Re: New User Linux on z10 question

2011-04-07 Thread Carsten Otte
> While 12 LPARs can share one IFL they cannot share any memory. Each LPAR
must have its own dedicated memory. That's the main reason to run z/VM, to
share memory. When
> I asked why Xen did not support System z, I was told that they didn't see
any point in competing with z/VM.

Xen is architecture dependend code all the way through. I know it also runs
on Power, but the only commonality
between Power and x86 is probably the printk routine...

with kind regards
Carsten Otte
IBM Linux Technology Center / Boeblingen lab
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Re: New User Linux on z10 question

2011-04-07 Thread David Boyes
> How do you spell "Least expensive path"?

People: (N * (salary + 33% avg benefits, repeating for the life of the job)) 
increasing over the increase in workload on top of hardware costs.
 
ZVM: (proportional to workload increase), can be planned in advance with 
justification, relatively static personnel costs. 

Do the math. z/VM almost always comes out cheaper. 

-- db
 

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Re: New User Linux on z10 question

2011-04-07 Thread Hughes, Jim
How do you spell "Least expensive path"?


Jim Hughes
Consulting Systems Programmer 
Mainframe Technical Support Group
Department of Information Technology
State of New Hampshire
27 Hazen Drive
Concord, NH 03301
603-271-5586Fax 603.271.1516

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-Original Message-
From: Linux on 390 Port [mailto:LINUX-390@VM.MARIST.EDU] On Behalf Of
David Boyes
Sent: Thursday, April 07, 2011 9:13 AM
To: LINUX-390@VM.MARIST.EDU
Subject: Re: New User Linux on z10 question

> Yes you can have 12 LPARs sharing a single IFL.  Whether it works very
> well
> is an "It Depends".

Well put. I'd pose it as: 

With VM: can be handled by part of one person, part time dynamically
with rare purchases of real resources. Changes are seldom disruptive.
 
Without VM: requires intervention of software *and* hardware team and
purchase of real resources for every increase in workload. 

Which do they want to do? 


Somehow they always pick "with VM". 8-)

-- db

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Re: New User Linux on z10 question

2011-04-07 Thread David Boyes
> Yes you can have 12 LPARs sharing a single IFL.  Whether it works very
> well
> is an "It Depends".

Well put. I'd pose it as: 

With VM: can be handled by part of one person, part time dynamically with rare 
purchases of real resources. Changes are seldom disruptive.
 
Without VM: requires intervention of software *and* hardware team and purchase 
of real resources for every increase in workload. 

Which do they want to do? 


Somehow they always pick "with VM". 8-)

-- db

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Re: New User Linux on z10 question

2011-04-06 Thread Rob van der Heij
On Wed, Apr 6, 2011 at 8:14 PM, David Stuart  wrote:
> Another point about PR/SM:
>
> The more LPARs you have, the higher the PR/SM 'overhead'.  Which will affect 
> all your LPARs, not just the Linux ones.

Not as if I were fighting on the wrong side of this, but I would
expect that most of the PR/SM overhead comes out of you own pocket (ie
gets dispatched on IFL again).  But then, who cares about overhead
when you can't measure usage anyway :-)

Rob

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Re: New User Linux on z10 question

2011-04-06 Thread David Stuart
Another point about PR/SM:  

The more LPARs you have, the higher the PR/SM 'overhead'.  Which will affect 
all your LPARs, not just the Linux ones.  


Dave 






Dave Stuart
Prin. Info. Systems Support Analyst
County of Ventura, CA
805-662-6731
david.stu...@ventura.org>>> "Rob van der Heij"  4/6/2011 
11:02 AM >>>
2011/4/6 Przemyslaw Kupisz :
> Limit for z10 is 60 LPARs, so why just only 12 Linux images on 1 IFL?
> IMHO you can run 60 Linux images on 1 IFL.

This kind things happens when they deliver glossy brochures to people
living under a rock...:-)

For z/OS a popular LPAR configuration rule seems to be that you don't
want to assign logical CPUs and weight such that the LPAR has less
than 10% of the CPU. Maybe they transposed that rule freely. Or maybe
the customer had 5 IFLs and someone concluded that you thus can run 12
images per IFL.

One of the interesting side-effects of the 60 LPAR thing that I see is
peole running z/OS test systems on z/VM. They started to create more
z/OS images because they could, and found out it is almost impossible
to manage with the restrictions that PR/SM has. So once they were
spoiled by having many z/OS images, they were ready to go beyond that
point and take advantage of z/VM.

Rob

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Re: New User Linux on z10 question

2011-04-06 Thread Rob van der Heij
2011/4/6 Przemyslaw Kupisz :
> Limit for z10 is 60 LPARs, so why just only 12 Linux images on 1 IFL?
> IMHO you can run 60 Linux images on 1 IFL.

This kind things happens when they deliver glossy brochures to people
living under a rock...:-)

For z/OS a popular LPAR configuration rule seems to be that you don't
want to assign logical CPUs and weight such that the LPAR has less
than 10% of the CPU. Maybe they transposed that rule freely. Or maybe
the customer had 5 IFLs and someone concluded that you thus can run 12
images per IFL.

One of the interesting side-effects of the 60 LPAR thing that I see is
peole running z/OS test systems on z/VM. They started to create more
z/OS images because they could, and found out it is almost impossible
to manage with the restrictions that PR/SM has. So once they were
spoiled by having many z/OS images, they were ready to go beyond that
point and take advantage of z/VM.

Rob

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Re: New User Linux on z10 question

2011-04-06 Thread Przemyslaw Kupisz
Limit for z10 is 60 LPARs, so why just only 12 Linux images on 1 IFL?
IMHO you can run 60 Linux images on 1 IFL.

--
Przemyslaw Kupisz
http://www.linkedin.com/in/pkupisz

W dniu 06.04.2011 17:44, Alan Ackerman pisze:
> While 12 LPARs can share one IFL they cannot share any memory. Each LPAR must 
> have its own dedicated memory. That's the main reason to run z/VM, to share 
> memory. When I asked why Xen did not support System z, I was told that they 
> didn't see any point in competing with z/VM.
>
> Sent from my iPod
>
> On Apr 6, 2011, at 15:57, Carsten Otte  wrote:
>
>>> Someone told me it is possible to run 12 Linux images on a single IFL
>>> without the use of z/VM.
>>
>>> Is this true and how?
>>
>> One thing you could do is define 12 logical partitions (LPAR). You can
>> define them IFL only, with shared
>> engines. Not that I'm advising to do so
>>
>> with kind regards
>> Carsten Otte
>> IBM Linux Technology Center / Boeblingen lab
>> --
>> omnis enim res, quae dando non deficit, dum habetur et non datur, nondum
>> habetur, quomodo habenda est
>>
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>
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Re: New User Linux on z10 question

2011-04-06 Thread Pat Carroll
My guess is that management does not understand that. 


Patrick Carroll  |  Technology Architect II 
L.L.Bean, Inc.(r) |  Double L St. |  Freeport ME 04033 
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-Original Message-
From: Linux on 390 Port [mailto:LINUX-390@VM.MARIST.EDU] On Behalf Of Mark Post
Sent: Wednesday, April 06, 2011 10:22 AM
To: LINUX-390@VM.MARIST.EDU
Subject: Re: New User Linux on z10 question

>>> On 4/6/2011 at 10:03 AM, Scott Rohling  wrote: 
> oops - forgot about Xen.. which I believe can also virtualize?  I know 
> very little about it on z... so should probably not have said 'the 
> only way'  ;-)

Xen won't even compile on System z, let alone run.  KVM is the other option for 
System z.


Mark Post

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Re: New User Linux on z10 question

2011-04-06 Thread Alan Ackerman
While 12 LPARs can share one IFL they cannot share any memory. Each LPAR must 
have its own dedicated memory. That's the main reason to run z/VM, to share 
memory. When I asked why Xen did not support System z, I was told that they 
didn't see any point in competing with z/VM.

Sent from my iPod

On Apr 6, 2011, at 15:57, Carsten Otte  wrote:

>> Someone told me it is possible to run 12 Linux images on a single IFL
>> without the use of z/VM.
> 
>> Is this true and how?
> 
> One thing you could do is define 12 logical partitions (LPAR). You can
> define them IFL only, with shared
> engines. Not that I'm advising to do so
> 
> with kind regards
> Carsten Otte
> IBM Linux Technology Center / Boeblingen lab
> --
> omnis enim res, quae dando non deficit, dum habetur et non datur, nondum
> habetur, quomodo habenda est
> 
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Re: New User Linux on z10 question

2011-04-06 Thread Carsten Otte
> Someone told me it is possible to run 12 Linux images on a single IFL
> without the use of z/VM.

> Is this true and how?

One thing you could do is define 12 logical partitions (LPAR). You can
define them IFL only, with shared
engines. Not that I'm advising to do so

with kind regards
Carsten Otte
IBM Linux Technology Center / Boeblingen lab
--
omnis enim res, quae dando non deficit, dum habetur et non datur, nondum
habetur, quomodo habenda est

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Re: New User Linux on z10 question

2011-04-06 Thread Mark Post
>>> On 4/6/2011 at 09:44 AM, Billy Bingham  
>>> wrote:

> You may be able to run 12 LPARs on a single IFL,
> but you can only run one instance of an OS on a
> LPAR without VM.

Well, there is KVM.  Carsten Otte has spent a lot of time making that work on 
System z.  I don't know that anyone supports that for production use.


Mark Post

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Re: New User Linux on z10 question

2011-04-06 Thread Mark Post
>>> On 4/6/2011 at 10:13 AM, Alan Altmark  wrote: 
> Maybe KVM can run 12 images on an IFL *doing something useful* and
> maybe it can't.  Dunno...

I have no doubt that it can, but since it's not supported, even by IBM, I 
wouldn't want to do it.


Mark Post

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Re: New User Linux on z10 question

2011-04-06 Thread Pat Carroll
I love it when management gets involved in technical architecture.
It may work if you share the IFL amongst 12 LPARs. How well it will work 
depends on the workload. 
Maybe they're talking about Zen? 


Patrick Carroll  |  Technology Architect II 
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-Original Message-
From: Linux on 390 Port [mailto:LINUX-390@VM.MARIST.EDU] On Behalf Of Hughes, 
Jim
Sent: Wednesday, April 06, 2011 9:39 AM
To: LINUX-390@VM.MARIST.EDU
Subject: New User Linux on z10 question

Someone told me it is possible to run 12 Linux images on a single IFL without 
the use of z/VM.

Is this true and how?

The management around here heard this statement a while back and are now on a 
quest for us to create an LPAR for the IFL to run multiple Linux images on it.  
I must have missed the memo and I am looking for what I may have missed.

Thanks in advance.


Jim Hughes
Consulting Systems Programmer
Mainframe Technical Support Group
Department of Information Technology
State of New Hampshire
27 Hazen Drive
Concord, NH 03301
603-271-5586Fax 603.271.1516

Statement of Confidentiality: The contents of this message are confidential. 
Any unauthorized disclosure, reproduction, use or dissemination (either whole 
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system.

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Re: New User Linux on z10 question

2011-04-06 Thread Mark Post
>>> On 4/6/2011 at 10:03 AM, Scott Rohling  wrote: 
> oops - forgot about Xen.. which I believe can also virtualize?  I know very
> little about it on z... so should probably not have said 'the only way'  ;-)

Xen won't even compile on System z, let alone run.  KVM is the other option for 
System z.


Mark Post

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Re: New User Linux on z10 question

2011-04-06 Thread Mark Pace
On Wed, Apr 6, 2011 at 9:39 AM, Hughes, Jim  wrote:

> Someone told me it is possible to run 12 Linux images on a single IFL
> without the use of z/VM.
>
> Is this true and how?
>

Yes you can have 12 LPARs sharing a single IFL.  Whether it works very well
is an "It Depends".

>
> The management around here heard this statement a while back and are now
> on a quest for us to create an LPAR for the IFL to run multiple Linux
> images on it.  I must have missed the memo and I am looking for what I
> may have missed.
>
No you can not run multple Linux guests in a single LPAR without z/VM.

>
> Thanks in advance.
>
> 
> Jim Hughes
> Consulting Systems Programmer
> Mainframe Technical Support Group
> Department of Information Technology
> State of New Hampshire
> 27 Hazen Drive
> Concord, NH 03301
> 603-271-5586Fax 603.271.1516
>
> Statement of Confidentiality: The contents of this message are
> confidential. Any unauthorized disclosure, reproduction, use or
> dissemination (either whole or in part) is prohibited. If you are not
> the intended recipient of this message, please notify the sender
> immediately and delete the message from your system.
>
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Re: New User Linux on z10 question

2011-04-06 Thread Alan Altmark
On Wednesday, 04/06/2011 at 09:41 EDT, "Hughes, Jim"
 wrote:
> Someone told me it is possible to run 12 Linux images on a single IFL
> without the use of z/VM.
>
> Is this true and how?
>
> The management around here heard this statement a while back and are now
> on a quest for us to create an LPAR for the IFL to run multiple Linux
> images on it.  I must have missed the memo and I am looking for what I
> may have missed.

It may be a reference to KVM, the "virtual machine" technology built into
Linux.  Maybe KVM can run 12 images on an IFL *doing something useful* and
maybe it can't.  Dunno...

Alan Altmark

z/VM and Linux on System z Consultant
IBM System Lab Services and Training
ibm.com/systems/services/labservices
office: 607.429.3323
mobile; 607.321.7556
alan_altm...@us.ibm.com
IBM Endicott

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Re: New User Linux on z10 question

2011-04-06 Thread Marcy Cortes
Nobody eats just one.

Find another one.  Run VM.  :)

Marcy 
-Original Message-
From: Linux on 390 Port [mailto:LINUX-390@vm.marist.edu] On Behalf Of Scott 
Rohling
Sent: Wednesday, April 06, 2011 6:58 AM
To: LINUX-390@vm.marist.edu
Subject: Re: [LINUX-390] New User Linux on z10 question

Multiple LPARs can share an IFL...  but the only way to run multiple Linux
instances in a single LPAR is using z/VM to virtualize it.

If you're really talking about one lonely IFL -  you'll likely want to
dedicate it and let z/VM manage the sharing on a single LPAR.

Scott Rohling

On Wed, Apr 6, 2011 at 7:39 AM, Hughes, Jim  wrote:

> Someone told me it is possible to run 12 Linux images on a single IFL
> without the use of z/VM.
>
> Is this true and how?
>
> The management around here heard this statement a while back and are now
> on a quest for us to create an LPAR for the IFL to run multiple Linux
> images on it.  I must have missed the memo and I am looking for what I
> may have missed.
>
> Thanks in advance.
>
> 
> Jim Hughes
> Consulting Systems Programmer
> Mainframe Technical Support Group
> Department of Information Technology
> State of New Hampshire
> 27 Hazen Drive
> Concord, NH 03301
> 603-271-5586Fax 603.271.1516
>
> Statement of Confidentiality: The contents of this message are
> confidential. Any unauthorized disclosure, reproduction, use or
> dissemination (either whole or in part) is prohibited. If you are not
> the intended recipient of this message, please notify the sender
> immediately and delete the message from your system.
>
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> http://wiki.linuxvm.org/
>

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Re: New User Linux on z10 question

2011-04-06 Thread Scott Rohling
oops - forgot about Xen.. which I believe can also virtualize?  I know very
little about it on z... so should probably not have said 'the only way'  ;-)

Scott Rohling

On Wed, Apr 6, 2011 at 7:58 AM, Scott Rohling wrote:

> Multiple LPARs can share an IFL...  but the only way to run multiple Linux
> instances in a single LPAR is using z/VM to virtualize it.
>
> If you're really talking about one lonely IFL -  you'll likely want to
> dedicate it and let z/VM manage the sharing on a single LPAR.
>
> Scott Rohling
>
>
> On Wed, Apr 6, 2011 at 7:39 AM, Hughes, Jim wrote:
>
>> Someone told me it is possible to run 12 Linux images on a single IFL
>> without the use of z/VM.
>>
>> Is this true and how?
>>
>> The management around here heard this statement a while back and are now
>> on a quest for us to create an LPAR for the IFL to run multiple Linux
>> images on it.  I must have missed the memo and I am looking for what I
>> may have missed.
>>
>> Thanks in advance.
>>
>> 
>> Jim Hughes
>> Consulting Systems Programmer
>> Mainframe Technical Support Group
>> Department of Information Technology
>> State of New Hampshire
>> 27 Hazen Drive
>> Concord, NH 03301
>> 603-271-5586Fax 603.271.1516
>>
>> Statement of Confidentiality: The contents of this message are
>> confidential. Any unauthorized disclosure, reproduction, use or
>> dissemination (either whole or in part) is prohibited. If you are not
>> the intended recipient of this message, please notify the sender
>> immediately and delete the message from your system.
>>
>> --
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>> send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or
>> visit
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>> http://wiki.linuxvm.org/
>>
>
>

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Re: New User Linux on z10 question

2011-04-06 Thread Scott Rohling
Multiple LPARs can share an IFL...  but the only way to run multiple Linux
instances in a single LPAR is using z/VM to virtualize it.

If you're really talking about one lonely IFL -  you'll likely want to
dedicate it and let z/VM manage the sharing on a single LPAR.

Scott Rohling

On Wed, Apr 6, 2011 at 7:39 AM, Hughes, Jim  wrote:

> Someone told me it is possible to run 12 Linux images on a single IFL
> without the use of z/VM.
>
> Is this true and how?
>
> The management around here heard this statement a while back and are now
> on a quest for us to create an LPAR for the IFL to run multiple Linux
> images on it.  I must have missed the memo and I am looking for what I
> may have missed.
>
> Thanks in advance.
>
> 
> Jim Hughes
> Consulting Systems Programmer
> Mainframe Technical Support Group
> Department of Information Technology
> State of New Hampshire
> 27 Hazen Drive
> Concord, NH 03301
> 603-271-5586Fax 603.271.1516
>
> Statement of Confidentiality: The contents of this message are
> confidential. Any unauthorized disclosure, reproduction, use or
> dissemination (either whole or in part) is prohibited. If you are not
> the intended recipient of this message, please notify the sender
> immediately and delete the message from your system.
>
> --
> For LINUX-390 subscribe / signoff / archive access instructions,
> send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or
> visit
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> --
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> http://wiki.linuxvm.org/
>

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Re: New User Linux on z10 question

2011-04-06 Thread McKown, John
> -Original Message-
> From: Linux on 390 Port [mailto:LINUX-390@VM.MARIST.EDU] On 
> Behalf Of Hughes, Jim
> Sent: Wednesday, April 06, 2011 8:39 AM
> To: LINUX-390@VM.MARIST.EDU
> Subject: New User Linux on z10 question
> 
> Someone told me it is possible to run 12 Linux images on a single IFL
> without the use of z/VM.
> 
> Is this true and how?
> 
> The management around here heard this statement a while back 
> and are now
> on a quest for us to create an LPAR for the IFL to run multiple Linux
> images on it.  I must have missed the memo and I am looking for what I
> may have missed.
> 
> Thanks in advance.
> 
> 
> Jim Hughes

I thik you misunderstand. The 12 Linux images don't all run in a single LPAR. 
You make 12 LPARs. Share the one IFL between all 12 LPARs. I don't remember the 
upper limit for the number of LPARs on each different z. We run 3 z/OS systems 
on 2 CPs with no z/VM - by using LPARs. Nothing magic.

--
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Systems Engineer IV
IT

Administrative Services Group

HealthMarkets(r)

9151 Boulevard 26 * N. Richland Hills * TX 76010
(817) 255-3225 phone * 
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Re: New User Linux on z10 question

2011-04-06 Thread Billy Bingham
You may be able to run 12 LPARs on a single IFL,
but you can only run one instance of an OS on a
LPAR without VM.


Billy

On 6 Apr 2011 at 9:39, Hughes, Jim wrote:

> Someone told me it is possible to run 12 Linux images on a single IFL
> without the use of z/VM.
>
> Is this true and how?
>
> The management around here heard this statement a while back and are
> now on a quest for us to create an LPAR for the IFL to run multiple
> Linux images on it.  I must have missed the memo and I am looking for
> what I may have missed.
>
> Thanks in advance.
>
> 
> Jim Hughes
> Consulting Systems Programmer
> Mainframe Technical Support Group
> Department of Information Technology
> State of New Hampshire
> 27 Hazen Drive
> Concord, NH 03301
> 603-271-5586Fax 603.271.1516
>
> Statement of Confidentiality: The contents of this message are
> confidential. Any unauthorized disclosure, reproduction, use or
> dissemination (either whole or in part) is prohibited. If you are not
> the intended recipient of this message, please notify the sender
> immediately and delete the message from your system.
>
> --
> For LINUX-390 subscribe / signoff / archive access instructions, send
> email to lists...@vm.marist.edu with the message: INFO LINUX-390 or
> visit http://www.marist.edu/htbin/wlvindex?LINUX-390
> --
> For more information on Linux on System z, visit
> http://wiki.linuxvm.org/
>



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New User Linux on z10 question

2011-04-06 Thread Hughes, Jim
Someone told me it is possible to run 12 Linux images on a single IFL
without the use of z/VM.

Is this true and how?

The management around here heard this statement a while back and are now
on a quest for us to create an LPAR for the IFL to run multiple Linux
images on it.  I must have missed the memo and I am looking for what I
may have missed.

Thanks in advance.


Jim Hughes
Consulting Systems Programmer 
Mainframe Technical Support Group
Department of Information Technology
State of New Hampshire
27 Hazen Drive
Concord, NH 03301
603-271-5586Fax 603.271.1516

Statement of Confidentiality: The contents of this message are
confidential. Any unauthorized disclosure, reproduction, use or
dissemination (either whole or in part) is prohibited. If you are not
the intended recipient of this message, please notify the sender
immediately and delete the message from your system.

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