Sorry all, I mis-read the original statement as still talking about GDGe's.
_________________________________________________________________ Dave Jousma Manager Mainframe Engineering, Assistant Vice President david.jou...@53.com 1830 East Paris, Grand Rapids, MI 49546 MD RSCB2H p 616.653.8429 f 616.653.2717 -----Original Message----- From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] On Behalf Of Jousma, David Sent: Wednesday, December 21, 2016 2:17 PM To: IBM-MAIN@LISTSERV.UA.EDU Subject: Re: Using Extended Format as default There is currently an open APAR with GDGe causing catalog performance problems...here is a partial listing of the apar. OA50703 APAR Identifier ...... OA50703 Last Changed ........ 16/12/12 PERFORMANCE ISSUE WITH GFL REQUESTS THAT INCLUDE GDGS AT 2.2 Symptom ...... PR PERFM Status ........... OPEN Severity ................... 2 Date Closed ......... Component .......... 5695DF105 Duplicate of ........ Reported Release ......... 220 Fixed Release ............ Component Name ICF CATALOG & I Special Notice Current Target Date ..17/02/28 Flags SCP ................... Platform ............ Status Detail: DESIGN/CODE - APAR solution is being designed and coded. PE PTF List: PTF List: Parent APAR: Child APAR list: ERROR DESCRIPTION: Release 2.2 introduced GDG Extended (GDGE) functionality, which allowed for GDG bases that included more than 255 GDSs. The GFL code path was modified in such a way that when there is a GET for catalog entries for GDS's, the code path re-gets the GDG base every time a GDS is read. This applies to both regular GDGs and GDGEs. This requires more I/O, which leads to a noticeable performance impact. _________________________________________________________________ Dave Jousma Manager Mainframe Engineering, Assistant Vice President david.jou...@53.com 1830 East Paris, Grand Rapids, MI 49546 MD RSCB2H p 616.653.8429 f 616.653.2717 -----Original Message----- From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] On Behalf Of Allan Staller Sent: Tuesday, December 20, 2016 3:59 PM To: IBM-MAIN@LISTSERV.UA.EDU Subject: Re: Using Extended Format as default I can't think of any reason you should not, but allow for exceptions due to broken (usually home grown) code that has some unforeseen dependencies. PDS/PDSE and SORTWK(?) have some known restrictions. There might be a few other areas with restrictions, but in general, I think you'll do well. HTH, <snip> Is there any compelling reason why I should not (or can't) use Extended Format for all SMS managed Sequential (flat and GDG) and VSAM (KSDS, ESDS, Linear) datasets? Anything special I would need to do for Linear DB2 databases/tablespaces? </snip> ::DISCLAIMER:: ---------------------------------------------------------------------------------------------------------------------------------------------------- The contents of this e-mail and any attachment(s) are confidential and intended for the named recipient(s) only. E-mail transmission is not guaranteed to be secure or error-free as information could be intercepted, corrupted, lost, destroyed, arrive late or incomplete, or may contain viruses in transmission. The e mail and its contents (with or without referred errors) shall therefore not attach any liability on the originator or HCL or its affiliates. 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