2:04 p.m.
--_000_87E152BF0D55124F8311754D69D209F67BE51E32MSEX01FRA9corps_
Content-Type: text/plain; charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable
Hello oVirt guru out there:
I want to seek some advice on upgrade path for our oVirt management vm conf=
iguration. We have been using oVirt for over 3 years. When we first setup=
oVirt environment, Hosted Engine componment did not exist. Our question i=
s should we migrate our current configuration to use Hosted Engine?
First let me give an overview of our configuration. We have blade servers =
in 2 separate racks. D1 & X1. Each side has 10 blades. Storage is iSCSI =
SAN.
Inside our oVirt 3.5.0.1-1.el6 installation, it is configured with 2 data c=
enters. D1 & X1. Each datacenter has the 10 blades for that side. The ma=
nagement function of oVirt (oVirt web console) is running off 2 VMs, ovirt-=
mgmt-1 on D1, and ovirt-mgmt-2 on X1. We have keepalived to maintain a flo=
wing IP for the oVirt management console. The keepalived script makes sure=
only one copy of ovirt-engine is running at any time. It can be on D1 or =
X1. The mgmt VMs have Postgresql setup in replication mode. In case one o=
f the mgmt vm failed, the other mgmt vm on the other rack can pick up the m=
gmt role. Both mgmt VMs can see all blades and SAN resources on D1 & X1.
This configuration has been working well for us. The drawback is if both o=
virt mgmt vm crashed, we will not be able to start them or make any change =
to the ovirt environment. It is because the mgmt VMs are running within th=
e oVirt domain.
We tried to upgrade our configuration to Hosted Engine configuration. From=
what I understand, the Hosted Engine will run in a separate storage domain=
. In both times we tried to upgrade to Hosted Engine, they both failed dur=
ing export and import of current configuration.
I think my questions are:
- will the Hosted Engine model works in our hardware configuration. With h=
ardware in 2 racks, D1 & X1. Can a single Hosted Engine manage hardware on=
both sides?
- How can we achieve redundancy when running Hosted Engine? We need to hav=
e management capibility in case one side completely failed.
Thanks in advance.
Eric
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<html dir=3D"ltr">
<head>
<meta http-equiv=3D"Content-Type" content=3D"text/html;
charset=3Diso-8859-=
1">
<style type=3D"text/css"></style><style
type=3D"text/css" id=3D"owaParaStyl=
e"></style><style type=3D"text/css"></style>
</head>
<body fpstyle=3D"1" ocsi=3D"0">
<div style=3D"direction: ltr;font-family: Tahoma;color: #000000;font-size: =
10pt;">
<div style=3D"font-family: Helvetica; font-size: 11px;"><span
style=3D"font=
-size: 15px;"><span style=3D"font-family: Calibri,
sans-serif;">Hello oVirt=
guru out there:</span></span></div>
<div style=3D"font-family: Helvetica; font-size: 11px;"><span
style=3D"font=
-size: 15px;"><span style=3D"font-family: Calibri,
sans-serif;"><br>
</span></span></div>
<div style=3D"font-size: 11px; font-family: Calibri, sans-serif;"><span
sty=
le=3D"font-size: 15px;">I want to seek some advice on upgrade path for our =
oVirt management vm configuration. We have been using oVirt for over =
3 years. When we first setup oVirt environment,
Hosted Engine componment did not exist. Our question is should we mi=
grate our current configuration to use Hosted
Engine? </sp=
an></div>
<div style=3D"font-family: Helvetica; font-size: 11px;"><br>
</div>
<div style=3D"font-size: 15px; font-family: Calibri, sans-serif;">First
let=
me give an overview of our configuration. We have blade servers in 2=
separate racks. D1 & X1. Each side has 10 blades.
St=
orage is iSCSI SAN. </div>
<div style=3D"font-family: Helvetica; font-size: 11px;"><br>
</div>
<div style=3D"font-size: 15px; font-family: Calibri, sans-serif;">
<div>Inside our oVirt 3.5.0.1-1.el6 installation, it is configured wit=
h 2 data centers. D1 & X1. Each datacenter has the 10 blade=
s for that side. The management function of oVirt (oVirt web console)=
is running off 2 VMs, ovirt-mgmt-1 on D1, and ovirt-mgmt-2
on X1. We have keepalived to maintain a flowing IP for the oVirt man=
agement console. The keepalived script makes sure only one copy of ov=
irt-engine is running at any time. It can be on D1 or X1. The m=
gmt VMs have Postgresql setup in replication mode. In
case one of the mgmt vm failed, the other mgmt vm on the other rack can pi=
ck up the mgmt role. Both mgmt VMs can see all blades and SAN&nb=
sp;resources on D1 & X1.</div>
<div><br>
</div>
<div>This configuration has been working well for us. The drawback is=
if both ovirt mgmt vm crashed, we will not be able to start them or make a=
ny change to the ovirt environment. It is because the mgmt VMs are ru=
nning within the oVirt domain.</div>
<div><br>
</div>
<div>We tried to upgrade our configuration to Hosted Engine configuration. =
From what I understand, the Hosted Engine will run in a separate stor=
age domain. In both times we tried to upgrade to Hosted Engine, =
they both failed during export and import of current
configuration.</div>
<div><br>
</div>
<div>I think my questions are:</div>
<div>- will the Hosted Engine model works in our hardware configuration. &n=
bsp;With hardware in 2 racks, D1 & X1. Can a single Hosted Engine=
manage hardware on both sides?</div>
<div>- How can we achieve redundancy when running Hosted Engine?
=
We need to have management capibility in case one side completely fai=
led.</div>
<div><br>
</div>
<div>Thanks in advance.</div>
<div>Eric </div>
</div>
</div>
</body>
</html>
--_000_87E152BF0D55124F8311754D69D209F67BE51E32MSEX01FRA9corps_--
7:02 a.m.
----- Original Message -----
From: "Eric Wong" <Eric.Wong(a)solvians.com>
To: users(a)ovirt.org
Sent: Thursday, March 19, 2015 7:04:04 PM
Subject: [ovirt-users] Hosted Engine config in our hardware environment
Hello oVirt guru out there:
I want to seek some advice on upgrade path for our oVirt management vm
configuration. We have been using oVirt for over 3 years. When we first
setup oVirt environment, Hosted Engine componment did not exist. Our
question is should we migrate our current configuration to use Hosted
Engine?
First let me give an overview of our configuration. We have blade servers in
2 separate racks. D1 & X1. Each side has 10 blades. Storage is iSCSI SAN.
Inside our oVirt 3.5.0.1-1.el6 installation, it is configured with 2 data
centers. D1 & X1. Each datacenter has the 10 blades for that side. The
management function of oVirt (oVirt web console) is running off 2 VMs,
ovirt-mgmt-1 on D1, and ovirt-mgmt-2 on X1. We have keepalived to maintain a
flowing IP for the oVirt management console. The keepalived script makes
sure only one copy of ovirt-engine is running at any time. It can be on D1
or X1. The mgmt VMs have Postgresql setup in replication mode. In case one
of the mgmt vm failed, the other mgmt vm on the other rack can pick up the
mgmt role. Both mgmt VMs can see all blades and SAN resources on D1 & X1.
This configuration has been working well for us. The drawback is if both
ovirt mgmt vm crashed, we will not be able to start them or make any change
to the ovirt environment. It is because the mgmt VMs are running within the
oVirt domain.
We tried to upgrade our configuration to Hosted Engine configuration. From
what I understand, the Hosted Engine will run in a separate storage domain.
In both times we tried to upgrade to Hosted Engine, they both failed during
export and import of current configuration.
I think my questions are:
- will the Hosted Engine model works in our hardware configuration. With
hardware in 2 racks, D1 & X1. Can a single Hosted Engine manage hardware on
both sides?
Yes it can.
- How can we achieve redundancy when running Hosted Engine? We need
to have
management capibility in case one side completely failed.
With hosted engine you are going to have a single VM managing three data-center: D1, X1
and an hosted-engine specific one.
The hosted-engine datacenter will use an additional shared storage domain (with 3.5 iSCSI
is fine) dedicated to hosted engine. On each host you are deploying hosted-engine on (2 o
3 hosts), an agent for HA will be installed: it's up to that agent to monitor the
status on the engine VM and restart it (with the needed locking mechanism to have just one
copy of it running) if the host were it was previously running has crashed.
So ovirt-hosted-engine-ha will ensure HA for the engine VM without the need to have to
copy of that with a replicated DB.
Thanks in advance.
Eric
_______________________________________________
Users mailing list
Users(a)ovirt.org
http://lists.ovirt.org/mailman/listinfo/users
7:06 a.m.
----- Original Message -----
From: "Eric Wong" <Eric.Wong(a)solvians.com>
To: users(a)ovirt.org
Sent: Thursday, March 19, 2015 7:04:04 PM
Subject: [ovirt-users] Hosted Engine config in our hardware environment
Hello oVirt guru out there:
I want to seek some advice on upgrade path for our oVirt management vm
configuration. We have been using oVirt for over 3 years. When we first
setup oVirt environment, Hosted Engine componment did not exist. Our
question is should we migrate our current configuration to use Hosted
Engine?
First let me give an overview of our configuration. We have blade servers in
2 separate racks. D1 & X1. Each side has 10 blades. Storage is iSCSI SAN.
Inside our oVirt 3.5.0.1-1.el6 installation, it is configured with 2 data
centers. D1 & X1. Each datacenter has the 10 blades for that side. The
management function of oVirt (oVirt web console) is running off 2 VMs,
ovirt-mgmt-1 on D1, and ovirt-mgmt-2 on X1. We have keepalived to maintain a
flowing IP for the oVirt management console. The keepalived script makes
sure only one copy of ovirt-engine is running at any time. It can be on D1
or X1. The mgmt VMs have Postgresql setup in replication mode. In case one
of the mgmt vm failed, the other mgmt vm on the other rack can pick up the
mgmt role. Both mgmt VMs can see all blades and SAN resources on D1 & X1.
This configuration has been working well for us. The drawback is if both
ovirt mgmt vm crashed, we will not be able to start them or make any change
to the ovirt environment. It is because the mgmt VMs are running within the
oVirt domain.
We tried to upgrade our configuration to Hosted Engine configuration. From
what I understand, the Hosted Engine will run in a separate storage domain.
In both times we tried to upgrade to Hosted Engine, they both failed during
export and import of current configuration.
Here you can find some hint about how to migrate to hosted-engine:
http://www.ovirt.org/Migrate_to_Hosted_Engine
I think my questions are:
- will the Hosted Engine model works in our hardware configuration. With
hardware in 2 racks, D1 & X1. Can a single Hosted Engine manage hardware on
both sides?
- How can we achieve redundancy when running Hosted Engine? We need to have
management capibility in case one side completely failed.
Thanks in advance.
Eric
_______________________________________________
Users mailing list
Users(a)ovirt.org
http://lists.ovirt.org/mailman/listinfo/users
4:36 a.m.
Simone:
Thanks for your quick respond. It clarified some of the confusion I have with the
hosted-engine.
However, I still have one question. Sorry. It is my bad that I did not explain clearer
on our hardware configuration, mainly on the SAN. We also have 2 SAN, one on D1 &
another one on X1. The blades on D1 can only see the storage in SAN D1. X1 blades can
only see SAN X1.
Does it mean that we will need to manage our oVirt environment separately when we switch
to use hosted-engine? Because from your explanation, the hosted-engine in selected nodes
will use separate iSCSI hosted-engine storage to store the DB. Since there is no cross D1
& X1 storage in our current config, that means we need separate hosted-engine setup on
each side.
Thanks,
Eric
-----Original Message-----
From: Simone Tiraboschi [mailto:stirabos@redhat.com]
Sent: Friday, March 20, 2015 7:06 PM
To: Eric Wong
Cc: users(a)ovirt.org
Subject: Re: [ovirt-users] Hosted Engine config in our hardware environment
----- Original Message -----
From: "Eric Wong" <Eric.Wong(a)solvians.com>
To: users(a)ovirt.org
Sent: Thursday, March 19, 2015 7:04:04 PM
Subject: [ovirt-users] Hosted Engine config in our hardware environment
Hello oVirt guru out there:
I want to seek some advice on upgrade path for our oVirt management vm
configuration. We have been using oVirt for over 3 years. When we first
setup oVirt environment, Hosted Engine componment did not exist. Our
question is should we migrate our current configuration to use Hosted
Engine?
First let me give an overview of our configuration. We have blade servers in
2 separate racks. D1 & X1. Each side has 10 blades. Storage is iSCSI SAN.
Inside our oVirt 3.5.0.1-1.el6 installation, it is configured with 2 data
centers. D1 & X1. Each datacenter has the 10 blades for that side. The
management function of oVirt (oVirt web console) is running off 2 VMs,
ovirt-mgmt-1 on D1, and ovirt-mgmt-2 on X1. We have keepalived to maintain a
flowing IP for the oVirt management console. The keepalived script makes
sure only one copy of ovirt-engine is running at any time. It can be on D1
or X1. The mgmt VMs have Postgresql setup in replication mode. In case one
of the mgmt vm failed, the other mgmt vm on the other rack can pick up the
mgmt role. Both mgmt VMs can see all blades and SAN resources on D1 & X1.
This configuration has been working well for us. The drawback is if both
ovirt mgmt vm crashed, we will not be able to start them or make any change
to the ovirt environment. It is because the mgmt VMs are running within the
oVirt domain.
We tried to upgrade our configuration to Hosted Engine configuration. From
what I understand, the Hosted Engine will run in a separate storage domain.
In both times we tried to upgrade to Hosted Engine, they both failed during
export and import of current configuration.
Here you can find some hint about how to migrate to hosted-engine:
http://www.ovirt.org/Migrate_to_Hosted_Engine
I think my questions are:
- will the Hosted Engine model works in our hardware configuration. With
hardware in 2 racks, D1 & X1. Can a single Hosted Engine manage hardware on
both sides?
- How can we achieve redundancy when running Hosted Engine? We need to have
management capibility in case one side completely failed.
Thanks in advance.
Eric
_______________________________________________
Users mailing list
Users(a)ovirt.org
http://lists.ovirt.org/mailman/listinfo/users
5:10 a.m.
----- Original Message -----
From: "Eric Wong" <Eric.Wong(a)solvians.com>
To: "Simone Tiraboschi" <stirabos(a)redhat.com>
Cc: users(a)ovirt.org
Sent: Tuesday, March 24, 2015 9:36:11 AM
Subject: RE: [ovirt-users] Hosted Engine config in our hardware environment
Simone:
Thanks for your quick respond. It clarified some of the confusion I have
with the hosted-engine.
However, I still have one question. Sorry. It is my bad that I did not
explain clearer on our hardware configuration, mainly on the SAN. We also
have 2 SAN, one on D1 & another one on X1. The blades on D1 can only see
the storage in SAN D1. X1 blades can only see SAN X1.
Does it mean that we will need to manage our oVirt environment separately
when we switch to use hosted-engine? Because from your explanation, the
hosted-engine in selected nodes will use separate iSCSI hosted-engine
storage to store the DB.
With hosted engine not only the DB but all the engine VM is going to be stored on a
dedicated iSCSI LUN so each host involved (not managed by) in hosted-engine should be able
to access that device in order to be able to start the engine VM after other host
failures.
So, if you want to have it restarting the engine VM on a X1 host after a complete failure
of D1 rack, you need to store the engine VM on a location that is accessible both by D1
and X1.
NFS could be an option too.
Otherwise you should check your storage path design in order to have a cross rack path;
you could also evaluate iSCSI multipathing.
Since there is no cross D1 & X1 storage in our
current config, that means we need separate hosted-engine setup on each
side.
Thanks,
Eric
-----Original Message-----
From: Simone Tiraboschi [mailto:stirabos@redhat.com]
Sent: Friday, March 20, 2015 7:06 PM
To: Eric Wong
Cc: users(a)ovirt.org
Subject: Re: [ovirt-users] Hosted Engine config in our hardware environment
----- Original Message -----
> From: "Eric Wong" <Eric.Wong(a)solvians.com>
> To: users(a)ovirt.org
> Sent: Thursday, March 19, 2015 7:04:04 PM
> Subject: [ovirt-users] Hosted Engine config in our hardware environment
>
> Hello oVirt guru out there:
>
> I want to seek some advice on upgrade path for our oVirt management vm
> configuration. We have been using oVirt for over 3 years. When we first
> setup oVirt environment, Hosted Engine componment did not exist. Our
> question is should we migrate our current configuration to use Hosted
> Engine?
>
> First let me give an overview of our configuration. We have blade servers
> in
> 2 separate racks. D1 & X1. Each side has 10 blades. Storage is iSCSI SAN.
>
> Inside our oVirt 3.5.0.1-1.el6 installation, it is configured with 2 data
> centers. D1 & X1. Each datacenter has the 10 blades for that side. The
> management function of oVirt (oVirt web console) is running off 2 VMs,
> ovirt-mgmt-1 on D1, and ovirt-mgmt-2 on X1. We have keepalived to maintain
> a
> flowing IP for the oVirt management console. The keepalived script makes
> sure only one copy of ovirt-engine is running at any time. It can be on D1
> or X1. The mgmt VMs have Postgresql setup in replication mode. In case one
> of the mgmt vm failed, the other mgmt vm on the other rack can pick up the
> mgmt role. Both mgmt VMs can see all blades and SAN resources on D1 & X1.
>
> This configuration has been working well for us. The drawback is if both
> ovirt mgmt vm crashed, we will not be able to start them or make any change
> to the ovirt environment. It is because the mgmt VMs are running within the
> oVirt domain.
>
> We tried to upgrade our configuration to Hosted Engine configuration. From
> what I understand, the Hosted Engine will run in a separate storage domain.
> In both times we tried to upgrade to Hosted Engine, they both failed during
> export and import of current configuration.
Here you can find some hint about how to migrate to hosted-engine:
http://www.ovirt.org/Migrate_to_Hosted_Engine
> I think my questions are:
> - will the Hosted Engine model works in our hardware configuration. With
> hardware in 2 racks, D1 & X1. Can a single Hosted Engine manage hardware on
> both sides?
> - How can we achieve redundancy when running Hosted Engine? We need to have
> management capibility in case one side completely failed.
>
> Thanks in advance.
> Eric
>
> _______________________________________________
> Users mailing list
> Users(a)ovirt.org
> http://lists.ovirt.org/mailman/listinfo/users
>
7:12 a.m.
Simone:
I discussed with our SAN guy. We currently is not able to configure the SAN in D1 &
X1 to be seen by blades in both sides. So we are pretty much stuck with our current ovirt
mgmt. vms configuration.
I guess the main concern is how to control all the virtual machines with oVirt
infrastructure if both our ovirt-mgmt vms went down, how can we start them up again. That
also applies to any virtual machines. If the oVirt mgmt infrastructure is not able, I
think there is no way to start a VM, correct?
Again, Many Thanks,
Eric
-----Original Message-----
From: Simone Tiraboschi [mailto:stirabos@redhat.com]
Sent: Tuesday, March 24, 2015 5:11 PM
To: Eric Wong
Cc: users(a)ovirt.org
Subject: Re: [ovirt-users] Hosted Engine config in our hardware environment
----- Original Message -----
From: "Eric Wong" <Eric.Wong(a)solvians.com>
To: "Simone Tiraboschi" <stirabos(a)redhat.com>
Cc: users(a)ovirt.org
Sent: Tuesday, March 24, 2015 9:36:11 AM
Subject: RE: [ovirt-users] Hosted Engine config in our hardware environment
Simone:
Thanks for your quick respond. It clarified some of the confusion I have
with the hosted-engine.
However, I still have one question. Sorry. It is my bad that I did not
explain clearer on our hardware configuration, mainly on the SAN. We also
have 2 SAN, one on D1 & another one on X1. The blades on D1 can only see
the storage in SAN D1. X1 blades can only see SAN X1.
Does it mean that we will need to manage our oVirt environment separately
when we switch to use hosted-engine? Because from your explanation, the
hosted-engine in selected nodes will use separate iSCSI hosted-engine
storage to store the DB.
With hosted engine not only the DB but all the engine VM is going to be stored on a
dedicated iSCSI LUN so each host involved (not managed by) in hosted-engine should be able
to access that device in order to be able to start the engine VM after other host
failures.
So, if you want to have it restarting the engine VM on a X1 host after a complete failure
of D1 rack, you need to store the engine VM on a location that is accessible both by D1
and X1.
NFS could be an option too.
Otherwise you should check your storage path design in order to have a cross rack path;
you could also evaluate iSCSI multipathing.
Since there is no cross D1 & X1 storage in our
current config, that means we need separate hosted-engine setup on each
side.
Thanks,
Eric
-----Original Message-----
From: Simone Tiraboschi [mailto:stirabos@redhat.com]
Sent: Friday, March 20, 2015 7:06 PM
To: Eric Wong
Cc: users(a)ovirt.org
Subject: Re: [ovirt-users] Hosted Engine config in our hardware environment
----- Original Message -----
> From: "Eric Wong" <Eric.Wong(a)solvians.com>
> To: users(a)ovirt.org
> Sent: Thursday, March 19, 2015 7:04:04 PM
> Subject: [ovirt-users] Hosted Engine config in our hardware environment
>
> Hello oVirt guru out there:
>
> I want to seek some advice on upgrade path for our oVirt management vm
> configuration. We have been using oVirt for over 3 years. When we first
> setup oVirt environment, Hosted Engine componment did not exist. Our
> question is should we migrate our current configuration to use Hosted
> Engine?
>
> First let me give an overview of our configuration. We have blade servers
> in
> 2 separate racks. D1 & X1. Each side has 10 blades. Storage is iSCSI SAN.
>
> Inside our oVirt 3.5.0.1-1.el6 installation, it is configured with 2 data
> centers. D1 & X1. Each datacenter has the 10 blades for that side. The
> management function of oVirt (oVirt web console) is running off 2 VMs,
> ovirt-mgmt-1 on D1, and ovirt-mgmt-2 on X1. We have keepalived to maintain
> a
> flowing IP for the oVirt management console. The keepalived script makes
> sure only one copy of ovirt-engine is running at any time. It can be on D1
> or X1. The mgmt VMs have Postgresql setup in replication mode. In case one
> of the mgmt vm failed, the other mgmt vm on the other rack can pick up the
> mgmt role. Both mgmt VMs can see all blades and SAN resources on D1 & X1.
>
> This configuration has been working well for us. The drawback is if both
> ovirt mgmt vm crashed, we will not be able to start them or make any change
> to the ovirt environment. It is because the mgmt VMs are running within the
> oVirt domain.
>
> We tried to upgrade our configuration to Hosted Engine configuration. From
> what I understand, the Hosted Engine will run in a separate storage domain.
> In both times we tried to upgrade to Hosted Engine, they both failed during
> export and import of current configuration.
Here you can find some hint about how to migrate to hosted-engine:
http://www.ovirt.org/Migrate_to_Hosted_Engine
> I think my questions are:
> - will the Hosted Engine model works in our hardware configuration. With
> hardware in 2 racks, D1 & X1. Can a single Hosted Engine manage hardware on
> both sides?
> - How can we achieve redundancy when running Hosted Engine? We need to have
> management capibility in case one side completely failed.
>
> Thanks in advance.
> Eric
>
> _______________________________________________
> Users mailing list
> Users(a)ovirt.org
> http://lists.ovirt.org/mailman/listinfo/users
>
7:21 a.m.
----- Original Message -----
From: "Eric Wong" <Eric.Wong(a)solvians.com>
To: "Simone Tiraboschi" <stirabos(a)redhat.com>
Cc: users(a)ovirt.org
Sent: Wednesday, March 25, 2015 1:12:47 PM
Subject: Re: [ovirt-users] Hosted Engine config in our hardware environment
Simone:
I discussed with our SAN guy. We currently is not able to configure the SAN
in D1 & X1 to be seen by blades in both sides. So we are pretty much stuck
with our current ovirt mgmt. vms configuration.
I guess the main concern is how to control all the virtual machines with
oVirt infrastructure if both our ovirt-mgmt vms went down, how can we start
them up again. That also applies to any virtual machines. If the oVirt
mgmt infrastructure is not able, I think there is no way to start a VM,
correct?
Not really - ovirt-hosted-engine-ha does that :-)
In principle you can check how it does that and do so too.
IIRC we have an RFE to make it support more VMs (in addition to the
engine's one). IIUC this will not help you directly, because HA still
relies on shared storage.
Best,
--
Didi
7:35 a.m.
----- Original Message -----
From: "Eric Wong" <Eric.Wong(a)solvians.com>
To: "Simone Tiraboschi" <stirabos(a)redhat.com>
Cc: users(a)ovirt.org
Sent: Wednesday, March 25, 2015 12:12:47 PM
Subject: RE: [ovirt-users] Hosted Engine config in our hardware environment
Simone:
I discussed with our SAN guy. We currently is not able to configure the SAN
in D1 & X1 to be seen by blades in both sides. So we are pretty much stuck
with our current ovirt mgmt. vms configuration.
That is not an hosted engine issue, it's a design issue.
If you want to provide HA or disaster recovery capabilities between your two racks both of
them should be able to access your shared storage otherwise you simply cannot directly
migrate a VM from D1 to X1 or viceversa.
If you have two racks with two different and insulated SAN and they cannot access each
other you have two distinct insulated systems and you could only manage them as that; you
could use a single oVirt engine for that but the engine VM itself could not migrate to the
other system by design.
I guess the main concern is how to control all the virtual machines
with
oVirt infrastructure if both our ovirt-mgmt vms went down, how can we start
them up again. That also applies to any virtual machines. If the oVirt
mgmt infrastructure is not able, I think there is no way to start a VM,
correct?
At low level you could directly use virsh directly on the host to start a VM directly over
libvirtd but it's really a extreme solution.
Again, Many Thanks,
Eric
-----Original Message-----
From: Simone Tiraboschi [mailto:stirabos@redhat.com]
Sent: Tuesday, March 24, 2015 5:11 PM
To: Eric Wong
Cc: users(a)ovirt.org
Subject: Re: [ovirt-users] Hosted Engine config in our hardware environment
----- Original Message -----
> From: "Eric Wong" <Eric.Wong(a)solvians.com>
> To: "Simone Tiraboschi" <stirabos(a)redhat.com>
> Cc: users(a)ovirt.org
> Sent: Tuesday, March 24, 2015 9:36:11 AM
> Subject: RE: [ovirt-users] Hosted Engine config in our hardware environment
>
> Simone:
>
> Thanks for your quick respond. It clarified some of the confusion I have
> with the hosted-engine.
>
> However, I still have one question. Sorry. It is my bad that I did not
> explain clearer on our hardware configuration, mainly on the SAN. We also
> have 2 SAN, one on D1 & another one on X1. The blades on D1 can only see
> the storage in SAN D1. X1 blades can only see SAN X1.
>
> Does it mean that we will need to manage our oVirt environment separately
> when we switch to use hosted-engine? Because from your explanation, the
> hosted-engine in selected nodes will use separate iSCSI hosted-engine
> storage to store the DB.
With hosted engine not only the DB but all the engine VM is going to be
stored on a dedicated iSCSI LUN so each host involved (not managed by) in
hosted-engine should be able to access that device in order to be able to
start the engine VM after other host failures.
So, if you want to have it restarting the engine VM on a X1 host after a
complete failure of D1 rack, you need to store the engine VM on a location
that is accessible both by D1 and X1.
NFS could be an option too.
Otherwise you should check your storage path design in order to have a cross
rack path; you could also evaluate iSCSI multipathing.
> Since there is no cross D1 & X1 storage in our
> current config, that means we need separate hosted-engine setup on each
> side.
>
> Thanks,
> Eric
>
>
> -----Original Message-----
> From: Simone Tiraboschi [mailto:stirabos@redhat.com]
> Sent: Friday, March 20, 2015 7:06 PM
> To: Eric Wong
> Cc: users(a)ovirt.org
> Subject: Re: [ovirt-users] Hosted Engine config in our hardware environment
>
>
>
> ----- Original Message -----
> > From: "Eric Wong" <Eric.Wong(a)solvians.com>
> > To: users(a)ovirt.org
> > Sent: Thursday, March 19, 2015 7:04:04 PM
> > Subject: [ovirt-users] Hosted Engine config in our hardware environment
> >
> > Hello oVirt guru out there:
> >
> > I want to seek some advice on upgrade path for our oVirt management vm
> > configuration. We have been using oVirt for over 3 years. When we first
> > setup oVirt environment, Hosted Engine componment did not exist. Our
> > question is should we migrate our current configuration to use Hosted
> > Engine?
> >
> > First let me give an overview of our configuration. We have blade servers
> > in
> > 2 separate racks. D1 & X1. Each side has 10 blades. Storage is iSCSI SAN.
> >
> > Inside our oVirt 3.5.0.1-1.el6 installation, it is configured with 2 data
> > centers. D1 & X1. Each datacenter has the 10 blades for that side. The
> > management function of oVirt (oVirt web console) is running off 2 VMs,
> > ovirt-mgmt-1 on D1, and ovirt-mgmt-2 on X1. We have keepalived to
> > maintain
> > a
> > flowing IP for the oVirt management console. The keepalived script makes
> > sure only one copy of ovirt-engine is running at any time. It can be on
> > D1
> > or X1. The mgmt VMs have Postgresql setup in replication mode. In case
> > one
> > of the mgmt vm failed, the other mgmt vm on the other rack can pick up
> > the
> > mgmt role. Both mgmt VMs can see all blades and SAN resources on D1 & X1.
> >
> > This configuration has been working well for us. The drawback is if both
> > ovirt mgmt vm crashed, we will not be able to start them or make any
> > change
> > to the ovirt environment. It is because the mgmt VMs are running within
> > the
> > oVirt domain.
> >
> > We tried to upgrade our configuration to Hosted Engine configuration.
> > From
> > what I understand, the Hosted Engine will run in a separate storage
> > domain.
> > In both times we tried to upgrade to Hosted Engine, they both failed
> > during
> > export and import of current configuration.
>
> Here you can find some hint about how to migrate to hosted-engine:
> http://www.ovirt.org/Migrate_to_Hosted_Engine
>
> > I think my questions are:
> > - will the Hosted Engine model works in our hardware configuration. With
> > hardware in 2 racks, D1 & X1. Can a single Hosted Engine manage hardware
> > on
> > both sides?
> > - How can we achieve redundancy when running Hosted Engine? We need to
> > have
> > management capibility in case one side completely failed.
> >
> > Thanks in advance.
> > Eric
> >
> > _______________________________________________
> > Users mailing list
> > Users(a)ovirt.org
> > http://lists.ovirt.org/mailman/listinfo/users
> >
>
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participants (3)
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Eric Wong -
Simone Tiraboschi -
Yedidyah Bar David