If a z/VM guest partially or completely purges the TLB on a z10 or z196, is
the time required to quiesce CPs to coordinate the requested purge counted
toward total CPU time for the guest requesting the purge? If so does the
guest requesting the purge get tagged for all the CPU time required to
coor
There is only one place in z Architecture Principles of Operation where the
word substantially is used. Even more surprising than its use is the fact
that it appears immediately before the word "accurate". My interest in the
reference bit, though passing, is sincere since I would like to hang my h
al
> storage and DASD to support a few of those VMs, their paging and dump
> space requirements. :-)
>
> 11010100100010011001001011010100111001101001100100111010001111
> 0110011001
>
> Mike Walter
> Hewitt Associates
> The opinions expressed herein ar
What is the maximum guest virtual storage supported by z/VM?
--. .- .-. -.--
Gary Dennis
Mantissa Corporation
S if you had guests averaging 18GB each, and you follow
recommendations for page volume utilization (50% as I understand it), Mod 9s
would yield around 4GB useable page space each.
That would give you 100 such images per VM .. (250 volumes times the
4GB/volume divided by 18GB per image
Less than an hour before reading this thread I had IPLed two x86 operating
systems under z/VM 5.3. One is a tiny OS used as a checkpoint after major
changes to the x86 virtualization layer. It's just a way to make sure the
puzzle is still assembled more or less correctly. The other OS is DSL. Th
We are developing on a second level VM system with access through VPN.
Regardless of the VPN client location (Home, office ), ISP download/upload
speed and chip speed of the client machine, we can¹t seem to get any more
than 135K bytes per second over the VPN.
This number holds true for both FTP
The POPS For System z contains the following note:
"
Programming Note: For fixed-field-length operations with field lengths that
are a power of 2, significant performance degradation is possible when
storage operands are not positioned at addresses that are integral multiples
of the operand length
In the movie "In Search of the Holy Grail", the knights who say "nee" could
not bear to hear a certain words. One of those words was "it".
"It" appears that best practice may be not to ask about -
(words redacted).
Thanks to all who responded.
--. .- .-. -.--
Gary Dennis
Mantiss
Watching ³A Christmas Story² makes me wonder if you can ³shoot your eye
out² through errors of omission with a VM system.
Can anyone point me to a source for z/VM ³Best Practices² that addresses
low level system recovery (essentially disaster recovery).
Thanks
Gary Dennis
Mantissa Corporation
Extremely useful. The limits document by by Bill Bitner and another by the
same author on performance are great resources.
If you attempted to configure a VM system with 700 active users each having
an average working set of 8GB each what kind of train wreck could that
create? All recommendations
Questions...
What is the maximum page space supported by zVM?
What is the supported real storage limit for the hardware and for VM itself?
Does anyone have experience with a zVM system having over 500 non-CMS guest
systems?
What is the highest total sustained I/O rate you have witnessed on a V
Does anyone know of a way to access very large chunks of DS8000 storage
without minidisk definitions?
We are looking for a way to allocate substantial increments of storage
(several terabytes at a time) with the least administrative overhead.
--. .- .-. -.--
Gary Dennis
Mantissa Corporation
³Twitchy² - is a squirrel and best friend of Wolf W. Wolf in Hoodwinked.
³twitchy² as used below makes me, well Twitchy.
Could you elaborate on why use of SFS via NFS ³Sort of makes the z guys
twitchy²
--. .- .-. -.--
Gary Dennis
Mantissa Corporation
On 5/1/09 7:39 AM, "Dean, David
Is there any documented APPC interface to SFS for non-CMS operating
systems?
--. .- .-. -.--
Gary Dennis
While attempting a ³Establish Device Connection² we receive a CC 2 with a
return code of x¹10¹
Anyone know what this means? The documentation is the most recent CP
programming services.
Thanks
--. .- .-. -.--
Gary Dennis
Mantissa Corporation
Only A to B as we have no broadcast requirement.
--. .- .-. -.--
Gary Dennis
Mantissa Corporation
On 4/21/09 4:08 PM, "Alan Altmark" wrote:
> On Tuesday, 04/21/2009 at 01:55 EDT, "Gary M. Dennis"
> wrote:
>
>> > The IUCV tests seemed insensitive to t
4/20/09 12:53 AM, "Alan Altmark" wrote:
> On Friday, 04/17/2009 at 12:16 EDT, "Gary M. Dennis"
> wrote:
>> IF
>> you have experience using *SIGNAL service for high volumes
>
> To my knowledge, the only exploiter of *SIGNAL is GCS, which has been u
IF
you have experience using *SIGNAL service for high volumes
THEN
Could you provide information (or simply observation) relating to
overhead, latency?
ELSEIF
You know compelling reasons this service should not be considered for
very high signal volumes
THEN
This is an e
Based on the response the assumption *seems* to be that data spaces are
being considered for the shared data. That is not the case.
I interpret the diag x'248' to mean that the source ALET can (also) be that
of the host primary address space containing the data (<=a(31 bit)).
On 4/4/09 5:34 A
'push' on write? :-)
>
> In any case, Alan is right, and the lowest latency way for virtual machin
> es
> to share data is with a DCSS.
>
> cheers, Jeff
>
>
> On Fri, 3 Apr 2009 16:47:58 -0500, Gary M. Dennis om>
> wrote:
>
>> >Something
Something along these lines
Guests pull on read
Servers pull on write
Async only
--. .- .-. -.--
Gary Dennis
Mantissa
0 ... living between the zeroes ... 0
On 4/3/09 4:26 PM, "Alan Altmark" wrote:
> On Friday, 04/03/2009 at 03:38 EDT, "Gary M. Dennis"
> wrot
sts
> and a file server of some sort?
>
> Gary M. Dennis wrote:
>> Jeff,
>>
>> What I was trying to determine if there was a way to use ZFS on OpenSolaris
>> System z as a high speed space management vehicle while bypassing
>> conventional transport layers? For
Can anyone comment on the overhead (or lack thereof) relating to use of
this diagnose.
Thanks
--. .- .-. -.--
Gary Dennis
0 ... living between the zeroes... 0
)
such that an interface in the appliance could act as a local proxy for each
guest using the service.
Regards,
Gary
--. .- .-. -.--
0 ... living between the zeroes... 0
On 4/3/09 11:29 AM, "Jeff Savit" wrote:
> "Gary M. Dennis" wrote:
>> > 1. How
r than that, you have to use SFS or BFS, and both need some work to do
> continuous availability. Minidisks won¹t work for this.
>
> On 4/1/09 5:32 PM, "Gary M. Dennis" wrote:
>
>> Is there a VM I/O management system available which will:
>>
>> 1. Supp
Is there a VM I/O management system available which will:
1. Support space allocation requests for guests on a sparse basis? The file
server needs to make the guest believe it actually has the entire allocation
while only tying up space in the pool the guest actually used.
2. Support Async I/O re
From: The IBM z/VM Operating System
>> [mailto:ib...@listserv.uark.edu] On Behalf Of Gary M. Dennis
>> Sent: Monday, March 30, 2009 7:39 AM
>> To: IBMVM@LISTSERV.UARK.EDU
>> Subject: Diagnose x'250' / z/VM I/O scheduling
>>
>> Given
>>
>>
Given
A file pool consisting of
5 VDEV files on 5 separate real devices
2 cylinders per device
4096 block size
When:
a block chain is given Diag x'250' (async) for either read or write
such that 4 blocks are written to or read from each track within
the 5 files.
Qu
On behalf of the zVos development team I want to express our thanks to the
membership of this list. Many of your discussions have helped our effort
enormously.
When I joined this list almost exactly a year ago, I did so with the
anticipation that we might need help if we got behind the curve techn
CMS Multitasking Application Programming documentation draws a distinction
between voluntary and involuntary loss of control by a thread. Blocking and
yielding in a thread are easily understood as causes for voluntary loss of
control. Preemption would appear to be just as easily understood.
Howeve
Over the last few weeks we have determined (without equivocation) that we
are z/VM communications mice. Communications men or women would have
dispatched the following problem forthwith.
What we are attempting to do is describe our connectivity requirements for
testing zVos to IBM¹s Dallas develo
What effect would this same hack have on the intended target if the x86
system being targeted was running as a guest under z/VM? Wouldn't the ill
effects be reduced by the wall between virtual guests inherent with z/VM?
On 11/4/08 11:42 AM, "David Boyes" <[EMAIL PROTECTED]> wrote:
>
>> It see
If z/VM supported virtual x86 systems, that support would make the platforms
extremely competitive and, potentially, cause a sea change in the source of
computing resource for x86.
Considering the average CPU utilization for x86 desktop systems (less than
15% by some estimates), such support could
tra processors. If
> you¹re not invoking CMS services from non-base threads then I guess that this
> won¹t be an issue for you.
>
> Mark Gillis
> Principal Software Engineer
> Tel: +61 2 8898 2678
> Fax: +61 2 8898 2600
> [EMAIL PROTECTED]
>
>
> From: The IBM z/VM
If you do not have experience with threaded CMS application development, I
suggest you read anything but the balance of of this email.
I have an application that runs under CMS and consists of three distinct
layers.
1. The top layer is some virtualized x86 OS.
2. The middle layer performs x86 to
Using VMFTP, how is the best way to transmit full volume minidisks (mixed
CMS, VSE, and z/OS) to a backup site?
--. .- .-. -.--
Gary Dennis
Alan,
Thanks. Especially for 5 through 9.
On 8/27/08 12:37 PM, "Alan Altmark" <[EMAIL PROTECTED]> wrote:
> I don't understand why you want to use temporary connections.
I don't. The original idea was to have connections for each guest active all
the time **so long as the associated overhead wou
Thanks for the response on the IUCV questions.
I have included below item 6 from the thread origin and a snippet from John
Baker's response.
Maybe I should have placed more emphasis on item 6. The server machine is
going to be updating the buffer areas in all the connected client machines.
There
Assumptions:
0. A VM server machine
1. A cluster of client virtual machines (possibly thousands)
2. n buffers are allocated for each client virtual machine
3. Each buffer contains table elements that require
(a) Element ageing
(b) Element deletion when invalidated by:
1. lack of
On 8/6/08 3:48 PM, "Alan Altmark" <[EMAIL PROTECTED]> wrote:
> Yes, there is (the PRIROUTER option), but who cares? Define the VSWITCH
> as ETHERNET (layer 2), not IP.
Does this approach get around the stack limit some way? If we try to put 800
machines on a VLAN, will this blow the limit refere
Will using VSWITCH get us around the 640 limit per OSA adapter?
--. .- .-. -.--
Gary Dennis
On 8/6/08 1:35 PM, "Mark Post" <[EMAIL PROTECTED]> wrote:
>>>> On 8/6/2008 at 2:24 PM, in message
>>>> <[EMAIL PROTECTED]>,
> "Gary M. Dennis&qu
Did I read somewhere (the "where" being a place I cannot at this point
locate) that the number of IP stacks which could be associated with a single
OSA adapter was 640? Running several thousand desktop systems on System z
is meaningful only if those operating systems can access a (the) network.
I
Can someone point me to the source of the announcement excerpt below?
--. .- .-. -.--
Gary Dennis
Mantissa Corporation
On 8/5/08 11:51 AM, "Lionel B. Dyck" <[EMAIL PROTECTED]> wrote:
>
> This is an interesting bullet in the announcement:
>
> Moving selected Linux, Windows®, and UNIX® workl
32 and 16 bit. The boot loaders used and FreeDos required incorporation of
16 bit support. Monumental pain.
We don't see 64 bit support being problematic though.
Gary
On 8/1/08 9:31 AM, "Adam Thornton" <[EMAIL PROTECTED]> wrote:
> Does z/VOS do x86_64 or just 32-bit x86? Actually, can you lis
Apologies for not responding to this thread in a more timely fashion. I had
a flood of emails after the initial post.
Speed OR Portability
Adam is closer than he knows about the approach we have taken on z/VOS.
First, he is right when he guessed "almost-certainly assembly". We have
tried both Q
9:06 AM, "Mary Anne Matyaz" <[EMAIL PROTECTED]> wrote:
> Gary, if it runs native windows, will it also then run x86 linux? That seems
> to be one of the barriers for us, that z/linux may not support certain x86
> linux
> applications.
> Thanks,
> Mary A
correct?
>
> Thanks and have a good one.
>
> DJ
> - Original Message -
> From: "Gary M. Dennis" <[EMAIL PROTECTED]>
> To: IBMVM@LISTSERV.UARK.EDU
> Subject: Re: Nice idea in blog: Should we toss x86
> architecture
> Date: Tue, 22 Jul 2008 13:02:
m your system.
>
>
> -Original Message-
>
> From: The IBM z/VM Operating System [mailto:[EMAIL PROTECTED] On
> Behalf Of Gary M. Dennis
> Sent: Tuesday, July 22, 2008 2:03 PM
> To: IBMVM@LISTSERV.UARK.EDU
> Subject: Re: Nice idea in blog: Should we toss x86 archite
he IBM z/VM Operating System
>> [mailto:[EMAIL PROTECTED] On Behalf Of Gary M. Dennis
>> Sent: Tuesday, July 22, 2008 1:03 PM
>> To: IBMVM@LISTSERV.UARK.EDU
>> Subject: Re: Nice idea in blog: Should we toss x86 architecture
>>
>> This was our post to the zd net blog.
&g
dy?
> ;-) )
>
> Regards,
> Richard Schuh
>
>
>
>> -Original Message-
>> From: The IBM z/VM Operating System
>> [mailto:[EMAIL PROTECTED] On Behalf Of Gary M. Dennis
>> Sent: Tuesday, July 22, 2008 11:03 AM
>> To: IBMVM@LISTSERV.UARK.EDU
>
This was our post to the zd net blog.
"Maybe we already have.
In Q1 2009 Mantissa will deliver a system that permits unaltered Windows
operating systems to run under z/VM. Using a desktop appliance running RDC,
users will be able to connect to their virtual Windows images running in the
VM envir
We are attempting to leverage z/VM CMS multi-tasking capabilities for
Windows® thread management.
We have substantial z/OS experience with regard to task management and
serialization so what we are experiencing in a CMS environment doesn¹t fit
what we had anticipated.
Our test was conducted on a
We need to put together something approaching a production network
environment for Windows® under z/VM testing.
We don't believe a 500 seat environment would generate any more network
traffic or for that matter be any more complex than the network definitions
for a z/VM Linux server colony.
Has a
EMAIL PROTECTED]> wrote:
> -BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
>
> Gary M. Dennis wrote:
> |
> | Our experience with z/VOS indicates that it is possible to run Intel
> | binaries efficiently on System z. However, this efficiency is not
> possible
> | with emul
On 4/10/08 10:02 AM, "David Boyes" <[EMAIL PROTECTED]> wrote:
>> You cannot run Intel binaries efficiently on System z hardware. You can run
>> Windows applications based on the portable subset of .NET (using Mono) or
>> applications which you have source code and can recompile for System z
>> h
On 3/26/08 5:05 PM, "Dave Wade" <[EMAIL PROTECTED]> wrote:
> The existing licenses already allow running in a virtual environment and
> don't specify what chips etc that could be. They could change future
> licenses, perhaps, but MS licenses don't work like Mainframe Licenses and it
> would be har
Early in the development cycle, we had both QEMU and Bochs running on
z/System version of Redhat (CentOS 5.4). The "Name two movie stars and a
dog" joke applied to both emulators running in this environment.
We concluded early on that we had to get rid of Linux and the emulation
layer. Both would
ephen Frazier" <[EMAIL PROTECTED]> wrote:
> Are you attempting to write a windows emulator that runs under VM?
>
> Looking at your companies web site it looks like you mostly sell products that
> run under z/OS.
>
> If you can do this there will be a lot of i
t; <[EMAIL PROTECTED]> wrote:
> Ummm, I may have missed something, but since when can you run Windows on
> an IBM mainframe?
>
> Peter
>
> -Original Message-
> From: The IBM z/VM Operating System [mailto:[EMAIL PROTECTED] On
> Behalf Of Gary M. Dennis
e:
> On Tuesday, 03/25/2008 at 04:26 EDT, "Gary M. Dennis"
> <[EMAIL PROTECTED]> wrote:
>
>> Is anyone aware of a VM open source file system port with some of the
>> characteristics listed below. Such a system might enable us to add the
>> functional
We need a lightweight file system to support z/VM i86 guest operating
systems. A high speed garbage can of sorts.
Is anyone aware of a VM open source file system port with some of the
characteristics listed below. Such a system might enable us to add the
functionality needed to support these guest
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