As far as I know JES2 holds proclibs open normally. There may be a way to get 
it to close and re-open them.
JES2 runs with the NDSI bit set in the PPT. Hence it does not issue ENQs for 
any datasets it allocates.
Lennie

-----Original Message-----
From: IBM Mainframe Discussion List <[email protected]> On Behalf Of 
Paul Gilmartin
Sent: 12 June 2024 12:59
To: [email protected]
Subject: Re: PDS compress and PROCLIB

On Wed, 12 Jun 2024 08:55:56 +0000, Lennie Bradshaw  wrote:

>I believe JES2 read the proclibs without data integrity (i.e. no ENQs are 
>issued for the libraries). ...
>
Why!?  Is PDSE a solution?  IEB COPY with DISP=SHR?

We had a developer-facing local PROCLIB catenand.  I routinely updated a member 
in background using ISPF EDIT ENQs.
Once I found another developer's content in "my" member.  She had courteously 
signed it.  She explained that she had updated her member from a test system 
sharing DASD.  Admin explained that MIM had crashed on that system at that time.

MIM isn't fail-safe.  But the price of fail-safe might be inability to IPL 
before MIM activates.

--
gil

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