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Virtual Server 2005

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Hyper-V Highly Available

Source: microsoft.public.virtualserver
Sent: 10/23/2008
From: John
Message:

Hi all,

If I have 12 VMs on two nodes Windows 2008 x64 Enterprise servers and I
configued it as A/A failover cluster, does that mean that I only need two
service and application group which each group hosts 6VMs (one 6VMs active on
node1 and another 6VMs active on node2 )

What if I go for A/A/A cluster with three nodes, does that mean I need three
service and application groups (which each group hosts 4VMs (one 4VMs active
on node1, one 4VMs on node2 and one 4 VMs on node3)? How do I configure
PREFERRED OWNERS between them? any suggestions?

Thank you!

Post Reply | This is Spam! | Mark as Spam

Related Messages

Re: Hyper-V Highly Available

Sent: 10/24/2008
From: Paul Weterings <Paul-nospam-@syncpuls-dot-com>
Message:

I'm actually in the process of writing an article on this, which will be
online in a few days.

The trick is to have your virtual machines on separate clustered disks,
when you add a new VM, the cluster service checks at what clustered disk
the virtual machine is hosted. It will create "Service and application
groups' based on what disks these Virtual Machines are found.

Example:

server1
server2

are on iSCSI Cluster Disk 1.

server9
server8

are on iSCSI Cluster disk 2

When creating/importing vm's into cluster manager, it will create two
groups, the first containing server1 and server2, the other containing
server9 and server8.

A mistake that would be easily made would be to expect each VM to be
assignable to a node. Since we are using shared storage, that is of
course not possible. Therefore the groups rather than the machines can
have node affinity.

If you have created separate groups as described above, you'll find that
in the properties of the -groups- it is possible to select a particular
node to be the 'preferred owner'. This way you can 'balance' the usage
of resources on you fail over cluster.

As said: I'll have a more in-depth & details article available soon on
my website. Until then, I hope this explanation answers your question!

/ ) Regards,
/ /_________
_|__|__) Paul Weterings
/ (O_) http://www.servercare.nl
__/ (O_)
____(O_)

John wrote:

Show quoted text

> Hi all,
>
> If I have 12 VMs on two nodes Windows 2008 x64 Enterprise servers and I
> configued it as A/A failover cluster, does that mean that I only need two
> service and application group which each group hosts 6VMs (one 6VMs active on
> node1 and another 6VMs active on node2 )
>
> What if I go for A/A/A cluster with three nodes, does that mean I need three
> service and application groups (which each group hosts 4VMs (one 4VMs active
> on node1, one 4VMs on node2 and one 4 VMs on node3)? How do I configure
> PREFERRED OWNERS between them? any suggestions?
>
> Thank you!
>
>
>
>
>

Re: Hyper-V Highly Available

Sent: 10/26/2008
From: Paul Weterings <Paul-nospam-@syncpuls-dot-com>
Message:

Article is up:
http://www.servercare.nl/Lists/Posts/Post.aspx?ID=72

/ ) Regards,
/ /_________
_|__|__) Paul Weterings
/ (O_) http://www.servercare.nl
__/ (O_)
____(O_)

Paul Weterings wrote:

Show quoted text

> I'm actually in the process of writing an article on this, which will be
> online in a few days.
>
> The trick is to have your virtual machines on separate clustered disks,
> when you add a new VM, the cluster service checks at what clustered disk
> the virtual machine is hosted. It will create "Service and application
> groups' based on what disks these Virtual Machines are found.
>
> Example:
>
> server1
> server2
>
> are on iSCSI Cluster Disk 1.
>
> server9
> server8
>
> are on iSCSI Cluster disk 2
>
> When creating/importing vm's into cluster manager, it will create two
> groups, the first containing server1 and server2, the other containing
> server9 and server8.
>
> A mistake that would be easily made would be to expect each VM to be
> assignable to a node. Since we are using shared storage, that is of
> course not possible. Therefore the groups rather than the machines can
> have node affinity.
>
> If you have created separate groups as described above, you'll find that
> in the properties of the -groups- it is possible to select a particular
> node to be the 'preferred owner'. This way you can 'balance' the usage
> of resources on you fail over cluster.
>
> As said: I'll have a more in-depth & details article available soon on
> my website. Until then, I hope this explanation answers your question!
>
>
> / ) Regards,
> / /_________
> _|__|__) Paul Weterings
> / (O_) http://www.servercare.nl
> __/ (O_)
> ____(O_)
>
>
> John wrote:
>> Hi all,
>>
>> If I have 12 VMs on two nodes Windows 2008 x64 Enterprise servers and
>> I configued it as A/A failover cluster, does that mean that I only
>> need two service and application group which each group hosts 6VMs
>> (one 6VMs active on node1 and another 6VMs active on node2 )
>>
>> What if I go for A/A/A cluster with three nodes, does that mean I need
>> three service and application groups (which each group hosts 4VMs (one
>> 4VMs active on node1, one 4VMs on node2 and one 4 VMs on node3)? How
>> do I configure PREFERRED OWNERS between them? any suggestions?
>>
>> Thank you!
>>
>>
>>
>>
>>

Re: Hyper-V Highly Available

Sent: 10/29/2008
From: John
Message:

Great help and thank you for your efforts to help others.

Quick quesions: The SAN should directly attached host if we do host
clustering?

Thank you.

"Paul Weterings" wrote:

Show quoted text

> Article is up:
> http://www.servercare.nl/Lists/Posts/Post.aspx?ID=72
>
>
> / ) Regards,
> / /_________
> _|__|__) Paul Weterings
> / (O_) http://www.servercare.nl
> __/ (O_)
> ____(O_)
>
>
> Paul Weterings wrote:
> > I'm actually in the process of writing an article on this, which will be
> > online in a few days.
> >
> > The trick is to have your virtual machines on separate clustered disks,
> > when you add a new VM, the cluster service checks at what clustered disk
> > the virtual machine is hosted. It will create "Service and application
> > groups' based on what disks these Virtual Machines are found.
> >
> > Example:
> >
> > server1
> > server2
> >
> > are on iSCSI Cluster Disk 1.
> >
> > server9
> > server8
> >
> > are on iSCSI Cluster disk 2
> >
> > When creating/importing vm's into cluster manager, it will create two
> > groups, the first containing server1 and server2, the other containing
> > server9 and server8.
> >
> > A mistake that would be easily made would be to expect each VM to be
> > assignable to a node. Since we are using shared storage, that is of
> > course not possible. Therefore the groups rather than the machines can
> > have node affinity.
> >
> > If you have created separate groups as described above, you'll find that
> > in the properties of the -groups- it is possible to select a particular
> > node to be the 'preferred owner'. This way you can 'balance' the usage
> > of resources on you fail over cluster.
> >
> > As said: I'll have a more in-depth & details article available soon on
> > my website. Until then, I hope this explanation answers your question!
> >
> >
> > / ) Regards,
> > / /_________
> > _|__|__) Paul Weterings
> > / (O_) http://www.servercare.nl
> > __/ (O_)
> > ____(O_)
> >
> >
> > John wrote:
> >> Hi all,
> >>
> >> If I have 12 VMs on two nodes Windows 2008 x64 Enterprise servers and
> >> I configued it as A/A failover cluster, does that mean that I only
> >> need two service and application group which each group hosts 6VMs
> >> (one 6VMs active on node1 and another 6VMs active on node2 )
> >>
> >> What if I go for A/A/A cluster with three nodes, does that mean I need
> >> three service and application groups (which each group hosts 4VMs (one
> >> 4VMs active on node1, one 4VMs on node2 and one 4 VMs on node3)? How
> >> do I configure PREFERRED OWNERS between them? any suggestions?
> >>
> >> Thank you!
> >>
> >>
> >>
> >>
> >>
>

Re: Hyper-V Highly Available

Sent: 10/30/2008
From: John
Message:

Paul,

Thank you for your expertise and efforts.

Sorry to bother you again with this question:

The general rule for Hyper-V VM highly available is per VM per LUN.

What about VM with lots of drive letters and should we assign more LUNs to
it?

Thank you for your time.

"Paul Weterings" wrote:

Show quoted text

> John wrote:
> > Great help and thank you for your efforts to help others.
> >
> > Quick quesions: The SAN should directly attached host if we do host
> > clustering?
> >
> > Thank you.
> >
>
>
> If I understand your question correct: yes. If you intend to cluster
> between the VM's the SAN should best be using directly attached to the
> VM's. Keep in mind that how you attach storage very much depends on the
> application you want highly available. (for example: don't run exchange
> 2007 on a Hyper-V cluster, but rather cluster two hyper-V VM's running
> Exchange as an Exchange CCR cluster..)
>
> I'm not sure what you will be running on the VM's, but just as some
> background information: MS has recently posted
> (http://download.microsoft.com/download/d/9/4/d948f981-926e-40fa-a026-5bfcf076d9b9/SQL2008inHyperV2008.docx)
> the results of tests where they reported results of fixed size VHD's to
> be quite similar to pass-through storage.
>
> If you're intending to do an Exchange 2007 deployment on Hyper-V and
> cluster it: pass-through storage is advised:
> http://technet.microsoft.com/en-us/library/cc794548.aspx
>
> That will be my next article b.t.w. ;-)
>
> regards,
>
> --
>
> / ) Regards,
> / /_________
> _|__|__) Paul Weterings
> / (O_) http://www.servercare.nl
> __/ (O_)
> ____(O_)
>

Re: Hyper-V Highly Available

Sent: 10/30/2008
From: Paul Weterings <Paul-nospam-@syncpuls-dot-com>
Message:

John wrote:

If I understand your question correct: yes. If you intend to cluster
between the VM's the SAN should best be using directly attached to the
VM's. Keep in mind that how you attach storage very much depends on the
application you want highly available. (for example: don't run exchange
2007 on a Hyper-V cluster, but rather cluster two hyper-V VM's running
Exchange as an Exchange CCR cluster..)

I'm not sure what you will be running on the VM's, but just as some
background information: MS has recently posted
(http://download.microsoft.com/download/d/9/4/d948f981-926e-40fa-a026-5bfcf076d9b9/SQL2008inHyperV2008.docx)
the results of tests where they reported results of fixed size VHD's to
be quite similar to pass-through storage.

If you're intending to do an Exchange 2007 deployment on Hyper-V and
cluster it: pass-through storage is advised:
http://technet.microsoft.com/en-us/library/cc794548.aspx

That will be my next article b.t.w. ;-)

regards,

--

/ ) Regards,
/ /_________
_|__|__) Paul Weterings
/ (O_) http://www.servercare.nl
__/ (O_)
____(O_)

Show quoted text

> Great help and thank you for your efforts to help others.
>
> Quick quesions: The SAN should directly attached host if we do host
> clustering?
>
> Thank you.
>

Re: Hyper-V Highly Available

Sent: 10/30/2008
From: Paul Weterings <Paul-nospam-@syncpuls-dot-com>
Message:

Quite frankly, I'm not sure...

As far as I know best practices dictate that you have multiple LUNs and
that each LUN only hosts one VM, I recall that this is also a
requirement of SCVMM.

Reasons are I believe mostly performance and for SAN transfers, I can't
really think of a reason to assign more LUNs just because a machine has
more drive letters.

/ ) Regards,
/ /_________
_|__|__) Paul Weterings
/ (O_) http://www.servercare.nl
__/ (O_)
____(O_)

John wrote:

Show quoted text

> Paul,
>
> Thank you for your expertise and efforts.
>
> Sorry to bother you again with this question:
>
> The general rule for Hyper-V VM highly available is per VM per LUN.
>
> What about VM with lots of drive letters and should we assign more LUNs to
> it?
>
> Thank you for your time.
>
>
>
>
> "Paul Weterings" wrote:
>
>> John wrote:
>>> Great help and thank you for your efforts to help others.
>>>
>>> Quick quesions: The SAN should directly attached host if we do host
>>> clustering?
>>>
>>> Thank you.
>>>
>>
>> If I understand your question correct: yes. If you intend to cluster
>> between the VM's the SAN should best be using directly attached to the
>> VM's. Keep in mind that how you attach storage very much depends on the
>> application you want highly available. (for example: don't run exchange
>> 2007 on a Hyper-V cluster, but rather cluster two hyper-V VM's running
>> Exchange as an Exchange CCR cluster..)
>>
>> I'm not sure what you will be running on the VM's, but just as some
>> background information: MS has recently posted
>> (http://download.microsoft.com/download/d/9/4/d948f981-926e-40fa-a026-5bfcf076d9b9/SQL2008inHyperV2008.docx)
>> the results of tests where they reported results of fixed size VHD's to
>> be quite similar to pass-through storage.
>>
>> If you're intending to do an Exchange 2007 deployment on Hyper-V and
>> cluster it: pass-through storage is advised:
>> http://technet.microsoft.com/en-us/library/cc794548.aspx
>>
>> That will be my next article b.t.w. ;-)
>>
>> regards,
>>
>> --
>>
>> / ) Regards,
>> / /_________
>> _|__|__) Paul Weterings
>> / (O_) http://www.servercare.nl
>> __/ (O_)
>> ____(O_)
>>

Post Reply | This is Spam! | Mark as Spam

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