Hello,
This abend issued when the number of large frames, of the size requested,
have been exhausted and the iarv64 getstor request is cond=n either by default
or explicitly. Lfarea frames are handed out first come first serve. If by
the time your request comes through there are none left the system will abend
if it can not obtain the number needed by that request. You can use the
MODIFY AXR,IAXDMEM command to see what the large frame situation is on the
system.
Keep in mind, 1m frames are not reserved for 1m requests. If there is
need of 4k frames, available 1m frames will be broken up to feed the 4k demand.
This can result in the iaxdmem command returning values where 1meg frame in
use + available 1m frames is less that the total potential 1m frames given the
lfarea specification.
Z/OS will reform 1m frames gradually but it is not aggressive in doing
so. There was way too much overhead in being aggressive in earlier releases
of 64bit real and virtual.
________________________________
From: IBM Mainframe Discussion List <[email protected]> on behalf of
Joseph Reichman <[email protected]>
Sent: Monday, February 2, 2026 8:21 AM
To: [email protected] <[email protected]>
Subject: [EXTERNAL] ABEND DC2 reason 005D
Hi
I’m not quite understanding this error
The doc says “there were not enough large frame available in the large frame
area for backing 2G or large pages”
I have a 128 gb Zpdt machine with LFAREA=1M
The IARV64 GETSTOR command worked for a number of months
Most recently it states failing with the same number of jobs running in my
system
I I have 80 gb allocated to running Zpdt
Any insights appreciated
Thanks
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