setup ?

Thank you,

Sven
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