Re: "SYSMDUMP can be blocked. But if it is going to be blocked, RECFM must be FBS."
Can you share where that may be documented? The V2.5 JCL Reference (SA23-1385-50) has only this advice concerning SYSMDUMP: SYSMDUMP DD statement Produces a dump of the system areas and the program’s address space. The dump is unformatted and machine-readable. It must be processed by the interactive problem control system (IPCS) and therefore should not be directed to SYSOUT. z/OS R6 introduced system-determined BLKSIZE support for SYSMDUMPs. If you wish to control the BLKSIZE for compatibility with tools developed for earlier releases, add the following DCB attributes to your SYSMDUMP DD statement. DCB=RECFM=FB,LRECL=4160,BLKSIZE=4160 Peter -----Original Message----- From: IBM Mainframe Discussion List <[email protected]> On Behalf Of Tom Marchant Sent: Wednesday, May 24, 2023 2:46 PM To: [email protected] Subject: Re: Why does ISPF BROWSE abend with S878 searching a large sequential file? On Wed, 24 May 2023 11:35:19 -0400, Steve Thompson <[email protected]> wrote: >RECFM=F,LRECL=4160,BLKSIZE=0 (I think blocking works with dumps now) Yes SYSMDUMP can be blocked. But if it is going to be blocked, RECFM must be FBS. RECFM=F will be unblocked. >And SPACE=(CYL,100,30) I think that should be able to hold the >whole dump. Why such a small secondary allocation? That is a pretty small allocation for a SYSMDUMP, though it may be adequate for the OP's region size. When I create a SYSMDUMP in batch, and I do it several times a year,, I code (CYL,(300,500),RLSE). DCB parameters need not be specified, as they will be filled in properly by the system. -- This message and any attachments are intended only for the use of the addressee and may contain information that is privileged and confidential. If the reader of the message is not the intended recipient or an authorized representative of the intended recipient, you are hereby notified that any dissemination of this communication is strictly prohibited. If you have received this communication in error, please notify us immediately by e-mail and delete the message and any attachments from your system. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
