Yea, it still needs to be formatted.   But both methods still work.

​​​​​​​​​​​​​​​​​​​​​​​​​​​​_______________________________

Dave Jousma

Vice President | Director, Technology Engineering

Fifth Third Bank | 1830 East Paris Ave, SE | Grand Rapids, MI 49546






From: IBM Mainframe Discussion List <[email protected]> on behalf of 
Mark Jacobs <[email protected]>
Date: Friday, October 24, 2025 at 12:23 PM
To: [email protected] <[email protected]>
Subject: Re: Configuring ZFS data sets

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    DEFINE CLUSTER (NAME(A2MJAET.TEST.ZFS) -

           CYL(1 1)  SHAREOPTIONS(3) LINEAR)

IGD01009I ACSMC02W DATASET HAS BEEN ALLOCATED WITH STD0 MANAGEMENT CLASS
IGD01009I MSG07    MANAGEMENT CLASS ASSIGNED STD0
IGD17070I DATA SET A2MJAET.TEST.ZFS
ALLOCATED SUCCESSFULLY WITH 1 STRIPE(S).
IGD17172I DATA SET A2MJAET.TEST.ZFS
IS ELIGIBLE FOR EXTENDED ADDRESSABILITY
IDC0508I DATA ALLOCATION STATUS FOR VOLUME ITFA1H IS 0\
IDC0512I NAME GENERATED-(D) A2MJAET.TEST.ZFS.DATA
IDC0181I STORAGECLASS USED IS S1
IDC0181I MANAGEMENTCLASS USED IS STD0
IDC0181I DATACLASS USED IS EAVSAM

IDC0001I FUNCTION COMPLETED, HIGHEST CONDITION CODE WAS 0

IDC0002I IDCAMS PROCESSING COMPLETE. MAXIMUM CONDITION CODE WAS 0

mount filesystem('A2MJAET.TEST.ZFS') mountpoint('/u/A2MJAET/mount') type(zfs)

BPXF135E RETURN CODE 00000079, REASON CODE EF016C54.  THE MOUNT FAILED FOR FILE

SYSTEM A2MJAET.TEST.ZFS.

zFS Mon Oct 28 19:01:32 EDT 2024

Description: The VSAM LDS is not formatted, is not marked as intended for zFS,

and cannot be formatted at mount.

Action: Format the VSAM LDS using the zfsadm format command and try the mount

again.



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On Friday, October 24th, 2025 at 12:13 PM, Jousma, David 
<[email protected]> wrote:

> Mark,
>
> This is not true. Just ran this today
>
> DEFINE CLUSTER(NAME(OMVSU.TEC1.DB2AAAS.SERVICE) -
> LINEAR -
> STORCLAS(SCSYSTEM) -
> MB(500) SHAREOPTIONS(3,3))
>
>
> _______________________________
>
> Dave Jousma
>
> Vice President | Director, Technology Engineering
>
> Fifth Third Bank | 1830 East Paris Ave, SE | Grand Rapids, MI 49546
>
>
>
>
>
>
> From: IBM Mainframe Discussion List [email protected] on behalf of 
> Mark Jacobs [email protected]
>
> Date: Friday, October 24, 2025 at 12:05 PM
> To: [email protected] [email protected]
>
> Subject: Re: Configuring ZFS data sets
>
> CAUTION EXTERNAL EMAIL
> This message came from outside your organization.
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>
>
>
> Using LINEAR won't work. You need to specify ZFS if you use IDCAMS to define 
> a zfs file system. Your template JCL is the older/original method of defining 
> a ZFS file system. It still works, but IDCAMS IMHO is easier.
>
> Mark Jacobs
>
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>
>
> On Friday, October 24th, 2025 at 11:46 AM, Colin Paice 
> [email protected] wrote:
>
> > I'm about to set up some new ZFS data sets
> > Is there any guidance on the best way of doing it?
> > - My DEFINE cluster has LINEAR - but I see there is a ZFS option. Does it
> > really make a difference?
> > - My template JCL has "-compat" in it. Is this recommended ?
> > Are there any performance options I should be enabling?
> > Colin
> >
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