RE: ILR006E COMMON PAGE DATA SET FULL, OVERFLOWING TO PLPA DATA SET
- From: bpellet@xxxxxxxxxxxx (Robert Pelletier)
- Date: 5 Mar 2007 08:06:38 -0800
Thanks Rob. Great explanation and thanks to all who have responded.
Have a Nice Day !
Bob Pelletier
Connecticut Student Loan Foundation
Rocky Hill, Ct.
-----Original Message-----
From: Rob Scott [mailto:rob.scott@xxxxxxxxxxxx
Sent: Monday, March 05, 2007 11:03 AM
To: IBM-MAIN@xxxxxxxxxxx
Subject: Re: ILR006E COMMON PAGE DATA SET FULL, OVERFLOWING TO PLPA DATA
SET
Bob,
The system will continue quite happily (unless you discount : possible
performance problems, the fact that all page I/O is going to the same
device, single point of failure..etc etc) until the first ASM threshold
is met (default of 70% aux storage slots in use) - after this it issues
the warning message IRA200E and the system prevents new address space
creation until the shortage is relieved.
If you meet the next ASM threashold (85% by default), you get IEA201E
which is basically saying "why haven't you sorted out the problem I
warned you about with IRA200E?".
Is it better to have 10 small page datasets or 3 large datasets eachscenario using the same amount of DASD space?
The answer is it is better to have 10 *large* local datasets (plus a
couple of spares for emergency PAGEADDs). Think of space allocation of
page datasets to be in units of "entire packs" rather than cylinders.
Once the normal workload is running, check the usage and try to keep
local page datasets below 30% - this improves the ASM I/O operations and
allows a surprise "big" job or two to want a greedy amount of nonVIO
from time to time without dimming the lights.
There is some really good help in Chapter 2 of the "z/OS Init and Tuning
Guide"
Rob Scott
Rocket Software, Inc
275 Grove Street
Newton, MA 02466
617-614-2305
rscott@xxxxxx
http://www.rs.com/portfolio/mxi_g2
-----Original Message-----
From: IBM Mainframe Discussion List [mailto:IBM-MAIN@xxxxxxxxxxxx
Behalf Of Robert Pelletier
Sent: 05 March 2007 10:46
To: IBM-MAIN@xxxxxxxxxxx
Subject: Re: ILR006E COMMON PAGE DATA SET FULL, OVERFLOWING TO PLPA DATA
SET
Question. If 5 small page datasets are at 100% and one large one is at
27% will the system hang or will it process until the 27% one is full?
Is it better to have 10 small page datasets or 3 large datasets each
scenario using the same amount of DASD space? Thanks all.
Have a Nice Day !
Bob Pelletier
Connecticut Student Loan Foundation
Rocky Hill, Ct.
-----Original Message-----
From: Glenn Siegel [mailto:glenns54@xxxxxxxxxxxx
Sent: Sunday, March 04, 2007 9:17 AM
To: IBM-MAIN@xxxxxxxxxxx
Subject: Re: ILR006E COMMON PAGE DATA SET FULL, OVERFLOWING TO PLPA DATA
SET
PAGE dataset fill up uniformly, if you have 3 page dataset, two(2) of
them 250 cylinders and one(1) of them 1000 cylinders and there is 750
cylinders of page space needed for paging the two(2) 250 ones will be at
100% and the
one(1) 1000 one will be at 25%. My guess is the 100% used page datset
are
to small. Create 2 or 3, 3000 cylinder PAGE datasets and one 200
cylinder
COMMON. Either use the PAGEADD and PAGEDELETE commands on the locals or
change IEASYSxx and IPL.
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