Yep, data class is stored in the VVDS, plain as day, right between the storage class and the management class for each dataset that has one. If it doesn't have one, there are three bytes of X'00' between the storage class and length of the management class.
First Horizon Bank Mainframe Technical Support -----Original Message----- From: IBM Mainframe Discussion List <[email protected]> On Behalf Of Jackson, Rob Sent: Tuesday, October 20, 2020 5:38 PM To: [email protected] Subject: [Originated Externally]Re: How to determine the Dataclas Used for a TAPE [External Email. Exercise caution when clicking links or opening attachments.] Are you sure? I see LM DC: on my display; that's the construct where size is defined in the Library Manager. Dataclass is definitely stored (I'd guess in the VVDS, not sure honestly, but certainly in the LM for tape volumes); check your dataset records in a DCOLLECT run . . . . D SMS,VOL(640000) CBR1180I OAM TAPE VOLUME STATUS: 022 VOLUME MEDIA STORAGE LIBRARY USE W C SOFTWARE LIBRARY TYPE GROUP NAME ATR P P ERR STAT CATEGORY 640000 MEDIA2 LITVE2F LITCL02 P N N NOERROR PRIVATE ------------------------------------------------------------------- RECORDING TECH: 36 TRACK COMPACTION: YES SPECIAL ATTRIBUTE: NONE ENTER/EJECT DATE: 2012-10-28 CREATION DATE: 2012-10-28 EXPIRATION DATE: 1999-00-00 LAST MOUNTED DATE: 2018-02-07 LAST WRITTEN DATE: 2018-02-07 SHELF LOCATION: OWNER: XPTR LM SG: LITVE2F LM SC: LITVE LM MC: MCVTSGDE LM DC: DC4GB LM CATEGORY: 000F ------------------------------------------------------------------- LOGICAL VOLUME. VOLUME IS CACHE RESIDENT. COPY EXISTS IN AT LEAST TWO DISTRIBUTED LIBRARIES. First Horizon Bank Mainframe Technical Support -----Original Message----- From: IBM Mainframe Discussion List <[email protected]> On Behalf Of Pew, Curtis G Sent: Tuesday, October 20, 2020 5:26 PM To: [email protected] Subject: Re: How to determine the Dataclas Used for a TAPE [External Email. Exercise caution when clicking links or opening attachments.] On Oct 20, 2020, at 3:00 PM, Jackson, Rob <[email protected]> wrote: > > Tape dataclass is on the volume level. You can use 'd sms,vol(vvvvvv)'. That shows the storage group but not the dataclass. I’m pretty sure DATACLAS, for both disk and tape, is used during ACS routines and allocation in general, but isn’t ever stored anywhere. It’s a place for the system to get information when allocating the dataset, but then it’s discarded. -- Pew, Curtis G [email protected] ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN Confidentiality notice: This e-mail message, including any attachments, may contain legally privileged and/or confidential information. If you are not the intended recipient(s), or the employee or agent responsible for delivery of this message to the intended recipient(s), you are hereby notified that any dissemination, distribution, or copying of this e-mail message is strictly prohibited. If you have received this message in error, please immediately notify the sender and delete this e-mail message from your computer. ---------------------------------------------------------------------- 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
