The 5.3 documentation seems to indicate that the only DPA that counts is that
below 2G. Is that right or has the documentation simply not been brought up to
date? If it is true, it would appear to make the default SYSLIM based on the Q
FRAMES response 513876 / (4 * 2050) or 62.667 GB, assuming that I have picked
the right number for the DPA. It is a whole 'nother ball game if all DPA is to
be considered.
The second qualification, as stated below, is not well stated. For example,
defined how? Perhaps the DASD space allocated as PAGE, something that might not
be constant from one ipl to another? That is the only definition that comes to
my mind. How does one have paging space defined that is not "for CP use"? The
qualification seems to imply that it is possible.
Regards,
Richard Schuh
> -----Original Message-----
> From: The IBM z/VM Operating System
> [mailto:ib...@listserv.uark.edu] On Behalf Of Quay, Jonathan (IHG)
> Sent: Wednesday, April 07, 2010 9:42 AM
> To: IBMVM@LISTSERV.UARK.EDU
> Subject: Re: V-disk
>
> The built-in default system limit is the minimum of:
>
> * The amount of virtual storage that can be represented
> by one-quarter of the usable dynamic paging area (DPA), based
> on the fact that each gigabyte of virtual disk defined
> requires 2050 frames of host real storage
>
> * The amount of storage represented by one-quarter of the
> paging space defined for CP use
>
> -----Original Message-----
> From: The IBM z/VM Operating System
> [mailto:ib...@listserv.uark.edu] On Behalf Of Schuh, Richard
> Sent: Wednesday, April 07, 2010 11:17 AM
> To: IBMVM@LISTSERV.UARK.EDU
> Subject: Re: V-disk
>
> The question was not for a system that hosts Linux guests, it
> is for one that uses V-disk instead of T-disk for most temp
> space. The doc mentions DPA < 2G, DPA and external page
> space, but I don't see any formula for calculating the SYSLIM
> that would be the default if none were specified in the
> SYSTEM CONFIG. The current config file limits were determined
> in a galaxy far, far away at a time long, long ago. I was
> wondering how they would compare to the current system
> defaults which may well be more generous than the limits that
> have been set. The problem is, we are as close to 24X365.25
> as we can be, so it may be a long time before I can bring the
> system up without the config limits to see.
>
>
> Regards,
> Richard Schuh
>
>
>
> > -----Original Message-----
> > From: The IBM z/VM Operating System
> > [mailto:ib...@listserv.uark.edu] On Behalf Of Barton Robinson
> > Sent: Tuesday, April 06, 2010 4:49 PM
> > To: IBMVM@LISTSERV.UARK.EDU
> > Subject: Re: V-disk
> >
> > I've looked at a lot of installations using vdisk - I've only once
> > seen an installation where vdisk "seemed" to be an issue
> > - and that was when the installation had followed the 2
> vdisk for swap
> > guideline, but reversed the priority on the two disks and
> the larger
> > one was used instead of the small one.
> > So unless you've come up with a new imaginative way to use
> vdisk, use
> > "INFINITE" and use the ESAMAP report ESASTR1 to understand the cost.
> > There are many more important things to work on....
> >
> > Schuh, Richard wrote:
> > > Is there a formula that can be used to determine what the default
> > > SYSLIM for V-disks would be in the absence of any SYSTEM CONFIG
> > > definitions? If I enter QUERY FRAMES, I get this:
> > >
> > > q
> > > frames
> >
> > >
> > > All
> > > Frames:
> >
> > > Configured=38273023 Real=38273023 Usable=38273023
> > > Offline=0
> > > Pageable=37871142 NotInitialized=0
> > > GlobalClearedAvail=160
> > > LocalClearedAvail=160
> > > LocalUnclearedAvail=155
> > >
> > > Frames <
> > > 2G:
> >
> > > GlobalUnclearedAvail=56339 Pageable=513876
> > > LogicalFreeStorage=5602
> > > RealFreeStorage=5 LockedRS=497
> > > LockedCmd=0
> > > MinidiskCache=8 Nucleus/Prefix=2521 Trace=400
> > > Other=1386
> > >
> > > Frames >
> > > 2G:
> >
> > > GlobalUnclearedAvail=4046728 Pageable=37357266
> > > LogicalFreeStorage=55733
> > > RealFreeStorage=19 LockedRS=15358
> > > LockedCmd=0
> > > MinidiskCache=97600
> > > Other=320360
> > >
> > >
> > > Assuming that the dasd space is sufficient to not be a limiting
> > > factor, does this give enough information to calculate a
> > default SYSLIM?
> > >
> > > Regards,
> > > Richard Schuh
> > >
> > >
> > >
> >
>
