Re: [ldoms-discuss] Request help - Ldom with alternate IO domain

[email protected] Sat, 02 Apr 2011 02:11:59 -0700

On 02/04/2011 09:10, Tony Scully wrote:

Hi,

I think the T3-4 server has it's internal disks split across 2 controllers, so you can have dual i/o domains without having a external storage for the boot disks.

At least I hope so, we have some on order :)

Correct. It is the only one of the T3 based servers to have this feature.

T

Tony

On Fri, Apr 1, 2011 at 7:00 PM, Octave Orgeron <[email protected]> wrote:

That is correct. If you configure a secondary service domain and spread out your
I/O and multipathing for your guests between them, you can have redundancy for
control domain failures or maintenance. FYI, even if the control domain were to
go away, the guests will continue to run and will attempt to queue up I/O
requests so that they can be processed by the control domain when it comes back.

You are also correct that the secondary service domain should have either a
SCSI/SAS or FC HBA to connect to external storage as the T-series SAS controller
is only on one PCI-E switch and not partitionable.

*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*
Octave J. Orgeron
Solaris Virtualization Architect and Consultant
Web: http://unixconsole.blogspot.com
E-Mail: [email protected]
*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*

----- Original Message ----
From: Julien Gabel <[email protected]>
To: "[email protected]" <[email protected]>
Cc: [email protected]
Sent: Fri, April 1, 2011 11:56:58 AM
Subject: Re: [ldoms-discuss] Request help - Ldom with alternate IO domain

Hi,

>> Can a guest domain with storage and network available through alternate
>> IO domain also survive after control domain goes down?

> Yes, that is the reason for creating a second I/O domain. You do not provide
> details of your configuration, but typically when you create the alternate I/O
> domain it is created so that it does not share any resource from the primary.

Interesting. I though that the processor, memory, LDC and such other things
are only available through the control domain, and that this was a problem. So,
it seems that if you don't want or need to change domains configuration, this
special domain is "not needed" for other things that the I/O parts and can be
rebooted without impact on guest domains (properly configured with an alternate
I/O domain)?

It would be nice to have clear guidance for this kind of a little bit
complex LDom
configurations, particularly with the new T3 servers (as can be found
in the LDom
Community CookBook).

> So it would be created from its own PCI bus and have separate boot disks
> and network devices.

For the alternate I/O domain to be fully redundant, you mean the separate boot
disks not to be provided locally, but from SAN maybe? (I can't find a T-Series
where each of the two (or more) buses provide internal disk drives.)

--
julien.
http://blog.thilelli.net/
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Re: [ldoms-discuss] Request help - Ldom with alternate IO domain

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