Jake,
Have you reviewed the sizes for TIOT in the Init and Tuning Manual?
TIOT
Specifies the installation defaults for the task I/O table (TIOT).
SIZE(nn)
Specifies the size of the TIOT. The TIOT contains an entry for each DD
statement. The size of the TIOT controls how many DDs are allowed per jobstep.
By specifying an integer from 16 to 64 as the value of this parameter, the
installation controls the default DD allowance. Table 1 shows the relationship
between the size of the TIOT and the maximum number of DDs allowed.
Table 1. Relationship size of TIOT and maximum number of DDs allowed
Dec Hex Size of TIOT Maximum number of Maximum number
of DDs allowed when every
single unit DD Allowed DD requests the
maximum number of units (59)
16 10 16384 (16K) 816
64
17 11 17408 (17K) 867
68
24 18 24576 (24K) 1225
97
25 19 25600 (25K) 1277
101
32 20 32768 (32K) 1635
129
40 28 40960 (40K) 2045
162
48 30 49152 (48K) 2454
194
56 38 57344 (56K) 2864
227
64 40 65536 (64K) 3273
259
It looks better in this link
https://www.ibm.com/support/knowledgecenter/SSLTBW_2.1.0/com.ibm.zos.v2r1.ieae200/alstate.htm
There are some examples to show you how things are calculated. But remember,
YMMV.
Also, if you do any internet searches, you will probably come across this link
https://groups.google.com/forum/#!topic/bit.listserv.ibm-main/5iizAoUCURc
Lizette
> -----Original Message-----
> From: Lizette Koehler [mailto:[email protected]]
> Sent: Tuesday, June 21, 2016 6:26 AM
> To: 'IBM Mainframe Discussion List' <[email protected]>
> Subject: RE: TIOT exceeded
>
> If you did not set the TIOT in ALLOCxx to the max (64K) then you will probably
> run out of TIOT sooner than someone who does.
>
>
>
> If you have SDSF, check the Health Checker function - Look for TIOT in the
> list. See what it says.
>
> You can enter SB next to the HC functions for more details.
>
> It might help.
>
> I would just expect the system to calculate things for TIOT correctly. If you
> feel this is in error, you should open an SR with IBM and have them assist
> you. They will probably need dumps or traces to determine why it fails.
>
> Lizette
>
>
> > -----Original Message-----
> > From: IBM Mainframe Discussion List [mailto:[email protected]]
> > On Behalf Of Jake Anderson
> > Sent: Monday, June 20, 2016 10:43 PM
> > To: [email protected]
> > Subject: Re: TIOT exceeded
> >
> > Hi Lizette
> >
> > Apology to ask
> >
> > I am not still able to understand the calculation of TIOT usage in my case.
> >
> > It was just 1027 GDG members spanning across multiple volume.
> >
> > So how did it exhaust the TIOT ? Is there a formula that would help me
> > to determine?
> >
> > Jake
> > On Jun 21, 2016 3:23 AM, "Lizette Koehler" <[email protected]> wrote:
> >
> > > Why not run with TIOT set to 64K? I know a lot of shops that have
> > > set that to the maximum of 64K
> > >
> > > Lizette
> > >
> > >
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