Curious, do you use IAM for Hogan applications? My previous life did, and the applications group was very satisfied with the IAM performance vs. native VSAM. However, we had to impress on them, that periodic reorgs were more necessary for IAM, than under VSAM. And, we found out that ADRDSSU dump/restore of VSAM was what was being used to perform VSAM reorgs, as opposed to IDCAMS REPRO, DELETE, DEFINE, REPRO. Guess what, ADRDSSU sees an IAM dataset as extended format PS!
Sent with Proton Mail secure email. On Tuesday, April 16th, 2024 at 3:02 PM, Jousma, David <[email protected]> wrote: > Thanks for that. We do have IAM here, we’ll open a ticket with BMC asking > about support. I was just doubting since it presents to the OS as a VSAM > dataset. > > We were hoping to make ZEDC “inclusive” as in everyone gets it to reap the > space reduction, and job performance improvements and that the OS would > decide for us if a particular dataset that has the DATACLAS assigned to it > would just ignore, but that wont be the case. > > I have the ability to code ZEDC_preferred or ZEDC-Required. Required will > actually fail the allocation, which I don’t want to either, but I also don’t > want to use non-accelerated compression either. > > So, now as you pointed out, we’ll have to approach ZEDC as “exclusive” and > only opt-in file types that are supported like GDG’s for sure. We may roll > the dice on all PS, exempting temp datasets and ISPF work datasets, and more > as we stumble upon other incompatibilities. > > With knowing the technical details, I think IBM missed the boat here. ZEDC > ought to be a drop-in replacement for compression, period. I can specify > COMPACTION YES for VSAM files but ZEDC wont touch them. Why? > > Dave Jousma > Vice President | Director, Technology Engineering > > > > > > From: IBM Mainframe Discussion List [email protected] on behalf of > rpinion865 [email protected] > > Date: Tuesday, April 16, 2024 at 2:25 PM > To: [email protected] [email protected] > > Subject: Re: Anyone exploiting ZEDC? > At my previous life, we were using BMC's IAM VSAM interface. I think IAM > could use zEDC. But I was told by then IDP support, that IAM's internal > compression was Moe (as in Moe Howard) better than even zEDC. Regarding > coding for PS datasets > > > At my previous life, we were using BMC's IAM VSAM interface. I think IAM > could use zEDC. But I was told by then IDP support, that IAM's internal > compression was Moe (as in Moe Howard) better than even zEDC. > > > > Regarding coding for PS datasets opened in/out, I think DAF will show how a > PS dataset is being opened. We chose to use zEDC compression for > new,catlg,delete GDGs because we were very confident that no one was going to > process that combination as in/out. > > And does not the IBM zBNA tool highlight good candidates? We did not want to > clutter up our SMS ACS DC routines with too many actions to put certain PS > datasets into zEDC compression. But in the end, we did put certain large PS, > not opened in/out, datasets in the ACS DC routine. > > > > > > > > > > This e-mail transmission contains information that is confidential and may be > privileged. It is intended only for the addressee(s) named above. If you > receive this e-mail in error, please do not read, copy or disseminate it in > any manner. If you are not the intended recipient, any disclosure, copying, > distribution or use of the contents of this information is prohibited. Please > reply to the message immediately by informing the sender that the message was > misdirected. After replying, please erase it from your computer system. Your > assistance in correcting this error is appreciated. > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to [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
