Re: DASD VOL1 doc

[Jim Bohnsack]

I used to have a 30 year old ?? OS manual that described the IBM format 1-5 DSCB fields.  Don't know where I put it.  Maybe it's with a S/360 Green Card or an old PofOPs manual. I found this when I did a search on IBM for VTOC. http://www.vm.ibm.com/pubs/cp31064/FMLRC.HTML it says: IBM Systems  >   System z  >   z/VM  >   Programming Interface Information: This information is NOT intended to be used as Programming Interfaces of z/VM. FMLRC Prolog Control Block Contents FMLRC DSECT Storage Layout Cross Reference FMLRC Prolog NAME : HCPFMLRC DESCRIPTION: VOLUME LABEL RECORD DSECT : FMLRC FUNCTION : MAPS THE VOLUME LABEL RECORD THAT IS READ FROM/WRITTEN TO CYLINDER 0, TRACK 0, RECORD 3. LOCATED BY : FMNFAWLR - FIELD IN HCPFMNUC CREATED BY : HCPADF (INDIRECTLY) BY USING THE FIRST LEVEL ASA TO IMBED HCPFAW INTO THE GUEST VIRTUAL STORAGE. HCPCCF (CMS MODULE). HCPFAW IS INCLUDED IN THE CPFMTXA MODULE. DELETED BY : VIRTUAL SYSTEM CLEAR.   FMLRC Control Block Content FMLRC DSECT Hex Dec Type/Val Lng Label (dup) Comments ---- ---- --------- ---- -------------- -------- 0000 0 Structure FMLRC VOLUME LABEL RECORD VOLUME LABEL RECORD - RECORD 3 ON CYLINDER 0, TRACK 0 0000 0 Character 4 FMLOSLAB OS LABEL 0004 4 Character 6 FMLCPLAB CP LABEL (ALSO KNOWN AS THE VOLID OR VOLUME IDENTIFIER) 000A 10 Bitstring 1 * CHARACTER ZERO 000B 11 Bitstring 4 FMLVTCB VTOC PTR IN R3 (CCHH) 000F 15 Bitstring 1 FMLVTCR ... (R) 0010 16 Bitstring 5 * ZEROS 0015 21 Bitstring 1 * (20) BLANKS 0029 41 Bitstring 5 * FILLER 002E 46 Character 5 FMLVLOWN VOLUME OWNER - THIS FIELD WILL CONTAIN THE CHARACTERS 'CPVOL' IF CYLINDER ZERO HAS BEEN FORMATTED FOR VM/XA CP USE. 0033 51 Bitstring 29 *   FMLRC Storage Layout *** FMLRC - VOLUME LABEL RECORD * * +---------------------------+---------------------------+ * 0 | FMLOSLAB | FMLCPLAB- | * +-------------+------+------+--------------------+------+ * 8 | -(004) |//////| FMLVTCB |:VTCR | * +-------------+------+-------------+-------------+------+ * 10 |//////////////////////////////////|////////////////////| * +----------------------------------+////////////////////| * 18 |///////////////////////////////////////////////////////| * =///////////////////////////////////////////////////////= * |//////+----------------------------------+-------------+ * 28 |//////|//////////////////////////////////| (02E)- | * +------+-------------+--------------------+-------------+ * 30 | -FMLVLOWN |//////////////////////////////////| * +--------------------+//////////////////////////////////| * 38 |///////////////////////////////////////////////////////| * =///////////////////////////////////////////////////////= * |///////////////////////////////////////////////////////| * +-------------------------------------------------------+ * 50 * *** FMLRC - VOLUME LABEL RECORD   FMLRC Cross Reference Symbol Dspl Value -------------- ---- ----- FMLCPLAB 0004 FMLOSLAB 0000 FMLVLOWN 002E FMLVTCB 000B FMLVTCR 000F This information is based on z/VM V3R1.0. Last updated on 29 Mar 2001 at 15:44:46 EDT. Copyright IBM Corporation, 1990, 2001 Tony Thigpen wrote: Anybody know where in the VM manuals the layout of the VOL1 label is documented? -- Jim Bohnsack Cornell University (972) 596-6377 home/office (972) 342-5823 cell jab...@cornell.edu