Xen users - Apr 2011 - Probably very very stupid question regarding passthrough....

Hi,
I''m new of Xen and I have a probably very little and stupid question,
but i have decided to ask here to remove my dubt....

Scenario:

- 1 Server with xen and one FC HBA

- 1 Server with Openfiler and one FC HBA, with scst_tgt enable.

Now, I want get available scsi lun into more that one fully virtualized 
DomU''s

Way for it are passthrough, if I have understand.

My little question are if same phisic FC HBA can are used by multiple
DomU without problem or if one phisic hba must used by only one DomU

Question are, in this case, for fc hba.
But i think that this question are valid for anothers devices-

Many thanks,

Enrico


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Enrico Valsecchi wrote:
>Scenario:
>
>- 1 Server with xen and one FC HBA
>
>- 1 Server with Openfiler and one FC HBA, with scst_tgt enable.
>
>Now, I want get available scsi lun into more that one fully virtualized
DomU''s
>
>Way for it are passthrough, if I have understand.
>
>My little question are if same phisic FC HBA can are used by multiple
>DomU without problem or if one phisic hba must used by only one DomU
A device can only be passed through to one DomU. You probably need to 
access the SCSI LUN(s) in Dom0 and present them as block device to 
the DomUs

-- 
Simon Hobson

Visit http://www.magpiesnestpublishing.co.uk/ for books by acclaimed
author Gladys Hobson. Novels - poetry - short stories - ideal as
Christmas stocking fillers. Some available as e-books.

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Hi,

"Enrico Valsecchi" <admin@hostyle.it> írta 2011-04-09
16:02-kor:
> I''m new of Xen and I have a probably very little and stupid
question,
> but i have decided to ask here to remove my dubt....
Maybe, I misunderstood your question, but maybe not...
In that second case You are searching this:
http://wiki.xensource.com/xenwiki/XenNPIV

Cheers,
Gyu

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On Sat, 2011-04-09 at 19:22 +0100, Simon Hobson wrote:
> Enrico Valsecchi wrote:
> 
> >Scenario:
> >
> >- 1 Server with xen and one FC HBA
> >
> >- 1 Server with Openfiler and one FC HBA, with scst_tgt enable.
> >
> >Now, I want get available scsi lun into more that one fully virtualized
DomU''s
> >
> >Way for it are passthrough, if I have understand.
> >
> >My little question are if same phisic FC HBA can are used by multiple
> >DomU without problem or if one phisic hba must used by only one DomU
> 
> A device can only be passed through to one DomU. You probably need to 
> access the SCSI LUN(s) in Dom0 and present them as block device to 
> the DomUs
> 
Xen also supports NPIV.  Assuming your SAN and FC switches are NPIV
enabled, this is a good way to get multiple domUs access to the FC HBA.

-Nick



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Gyu,
many thanks for answer!

Yes, xenNPIV are solution of my problem.
Now, I have read and search with google additional
info, but I don''t have found documentation that 
explain how I can implement it on my systems...

:-(

I have install and configured my computer with
a Debian Squeeze with Xen 4.0.1, but into xm command
I don''t have any info in order how I can configure
npiv.

How I can find a tutorial or howto?

Many thanks,

Enrico
> Hi,
> 
> "Enrico Valsecchi" <admin@hostyle.it> írta 2011-04-09
16:02-kor:
>> I''m new of Xen and I have a probably very little and stupid
question,
>> but i have decided to ask here to remove my dubt....
> 
> Maybe, I misunderstood your question, but maybe not...
> In that second case You are searching this:
> http://wiki.xensource.com/xenwiki/XenNPIV
> 
> Cheers,
> Gyu
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On Sun, 2011-04-10 at 19:46 +0200, Enrico Valsecchi
wrote:
> Gyu,
> many thanks for answer!
> 
> Yes, xenNPIV are solution of my problem.
> Now, I have read and search with google additional
> info, but I don''t have found documentation that 
> explain how I can implement it on my systems...
> 
> :-(
> 
> I have install and configured my computer with
> a Debian Squeeze with Xen 4.0.1, but into xm command
> I don''t have any info in order how I can configure
> npiv.
> 
> How I can find a tutorial or howto?
> 
> Many thanks,
> 
> Enrico
> 
I find Novell''s page to be the most straight-forward on getting it
running:

http://www.novell.com/communities/node/6170/configuring-san-and-creating-vms-connected-san-using-fabric-channel-npiv-sles10-sp2

I do use SLES, but you should be able to apply the same logic to any
Linux-based dom0 that supports NPIV.

Also, note, as I mentioned in my reply with NPIV, your FC switches must
have NPIV support enabled (my Cisco MDS switches required issuing a
command to enable NPIV), and, if your SAN is a multi-head (Active/Active
or Active/Standby) controller configuration, you need to make sure that
it supports migrating the target WWNs between controllers, else you''ll
lose connectivity to your volumes when one of your controllers goes
down.

-Nick



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