Ah, but our Linux workloads are in different LPARs, each running its own
z/VM system. Our main workload is on the system that requires the near
full-time availability of VM. It is the system that recently hosted 140
concurrent TPF guests ranging in size from a minimum of 900MB to a
maximum of 10GB. The future will see more of the sizes in the multiple
GB range as we convert systems to z/TPF. That is the VM that could
benefit from the ability to borrow storage from an unused LPAR during
peak loads and give it back in the off hours. As it is, we have two
LPARs that are reserved for native TPF testing. They are idle most of
the time and are rarely activated during the peak load periods on the VM
LPAR. They have a lot of memory that is as idle as are they.
Try as you might, you have not changed my opinion. And I am not trying
to change yours. Our circumstances, our problems, are different than
yours. I think the feature could be improved, and that I will not be
able to use it as announced. I think it is half of a solution to a
problem that we have encountered in the past and will encounter again.
Having the full solution would be very useful here. It would prevent the
need for memory upgrades by allowing us to share that memory that now
sits idle. There is a reason it sits idle, it prevents us from having to
deactivate our VM LPAR to reconfigure memory so that we can run the TPF
native LPARs. Right now, our only option is to have several GB of
storage reserved for the native LPARs.
Regards,
Richard Schuh
________________________________
From: The IBM z/VM Operating System
[mailto:[EMAIL PROTECTED] On Behalf Of Mary Anne Matyaz
Sent: Tuesday, August 05, 2008 10:25 AM
To: [email protected]
Subject: Re: ADD VIRTUAL MEMORY DYNAMICALLY
Uh, I've never seen Linux use LESS memory. It always wants more.
:) I'm happy
with the ability to add memory.
MA
On Tue, Aug 5, 2008 at 12:58 PM, Schuh, Richard
<[EMAIL PROTECTED]> wrote:
Yes, it can add, but not subtract without LPAR
deactivation. Let me know
when the ability to dynamically remove previously added
storage is
available, and I will be more enthusiastic.
Regards,
Richard Schuh
> -----Original Message-----
> From: The IBM z/VM Operating System
> [mailto:[EMAIL PROTECTED] On Behalf Of Bill
Holder
> Sent: Tuesday, August 05, 2008 9:09 AM
> To: [email protected]
> Subject: Re: ADD VIRTUAL MEMORY DYNAMICALLY
>
> On Tue, 29 Jul 2008 16:17:15 -0500, Bill Holder
> <[EMAIL PROTECTED]> wrot=
> e:
>
> >To address the question of adding Linux real memory
dynamically:
> >
> >The z/Linux support for dynamic addition of real
memory has been
> >provide=
> d to
> >the open source community fairly recently. (I don't
know the exact
> >date.=
> )
> >When that support becomes generally available is up
to the
> open source
> >community and the commercial distributors of Linux.
> >
> >There is no support for dynamically adding real
memory to
> z/VM itself
> >or=
>
> >dynamically increasing the "guest real" memory (that
is, "DEF STOR"
> >memory) for guest of z/VM in any announced release of
z/VM.
> >
> >- Bill Holder
> > z/VM Development, IBM
> >=========================
> ==========================
> =======================
>
> As of this morning's announcement of z/VM 5.4.0, z/VM
support
> for dynamic addition of storage to z/VM itself, as
well as
> dynamic addition and removal of storage to/from z/VM
guests
> (if supported by the guest operating system) is now
announced.
>
> - Bill Holder
> z/VM Development, IBM
>
