You can use the DISPLAY VIRTSTOR,LFAREA (or D VS,LFAREA) command to see what is happening with the large frame areas. This will tell you if the 1M frames are all gone and also if some of the frames have been used to support 4K frames.
Paul -----Original Message----- From: IBM Mainframe Discussion List <[email protected]> On Behalf Of Joseph Reichman Sent: Monday, February 2, 2026 4:34 PM To: [email protected] Subject: Re: ABEND DC2 reason 005D So I I upgrade my LFAREA=1M to let’s say 3M I might have a better chance Of getting it Thanks Joe Reichman On Mon, Feb 2, 2026 at 5:31 PM Glen Garrison <[email protected] <mailto:[email protected]> > wrote: > 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] <mailto:[email protected]> > on > behalf of Joseph Reichman > <[email protected] <mailto:[email protected]> > > Sent: Monday, February 2, 2026 8:21 AM > To: [email protected] <mailto:[email protected]> <[email protected] <mailto:[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 > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, send > email to [email protected] <mailto:[email protected]> with the message: INFO IBM-MAIN > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, send > email to [email protected] <mailto:[email protected]> with the message: INFO IBM-MAIN > ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] <mailto:[email protected]> with the message: INFO IBM-MAIN ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
