I've used ZFS since it was introduced as an option for LINEAR. With ZFS the dataset is formatted when it is mounted the first time. There is no separated step required to format the dataset before mounting, as LINEAR needed.
Matthew On Fri, 24 Oct 2025 17:41:27 +0100, Colin Paice <[email protected]> wrote: >In the past when I used linear I also had to format it with >//FORMATFS EXEC PGM=IOEAGFMT,REGION=0M,COND=(0,NE,DEFINE), >// PARM=('-aggregate COLIN.ZOPEN.ZFS ') >//* PARM=('-aggregate COLIN.ZOPEN.ZFS -compat') >//SYSPRINT DD SYSOUT=* >//STDOUT DD SYSOUT=* >//STDERR DD SYSOUT=* >Then it would mount >Are you saying the IDCAMS define .. ZFS does the format for you? >Colin > >On Fri, 24 Oct 2025 at 17:23, Mark Jacobs < >[email protected]> wrote: > >> 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. >> >> >> >> Sent from ProtonMail, Swiss-based encrypted email. >> >> GPG Public Key - >> https://api.protonmail.ch/pks/lookup?op=get&[email protected] >> >> >> 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. >> > DO NOT open attachments or click on links from unknown senders or >> unexpected emails. >> > Report Suspicioushttps:// >> us-phishalarm-ewt.proofpoint.com/EWT/v1/MwwqYLOC6b6whF7V!pHOFdhTiQyxKmg4Sp3Khl3g01dPae3MCOKFTSygwHwVMMJldFfDtH8cHbZCBsgYxyEXY-pNuyHr4hrYm0DzxrDU_kZCccsCs-rpIrbKAl8YXv-8pqDzqEs_GHBP97QbilUmeSx3JT0tI6fAM7204m2hSpfbR-6-RdL9PEUyaTTCv7jQNBsCPvNqxDlRsaBJsG5Ct_2MmfQ$ >> > >> > >> > >> > 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 >> > >> > Sent from ProtonMail, Swiss-based encrypted email. >> > >> > GPG Public Key - >> https://urldefense.com/v3/__https://api.protonmail.ch/pks/lookup?op=get&[email protected]__;!!MwwqYLOC6b6whF7V!jj7sDnkR1VbeVWs3xMbs0oaynKGHtpHNyinibMu7S8iVyZTy3_rMiz0hwgrx6hFnjmYx0qH6XXbCu6JRqw7wfPvaMi1gu72LVoc$ >> > >> > >> > 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 ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
